E-mail: secretary@worldmaterialsconference.com | USA : +1-646-828-7579, UK : +44-203-695-1242 | August 24-26, 2017, Barcelona, Spain  


Materials Science and Engineering
Mining and Metallurgy
Nano sciences and nanotechnologies
Nanomaterials and Nanocomposites

Session Introduction

Manuel de Llano
Instituto de Investigaciones en Materiales, UNAM, Mexico

Biography: Published textbook Mecánica Cuántica (now in its 3rd edition, 2015); first and second editions sold over 2,000 copies. Also, published over 230 research papers having more than 1,000 citations [including papers with G.A. Baker, Jr. (Los Alamos), J. W. Clark (Washington U.), H. Feshbach (MIT), E.H. Lieb (Princeton), W.C. Stwalley (UConn) and V.V. Tolmachev (Moscow)]. Supervised 45 thesis (10 doctoral, 22 master’s and 13 undergraduate). Co-founder in São Paulo, Brazil of International Workshops in Condensed-Matter Theories held annually in every continent of the globe since 1977, its proceedings published yearly since 1985 by Plenum Press, then Nova in New York and finally World Scientific in Singapore.

Abstract: The generalized Bose-Einstein condensation (GBEC) formalism [1-4] of superconducting charge carriers hinges on three separate new ingredients, it: a) treats Cooper pairs (CPs) as actual bosons which are distinct from BCS pairs which strictly speaking are not bosons, b) includes two-hole pairs on an equal footing with two-electron ones, and c) naturally incorporates in the resulting ternary ideal boson-fermion (BF) gas BF vertex interactions that drive formation/disintegration processes of CPs. It thus generalizes (and, indeed, includes as a special case) the T.D. Lee and Friedberg 1989 BEC theory of cuprate superconductors where, however, no explicit mention of two-hole pairs is even ever made. Besides also subsuming both BCS and BEC theories precisely (via the well-known BCS-Bose crossover picture, also subsumed) the GBEC formalism leads to several-order-of-magnitude enhancements in the critical superconducting temperature Tc. (We replace the widely familiar “BCS-BEC" crossover designation more generally by using "BCS-Bose" instead as the crossover also applies in 1D [5] where BEC is not possible.)

Anke Ehbrecht
Karlsruhe Institute of Technology (KIT), Germany
Title: Influencing factors onto the crystallization of phosphorus compounds by means of Calcium-Silicate-Hydrate with respect to P-RoC-technology

Biography: Anke Ehbrecht studied Geoecology at the Technical University of Karlsruhe. Since 2007 she is head of the department « Environmental Technology » at the Competence Center of Material Moisture (CMM). CMM is an institution of the Karlsruhe Institute of Technology, which is working on moisture induced processes of materials.

Abstract: Phosphorus plays a significant role within biochemical processes. Since no other element can substitute phosphorus,i it is an essential nutrient for all live formsii. Therefore, phosphorus is a major component of fertilizers.iii Phosphorus is mainly obtained from mined rock phosphate in igneous and sedimentary depositsiv.Depleting these deposits in order to meet the increasing demand of fertilizers due to increasing global population will lead to a phosphorus scarcity within the next 80 to 385 yearsv,vi,vii. This situation led to intensified research on P-recovery during the last decadesviii,ix and it has been found that wastewater treatment plants (WWTP) represent an important phosphate sinkx. Therefore, numerous procedures have been invented in order to recover phosphorus from sewage. One of these procedures is the P-RoC-technology (P-recovery by crystallization) which was developed and patented by the Karlsruhe Institute of Technology (KIT). The P-RoC-procedure is an admitted method, which proved its functionality in several semi-technical experiments and two pilot plants at two WWTP´s in Southern Germany. In P-RoC-technology, P-recovery occurs in one singular step without the addition of chemicals except for the reactive substratexi, i.e. no precipitant is required, and the obtained product can be dewatered easily and used as a fertilizer without any further conditioningxii. The present study investigated the interaction of the crucial P-RoC components with the CSH-material regarding both the fluid and the solid phase. It has been found, that humic substances have two starting points to influence the P-RoC procedure a) calcium cations are complexed and b) the pH value decreases. Both occurrences inhibit P-RoC-procedure. Furthermore, the present study revealed P-RoC-process as a whole. At the beginning, dissolution processes are taking place, which is attended by increasing pH value as well as increasing silicium concentration in the effluent. The release of OH-anions are necessary to form hydroxyapatite. The processes within and onto the CSH grains are properly proofed by increasing SSA, XRD and ESEM recordings.

Giovanni Maizza
Politecnico di Torino, Italy
Title: Contact Multiphysics in Spark Plasma Sintering: a New Science to Develop Advanced Materials by Design

Biography: Professor Giovanni Maizza (M.S. in Mechanical Engineering and Ph.D. in Metallurgy Engineering) is Director of the Center for Multiphysics Materials and Process Design at department of Applied Science and Technology of Politecnico di Torino (Institute of Technology). His main expertise lies in the development of combined experimental-multiphysics modeling methodologies to design, develop or rapidly setup ultrafast highenergy- density processes while tailoring the desired materials microstructure and properties for specified structural applications. His research also covers the design and development of testing prototype facilities simulating wear-impact, multifieldassisted tensile and macro-indentation tests, small-punch, etc. He has published more than 80 peer reviewed publications, has organized International workshops on processing, nanomaterials, and nanodevices and has chaired IAA conference sessions on materials processing under high gravity conditions. He serves as a reviewer to several International journals in the fields of metals, ceramics and materials processing.

Abstract: Multiphysics contacts in SPS systems are special interfaces between two conducting surfaces ensuring the passage of electric currents and/or heat flow across them. They can be of two types, namely microscopic (particle scale) and macroscopic (device scale). The latter are found between the tooling elements (electrode, punch and die) and the powder or compact. If the contacting surfaces are assumed smooth and there are no foreign films interposed between them, the contact resistance depends (Holm’s law) on the electrical resistivity of the contacting materials and the radius of the contact area (constriction effect). The applied external pressure is the primary factor controlling the complex role of contact resistances during SPS. The lower the imposed pressure, the higher will be both the electric contact resistance and the heat dissipated at the contacts. The latter promotes bonding and densification between particles. However, pressure must be tuned with care. Too low pressure values may cause contact overheating or disruptive sparks whereas too high values may result in unsatisfactory powder sintering due to low heat dissipation. Besides, high contact temperatures are responsible of marked local stressstrain field which, in turn, affect the local contact resistances in a complex manner. Therefore, to properly control the SPS process and microstructure evolution during sintering, an adequate understanding of the multiphysics phenomena at the micro/macro contact interfaces is demanded. The aim of this work is to present a comprehensive and systematic examination of contact multiphysics phenomena in SPS systems by coupling experimental and computer modeling approaches in the case of a mixture of coarse WC and low melting Ni-alloy powders. Experiments employ ultrafast optical pyrometry and a consumable optical fiber to permit in-situ monitoring of the SPS phenomena during an intermediate stage of sintering. The Ni-alloy particles are used for aiding track of contact phenomena between particles involving liquid phase over and diffusion phenomena through WC particles. Computer modeling is developed and examined at three different scales of contact, namely device, mesoscopic (e.g., aggregate of particles) and one single contact (particle-couple). It is found that contact multiphysics is a powerful approach not only to elucidate SPS phenomena but also to fabricate new advanced materials by design.

Taurino Rosa
Università degli Studi di Parma, Italy
Title: Physical-mechanical properties of PVC/Chitosan composites

Biography: Dr. Taurino Rosa took his Degree in Engineering of Materials in 2005 with a research final year project on the “Development and Characterization of perfluoropolyether hybrids coatings for glass substrates”. In 2008 took the PhD in Nanotechnology at the University of Perugia doing research on the development of Organic-Inorganic hybrid materials by sol-gel process. Her activity is focused on different aspects of the material and environmental science, with particular relief on the valorization of waste in material engineering (new materials and new technologies). She is co-author of more than 28 papers which have been published in international and national scientific journals and she has presented her works at national and international Congresses.

Abstract: PVC is one of the most commonly used synthetic polymers in biomedical applications, especially as a catheter material for the circulatory system [1]. However, microbial colonization of medical device surfaces and the subsequent biofilm formation represents one of the most serious issues in healthcare-associated infection [2]. For this reason, during the last decade, there was an increasing interest in developing PVC-based materials with self-sterilizing and antibacterial properties. A great effort was thus turned to find natural antibacterial molecules or materials that could be easily incorporated in the polymeric matrix by the common techniques. Natural polymer such as chitosan offers real potential due to its physico-chemical properties, short time biodegradability, biocompatibility with human tissues, antimicrobial and antifungal activities, and non-toxicity. Chitosan exhibits high antimicrobial activity against pathogenic and spoilage micro-organisms, including fungi, and both Gram-positive and Gram-negative bacteria. [3]. Then, since sustainable chemistry and engineering require the development of materials and technologies based on natural polymers, this research investigates the role played by chitosan as additive for active PVC-based composites obtained by thermo-mechanical process. Subsequently, mechanical, thermal, structural and antibacterial properties were examined. The results showed as a small amount of chitosan content caused a significant decrease in the failure strain and increase in the tensile modulus. The storage modulus, and loss modulus increased with addition of chitosan, confirming a good interaction chitosan-PVC in agreement with the results of tensile testing, morphology study and FT-IR. Infact, no debonding was observed between chitosan particles and PVC matrix, as evident in the SEM of the fractured surfaces. Moreover, the composites showed a good antimicrobial activity inhibiting, in particular, the growth of S.aureus. Considering the obtained preliminary results chitosan seems to be highly promising as filler for PVC-based composites prepared by thermo-mechanical process that could be useful to avoid the formation of biofilm on plastic material.

Jun Liu
Shenyang Ligong University, China
Title: Effect of basic composition on the hydration heat evolution of magnesium phosphate cement (MPC)

Biography: Jun Liu, Professor, Doctoral tutor, President of Shenyang Ligong University. ‘National Millions of Talents Project’ 100-person level candidates; Young expert for national outstanding contributions; National Education Ministry of inorganic non-metallic materials, the Steering Committee of the professional; Government special allowance recipients; Vice chairman of China Silicate Society cement Specialized Committee.

Abstract: Magnesium phosphate cements (MPCs), known as chemically bonded ceramics, mainly include dead-burnt magnesia, water-soluble phosphate and retarder, generally boric acid or borax. Such a kind of materials are potential cementitious materials used for quick repair and reinforcement of structures due to their outstanding properties such as fast setting and hardening, high strength with low permeability, good volume stability and durability. Thereinto, setting and hardening time correspond to the hydration process of MPCs, which are of great importance to their workability. Therefore, it is of crucial significance to study the hydration process of MPC. In addition, the hydration process of the MPCs maybe affected by many factors, especially by their composition. In order to improve the workability of MPC, the effect of composition (namely borax and magnesia to phosphate ratio)on the hydration properties of the MPC were investigated through calorimetric method, then the heat flow and heat of samples with varied mixture are determined. The results show that MPC sets rapidly with less than 8% of borax, which is unfavorable to the construction of MPC. Adding more than 8% of borax results in a secondary hydration for MPC, and can be divided into five processes, namely, preinduction period, induction period, acceleration period, deceleration period and stable period, which are analogous to those of ordinary Portland cements. In addition, induction period and the subsequent periods curves shift to the right with increased borax content, while rising the addition of M/P(magnesia to phosphate ratio by molar) results in the invert trend. With the elevated M/P from 3/1 to 4/1, the heat flow increases significantly but varies slightly in the range of 5/1 to 6/1.The effect of M/P and borax on the hydration mechanism mainly depends on the relative magnesia and borax amount by weight. Hence, adding proper addition of magnesia and borax can contribute to improve the workability of the MPC and thus better construction quality.

Marc Milesi
Umicore Building Products, France
Title: Whitening Limit Diagram of the zinc sheet phosphate coating


Abstract: This paper focuses on the importance of taking into account the acceptable whitening limit of the protective coating of metals after forming processes. Coating aspects are essential for validating final products, especially if the coating has a design feature. The material studied is a standard zinc used in the building industry with a phosphate coating offering a range of different colors such as black, grey and a panel of blue, red, brown and green. These colors define a real differentiation but during sheet metal forming, the coating is deformed with a high level of stresses, ending up to the coating deterioration and to the whitening effect. The problem becomes more important than the forming limit before metal failure. The model developed in this article present an adapted criterion, based on forming limit diagram (FLD), and called whitening limit diagram (WLD), totally innovative to the best of the author’s knowledge. The WLD has been extended to develop a stress-based criterion called whitening limit stress diagram (WLSD). The black color (called anthra zinc) has been investigated to define the model by considering the behavior of the coating by nano-indentation and define a specific criterion based on digital image correlation and colorimetric analyses.

Sung-Gyu Park
Korea Institute of Materials Science, Korea
Title: Plasmonic Hybrid Nanomaterials for Surface-Enhanced Raman Spectroscopy

Biography: Dr. Sung-Gyu Park is the author of one book chapter, more than 50 peer-reviewed articles, and more than 20 inventions. His research interests include localized surface plasmon resonance, nanofabrication, surface-enhanced Raman spectroscopy, holographic lithography, 3D nanopatterning, photonic crystals, and microfluidics. He was a recipient of the Presidential Award for Honor Student in 2003, Best Poster Award at 10th U.S.-Korea Forum on Nanotechnology in 2013, and Young Innovative Researcher at NANO KOREA 2016.

Abstract: Nanogaps generated at junctions between plasmonic nanomaterials enable the highly-sensitive molecule detection of surface-enhanced Raman spectroscopy (SERS) sensors. The strong near-field interactions between the plasmonic nanostructures create an enhanced near-field due to the generation of gap plasmons. Here, we propose a simple method, using non-lithographic processes, to create large-area 3D plasmonic nanomaterials by decorating a nanoscale-thick dielectric interlayer deposited onto 3D-stacked Ag nanowires with an ultrahigh number of Ag nanoparticles. The hybrid 3D plasmonic nanostructures led to near-perfect absorption and ultrasensitive SERS detection. Ultrasensitive SERS sensing applications are enabled by the strong plasmonic coupling between the ultrahigh populations of plasmonic nanostructures. We also investigated the analyte-concentrating effects of 3D SERS substrates that displayed superhydrophobicity toward aqueous solutions and the coffee ring effect toward organic solutions in an effort to develop highly sensitive SERS-based chemical sensors.

Catherine Schwob
University Pierre and Marie Curie, France
Title: Nano Science and Nanotechnology session Imprinted polymer inverse opals for the detection of nanoparticles

Biography: Catherine Schwob is professor in physics at University Pierre and Marie Curie in Paris, France. She makes her research activities in the Institut des NanoSciences de Paris in the field of nanophotonics. She studies the coupling of nano-emitters with photonic/plasmonic media. Recently, she has developed an activity on the synthesis of self-assembled photonic crystals and on their use in sensing applications for the detection of nanoparticles or chemical pollutants.

Abstract: Because of their small size, nanoparticles present specific properties and are extensively present in our everyday life. They are used in many industrial fields (paintings, cosmetics, food industry). Toxicity and especially eco-toxicity of these particles are not well-known yet and further data on their impact on human health and on the environment are absolutely needed. Nevertheless, effects such as airway inflammation or disruption of neuronal functions have been established by experiments on animals. Consequently, the development of sensitive devices for measuring exposure to nanoparticles with selective recognition and size measurement is absolutely needed. Fig. 1: SEM image of the surface of a polymer inverse opal The sensor of nanoparticles we have developed combines the concepts of imprinted polymer – commonly used in the case of molecules[1,2]- and of photonic crystal. More precisely, it consists in a nanoparticle-imprinted polymer inverse opal. The selectivity is ensured by the fact that the target nanoparticle is imprinted in the material composing the sensor[3]. The signature of the nanoparticle consists in the swelling of the polymer, which leads to a modification of the photonic crystal periodicity, measured by reflection spectroscopy. As a proof of concept, we have synthetized a sensor of colloidal nanocrystals. This device presents high performances in terms of sensitivity, specificity and selectivity in size and surface chemistry.

Takahiko NAKAOKI
Ryukoku University, Japan
Title: Phase Structure for Highly Drawn Ultrahigh Molecular Weight Polyethylene investigated by Solid-state High Resolution 13C NMR

Biography: Takahiko NAKAOKI has completed his PhD from Osaka University (Japan) in 1992. He is Professror at Ryukoku University, Japan. He had been the director of The Society of Polymer Science, Kansai branch. He has published more than 60 papers in international journals.

Abstract: Temperature dependence on the phase structure was investigated for drawn and undrawn ultrahigh molecular weight polyethylene (UHMWPE) by solid-state high resolution 13C NMR. The fully relaxed DD/MAS 13C NMR spectra provided the fractions of crystalline, interphase, and amorphous, and the analysis on molecular mobility by spin-lattice relaxation time provided three components in the orthorhombic phase, two components in the monoclinic phase and a single component in the interphase and amorphous phase, respectively. The molecular mobility of orthorhombic phase for drawn UHMWPE was the lowest of three samples, corresponding to the most rigid. This closely relates with good mechanical properties for drawn UHMWPE. The T1C was as high as 2040 s even at 100 °C for drawn UHMWPE. With increasing temperature, a part of the most mobile chain in the orthorhombic phase which locates at the lamellar surface transforms to that in the interphase, and then the interphase also transforms to the amorphous. The drawn UHMWPE had high fraction of the monoclinic phase and lattice defect which are induced by highly drawing. These fractions decreased with increasing temperature. So the monoclinic phase exists as a defect in the orthorhombic phase, and the molecular chain corresponding to the lattice defect would connect the monoclinic and orthorhombic phases. The monoclinic phase transforms to the orthorhombic phase with increasing temperature. This resulted in the small fractional decrement of orthorhombic phase.

Yuzuru Miyazaki
Tohoku University, Japan
Title: Enhanced thermoelectric performance in partially substituted melt grown higher manganese silicides

Biography: Yuzuru Miyazaki has completed his PhD from Department of Materials Science, Tohoku University, Japan and postdoctoral studies from School of Chemistry, University of Birmingham, UK. He is a full professor at Department of Applied Physics, Tohoku University. He has discovered more than 30 inorganic compounds, in the fields of high-Tc superconductors and thermoelectric materials, including oxycarbonate cuprates, infinite-layered cuprate and misfit-layered cobaltates. He has published more than 100 research papers in international journals.

Abstract: Higher manganese silicides, HMSs, possess a (3+1)-dimensional composite crystal structure, consisting of two tetragonal subsystems (sublattices) of [Mn] and [Si], with an identical a-axis length but different c-axis lengths. Using the c-axis ratio γ = cMn/cSi, the chemical formula of the compounds can be represented as MnSiγ. Pristine HMSs prepared from a liquidus state generally contain layered precipitates of MnSi, which deteriorate electric conduction and thus lower TE power factor. To obtain better TE performance, optimisation of the power factor and dissipation of layered precipitates are prerequisite, while maintaining materials cost as low as possible. We have prepared solid solutions of (Mn1-xMx)Siγ (M = Cr, V, Fe, Co, etc.) and confirmed that the substitution of 1-2 at% of V for the Mn sites significantly suppresses the formation of MnSi precipitates. Apart from the improvement on microstructures, the partial substitution of such an element increases the number of hole carriers. Temperature dependence of the Seebeck coefficient S and electrical conductivity σ of the V-system exhibits metallic behaviour up to around 900 K. However, the increase in σ is relatively larger than the decrease in S. As a result, the highest TE power factor of 2.3 mW/K2m (x = 0.02, @800 K) has been achieved, which is roughly 130% higher than that of the V-free sample of 1.1 mW/K2m (@610 K). This work is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

Yuta Saito
National Institute of Advanced Industrial Science and Technology (AIST), Japan
Title: Topological insulator heterostructures:electronic structure simulation and growth by sputtering

Biography: Yuta Saito was born in Japan. He received his Ph.D. degree from Tohoku University Japan in 2013. After he got his Ph.D. degree, he moved to National Institute of Advanced Industrial Science and Technology in Japan. Currently he is a visiting researcher in the University of Cambridge in UK. His research topic includes the growth of chalcogenide filmsfor electronic device applications and first principle simulations using density functional theory.

Abstract: GeTe/Sb2Te3 chalcogenide heterostructure have been proposed for use as future non-volatile memory application, and have exhibitedsignificantly lower power operation with faster switching speed compared to Ge-Sb-Te composite materials [1]. Furthermore, unusual magnetic properties have also been reported, which are not observed in composite materials. They are attributed to an interface between a normal insulator of GeTe anda topological insulator of Sb2Te3 layer.In order to realize these materials for industry, growth technique is particularly important and one of the most widely used methods in semiconductor industry is sputtering. In this talk, we discuss the growth mechanism of atomically aligned highly-oriented chalcogenide heterostructures fabricated by sputtering. We also reveal the electronic structures of these heterostructures by means of ab initio density functional theory simulation. These findings will be useful not only for non-volatile memory production but also for developing novel electronic devices using topological insulating features.

Monica Baia
Babeş-Bolyai University, Romania
Title: Ionic strength upon the structure and morphology of WO3 semiconductors. Study of WO3 and WO3-TiO2 composites photoactivity

Biography: Monica Baia studied physics at Babes-Bolyai University (BBU) of Cluj-Napoca and obtained her Ph.D. (2003) at University of Würzburg. In 2003 she began her academic career at BBU. Between 10.2005 - 06.2006 she was Postdoc at University of Jena. In 2007 she received the In Hoc Signo Vinces Prize. Her research is focused on the elucidation of the structure and adsorption behavior of pharmaceuticals by Raman spectroscopy and SERS; the study of optical/structural properties of metallic nanostructures used as SERS-substrates, and the development and application of nano-materials for wastewater treatment via photocatalysis. She is author/coauthor of over 85 publications and 3 books.

Abstract: Nowadays, water treatment is an important challenge. There are several methods that can be used for this purpose: physical, biological or chemical methods, but these are either expensive or less efficient. To overcome this issue an alternative technology, heterogeneous photocatalysis can be a solution. The advantages of the WO3 photocatalysts are that it can be synthesized relatively easy and it does not dissolve in water; it absorbs both UV and visible light (its color can vary from yellow, green to blue and white/grey) at a much broader range (broader action spectrum) compared to TiO2. Also, its band gap is lower compared to TiO2; meaning that WO3 requires less energy to be active in the heterogeneous photocatalytic processes. The disadvantage of the WO3 is that shows only limited activity as a photocatalyst in comparison with TiO2. In this present work, a traditional semiconductor (WO3) was synthesized from a precursor (sodium tungstate dihydrate) via hydrothermal crystallization aiming the production of nanorod-like shaped crystals. The as synthesized tungsten trioxide nanocrystals were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS). With the help of these methods was obtained a thorough analysis of the crystals morphology and structural properties. Concerning the synthesized WO3 semiconductors’ photocatalytic activity towards dye removal (methyl orange – MO) it should be mentioned, that they show no photoactivity regarding MO removal. Composite systems (WO3-TiO2) were prepared via physical mixing from the synthesized WO3’s and the commercially available TiO2 (Evonik Aeroxide P25). The photocatalytic efficiency of these systems was determined by monitoring the MO dye (C0 = 125 µm) removal under UV light irradiation.

Pal Mangat
Sheffield Hallam University, England

Biography: Professor Pal Mangat is a chartered civil and structural engineer. He received his PhD degree from Sheffield University and was a senior lecturer in the Department of Engineering at Aberdeen University. He was appointed Professor of Construction Materials at Sheffield Hallam University in 1993. He has published over 100 peer reviewed publications on many novel aspects of concrete materials including accelerated curing of concrete, cement replacement materials, fibre reinforced concrete, marine durability of concrete and alkali activated cementitious materials.

Abstract: This paper reports an investigation on the size and distribution of capillary and gel pores in an alkali activated cementitious (AACM) mortar and comparative OPC mortar. These pore properties were determined from the cumulative and differential pore volume curves obtained by mercury intrusion porosimetry (MIP). The classification and distribution of these pores provides a useful insight to the properties of hardened concrete such as the durability, fire resistance and mechanical properties. The results show that AACM mortar mixes possess a bimodial pore size distribution while OPC concrete has unimodial pore sizes distribution. The intrudable porosity is lesser in AACM mortar than OPC mortar. The volume of the capillary pores was higher in AACM mortar compared with OPC mortar. However, the volume of the gel pores was much lower in AACM mortar than OPC mortar. The distribution of bimodal pores in AACM mortar is greatly influenced by the effects of curing type and the activator dilution. The distribution of unimodal pores in OPC mortar is similarly influenced by the curing type.

Renato Pero
Università di Roma "Tor Vergata", Italy
Title: Direct Measurement of Tensile-Like Properties by Vickers Depth Sensing Test of Solid-State Aluminum-alloy Welded Joints

Biography: MS Eng. Renato Pero (Ph.D. Student) Bachelor and Master of Science degrees in Materials Engineering achieved at Politecnico di Torino. M.Sc. thesis title: "Work Hardening and Dynamic Recrystallization in Aluminum Alloys" Current position: Ph.D. student in Industrial Engineering (Metallurgy) at University of Rome "Tor Vergata" in collaboration with the Center of Modeling and Design of Materials and Processes (DISAT - Politecnico di Torino). Field of study: Development of experimental and modeling methodologies to study recrystallization in aluminum alloys.

Abstract: The mechanical characterization of the solid state welded joints (e.g. by means of friction stir welding) of high-strength aluminum alloys is of scientific and industrial relevance such as in transportation and machinery applications. Solid-state welded joints are frequently composed of several regions with different microstructures and mechanical properties. On heating the welding zone typically undergoes recrystallization (severe softening and grain refinement) and dissolution of existing precipitates. The subsequent rapid cooling is responsible of re-precipitation over a "frozen" refined microstructure. It is often observed that the latter phenomena may help recover to some extent the severe drop of the mechanical properties across the joint caused by recrystallization on heating. It is, therefore, of crucial engineering importance to assess whether the mechanical properties of the solid-state joints have had recovered to a sufficient degree to avoid impairment of the assembled structures. Standard tensile test is unsuited to sense the mechanical properties of welded joints as the welding regions are relatively small (order of 500 μm to a few millimeters). Instead depth sensing test reveals as an attractive methodology since it allows for localized probing of microstructure and yet it is non-destructive, quick and easy to perform. However the depth sensing method of soft (elasto-plastic) and low work hardening metallic materials such as aluminum alloys is not so well developed as that of high work hardening materials in spite of the relevant literature available. Hence, frequently one has to rely of empirical factors to determine the desired elasto-plastic properties. The purpose of this study is to propose an experimental multi-cycle Vickers depth sensing test methodology which permits to directly extract a set of tensile-like elasto-plastic properties (e.g. elastic modulus, yield stress, maximum flow stress, work hardening coefficient) across a solid-state welded joint of aluminum alloy obtained by capacitor discharge welding. An ad-hoc FE Vickers indentation model, operating under load control as in the experiments, has been built to support the proposed experimental methodology. The FE indentation model utilizes the measured tensile-like stress-strain curve as an input. The model validation against experiments will be analyzed by comparison of indentation energies (on loading and unloading) and geometry factors (e.g. indentation depth and elasto-plastic radius).

Abdelaâdim Tibouda
Université du Québec à Trois Rivières –UQTR,Canada
Title: Analysis of effect the CMC and surfactant on the rheological properties and curtain stability of micro-nano fibrillated cellulose coating colors

Biography: My name is Abdelaâdim TIBOUDA, I’m industrial process engineer. Currently, I am a PhD student at the Lignocellulosic Materials Research Center at the University of Québec à Trois Rivières (UQTR) under the direction of Professor Patrice Mangin. I work on the optimization of curtain coating process using micro-nano fibrillated cellulose coating colors. My field of expertise encompasses : industrial processes, fluid mechanics, flow simulation using numerical methods, energy science and physicochemical analysis techniques.

Abstract: Rheological properties of the micro-nano fibrillated cellulose (MNFC) coating colors play an important role in curtain coating of paper. In the case of the curtain coating layer, curtain stability remains an issue to control the coating operation. The curtain stability is associated with rheological characteristics of the MNFC coating colors such as the viscosity and surface tension. Although viscosity is a standard property, surface tension also constitutes a key property in a proper curtain coating operation. Rheology modifiers or thickeners are used to control the viscoelasticity of the MNFC coating colors. Use of surfactant has been recognized as an useful approach to increase the curtain stability since low surface tension is highly desirable to get a stable extensional liquid flow. Effect of carboxymethyl cellulose (CMC) and a standard surfactant such as NIAPROOF4 on viscoelasticity and surface tension, was examined and compared. The change of curtain stability and bubble content brought about by these coating mixtures was also investigated.

Alessandra Fava
University of Rome Tor Vergata, Italy
Title: Temperature effect on strengthening mechanisms of nano-ODS steel

Biography: Alessandra Fava is an Italian PhD student at the University of Rome “Tor Vergata”. She is graduated in Materials Science at the University of Rome “Tor Vergata” in 2014. Nowadays she is a 2nd year PhD student in Industrial Engineering and the topic of the research is on metal alloys with application at high temperatures, especially on mechanical and microstructural characterization of Oxide Dispersion Strengthened steel and on computational simulations of welding of superalloys.

Abstract: Oxide dispersion strengthened (ODS) ferritic steels are candidate materials as structural components in fission and fusion nuclear reactors [1-3]. The strengthening of ODS steels is achieved by a uniform dispersion of very fine (10-50 nm) oxide particles (Y2O3) in the steel matrix and by an ultra-fine ferritic grain microstructure. A nano-ODS steel has been manufactured by low-energy mechanical alloying of a mixture of Fe-14Cr-1W-0.4Ti powder and 0.3 wt. % Y2O3 particles, and successive hot extrusion. The microstructural characterization was carried out by transmission electron microscopy (TEM), electron back scattering diffraction (EBSD) and X-ray diffraction (XRD). Tensile tests were performed at increasing temperatures up to 700 °C and the work examines the strengthening mechanisms and their dependence on temperature in comparison with those obtained on the Fe-14Cr-1W-0.4Ti matrix without Y2O3 particles.

Leonard Deepak Francis
International Iberian Nanotechnology Laboratory, Portugaal
Title: Structural and Chemical Analysis of filled Nanotubes

Biography: Dr. Leonard Deepak Francis is a group leader in the Department of Advanced Electron Microscopy, Imaging and Spectroscopy at the International Iberian Nanotechnology Laboratory (Braga, Portugal). His broad area of research is focused on the use of advanced electron microscopic techniques for the study of materials/nanomaterials for various applications, as well as in the study of fundamental physical phenomena and dynamics at the nanoscale. He also employs the Focused Ion Beam (FIB) technique extensively towards the investigations of nanodevices. He received his Ph.D. in 2005 from Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India and was a postdoctoral fellow (2006–2008) at the Weizmann Institute of Science, Israel.

Abstract: The hollow interiors of nanotubes could host the growth or filling of foreign elements/compounds to obtain hetero-structures. The growth of these materials in the confined one dimensional space lead to novel properties. There are different routes to obtain the filling of nanotubes. Among these capillary filling serves as a suitable method to enable filling of carbon nanotubes (CNTs) and inorganic nanotubes including those of BN and WS2.1, 2 In this talk the synthesis, structure and novel properties/applications of such 1D heteronanostructures will be discussed. Various suitable examples will be highlighted. These include recent work on filling of Gd and Bi-based compounds within CNTs and WS2 Nanotubes. In such complex heterostructures, the precise determination of the structure and composition is detrimental in its further application. Thus the investigation of the structure, morphology and chemical composition of filled nanotubes investigated using aberration corrected scanning/transmission electron microscopy and associated spectroscopic techniques (EELS and EDS) will be outlined.3 The three dimensional structure of such systems can be elucidated using electron tomography. However in the case of inorganic host nanotubes (ex : WS2 NTs) obtaining the three dimensional composition information is non-trivial due to the presence of multiple high atomic number elements. Therefore, EDS-STEM tomography which is a novel and emerging technique, employed to map the chemical composition in three dimensions will be highlighted.4 In order to reduce the beam induced effects on the specimen, tomography experiments are usually carried out at 80 kV. The experimental observations in these systems are adequately supported by carrying out Molecular Dynamics Simulation in order to elucidate and understand the difference in behavior of the various compounds towards their affinity to fill the interior of the Nanotubes.

HeungJae Choi
Sogang University, South Korea
Title: Study for high bonding strength between CFRP and metal

Biography: HeungJae Choi received his B.S.E. in the Department of Industrial Engineering at Hongik University in 2014. He is currently a graduate student in the Department of Mechanical Engineering at Sogang University under the advisement of Prof. Dongchoul Kim.

Abstract: Carbon fiber reinforced polymer (CFRP) has received a lot of attention because of its excellent properties, such as high tensile strength, good fatigue resistance, and low density. However, the utilization of CFRP is limited because the joining process of CFRP with other general materials such as steel has not been clearly established. Here, we present an advanced joining process of CFRP and metal, which ensure the bonding strength and the efficiency. The influence of resin types, adhesive, carbon fiber, and the condition of joining surface on bonding strength are investigated.The finite element analysis is performed for mechanical failure of joined parts considering the bonding energy of adhesive. The optimized joining process is developed and evaluated by lap shear tests. The presented process provides the great potential for the improved joining technology of dissimilar materials.

Abdeljalil JOURANI
Université de technologie de Compiègne, France
Title: Combined Effect of Abrasive Particle Size and Microstructure on Friction and Wear Mechanisms of Low Alloy Steel

Biography: AbdeljalilJourani is a Professor in Materials Science, Tribology and Engineer in Computer Sciences in University of Technology of Compiègne, France. He holds a PhD in Contact Mechanics (2005) at Centrale Lyon, France. His fields of interests aremicrostructure, multi-scale roughness, indentation, tribology and abrasion.

Abstract: The literature showed that wear and friction properties depend on many parameters of the tribosystem such as normal load and material bulk hardness. However, coupled contributions of microstructure and abrasive particle sizes are less investigated. A contribution in this field is proposed in the present work on 35NCD16 steel. Wear tests are performed under different normal loads (50-110 N) on a pin-on-plane configuration at cyclic sliding with abrasive silicon carbide grains ranging from 35 µm to 200 µm. To vary hardness and microstructure, the specimens are subjected to water quenching and tempering at various temperatures from 200°C to 600°C. The evolution of microstructures (Fig.1) and wear mechanisms of worn surfaces are analyzed using scanning electron microscopy (SEM). For a given microstructure and hardness, the friction coefficient decreases with increasing of normal load and decreasing of the abrasive particle size. The wear rate increase with increasing of normal load and abrasive particle size. The results also reveal that there is a critical hardness Hcriticalaround 430 Hv which maximizes the friction coefficient and wear rate (Fig. 2). This corresponds toa microstructure transition from martensite laths to carbides and equiaxed grains, for a tempering around 400°C. Above Hcriticalthe friction coefficient and the amount of material loss decrease with an increasing of hardness and martensite volume fraction This study also shows that the debris size and the space between the abrasive particles decrease with a reduction in the particle size. The coarsest abrasive grains lost their cutting edges, accompanied by particle damage and empty space due to the particle detachment from the resin matrix (Fig. 3). The compact packing nature of finer abrasive papers implicates lower particle detachment and facilitates the clogging (Fig. 3) and the transition from abrasive to adhesive wear. Keywords: Abrasive wear; Friction; Hardness; Microstructure;Martensite; Abrasive particle size.

Olalekan Ojedokun
Sheffield Hallam University, England

Biography: OlalekanOjedokun is a final year PhD student and works as a researcher at the Materials and Engineering Research Institute, Sheffield Hallam University, UK. His research interest is on the utilization of rice crop waste as alkali activated cementitious material and its durability properties.

Abstract: This paper reports an investigation on the size and distribution of capillary and gel pores in an alkali activated cementitious (AACM) mortar and comparative OPC mortar. These pore properties were determined from the cumulative and differential pore volume curves obtained by mercury intrusion porosimetry (MIP). The classification and distribution of these pores provides a useful insight to the properties of hardened concrete such as the durability, fire resistance and mechanical properties. The results show that AACM mortar mixes possess a bimodial pore size distribution while OPC concrete has unimodial pore sizes distribution. The intrudable porosity is lesser in AACM mortar than OPC mortar. The volume of the capillary pores was higher in AACM mortar compared with OPC mortar. However, the volume of the gel pores was much lower in AACM mortar than OPC mortar. The distribution of bimodal pores in AACM mortar is greatly influenced by the effects of curing type and the activator dilution. The distribution of unimodal pores in OPC mortar is similarly influenced by the curing type.

Eun Joo Shin
Dong-A University, South Korea
Title: Fabrication of nanocellulose/waterborne polyurethane/PEDOT:PSS nanocomposite dispersion for bio-based electrical polyurethane matrix

Biography: Eun Joo Shin was awarded Ph.D. in Textile materials from the Pusan National University in 2001. She then carried out postdoctoral research at the department of Textile Engineering in Yeungnam University and published original research papers about natural polymer based materials. Since 2013, she has been assistant professor of department of organic materials and polymer engineering in Donga-A University. Her research interests are biomaterials, cellulose application in bio-industry, and extraction of polysaccharides from marine organic materials.

Abstract: The purpose of this work is to prepare cellulose nanoparticles (CNs) and synthesis water-borne polyurethane (WPU) and CNs/WPU/PEDOT:PSS nanocomposite as well. This novel material will be used for bio-based electrical polyurethane resin or matrix. Waterborne polyurethane (WPU) is a versatile and environment-friendly material with growing applications in medical and industrial resin. The CNs was fabricated from microcrystalline cellulose using facile and environment-friendly strategy without using any harmful chemicals. The CNs/WPU nanocomposite was prepared with one-pot synthesis reaction between the exposed hydroxyl functionalities on the CN surfaces and isocyanate on the ends of the WPU prepolymer. The rheological properties of CNs/WPU and CNs/WPU/PEDOT:PSS dispersions with different solid contents were investigated with steady shear and dynamic oscillatory tests to evaluated the formation of the nanocomposite structure. The morphology, thermal and mechanical properties of the nanocomposite were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and wide-angle X-ray diffraction (WAXD).

Satoshi Kamiyama
Meijo University, Japan
Title: Nitride-based nanowire and multi-quantum shell active layer for advanced photonic devices

Biography: Satoshi Kamiyama received the BE in 1985 and PhD degrees in 1995 in electronics from Nagoya University, Japan. From 1988 to 1999, he joined Panasonic Co. Osaka, Japan, where he was pursuing research in the field of III-V compound semiconductor lasers. Since 1999, he had been a member of technical staff in Meijo University, Nagoya, Japan, where he worked research of group-III nitride materials and devices. He was adopted as an associate professor in 2001, and was promoted to a professor in 2007 at Meijo University, where he has continued to conduct the research of group-III nitride materials and devices.

Abstract: Recently, GaN nanowires, whose diameter is ranging from 100 to 500 nm, and GaInN/GaN multi-quantum shell (MQS) active medium surrounding the nanowires have attracted much attention for application of high performance photonic devices. According to our recent theoretical investigations, the MQS active layer is capable of much high optical confinement factors in both horizontal and vertical modes in semiconductor laser cavity under the wide variation of the volume of the active layers. In this paper, potential of 3D nanostructures on the performance of lasers and critical issues of photonic device fabrication are discussed Small pitch periodic formation of GaN nanowires and surrounding MQS active layers could provide an ideal waveguide for stable transverse horizontal mode, because of the in-phase-locking mechanism. Therefore, single beam high power laser could be realized despite of wider stripe width. It can also avoid COD problem in high power operation. In addition, high optical confinement factors in MQS laser will give the low threshold current density and high power operation, compared with conventional semiconductor lasers with 2D active layer. Our theoretical calculation predicts such high performance in the MQS-lasers. In the growth of GaN nanowires and surrounding MQS active layers, nanoimprinting lithography is adopted to make mask pattern, and selective growth technique provides the GaN nanowire with high aspect ratio of up to 10 (height to diameter ratio). However, such 3D active regions should be formed only in limited areas, because they are obstacle for formation of emitting mesa structure and contacts. We also discuss about the limited area formation of GaN nanowires.

Masahiko Ikeda
Kansai University, JAPAN
Title: Development of low-Cost Ti-Mn-Fe-Al beta type alloys


Abstract: Titanium exhibits many attractive properties. It is considered to be ubiquitous since it has the 9th-highest Clarke number of all the elements. However, the principal beta-stabilizing elements for titanium can be very expensive, e.g. Mo and V, making many titanium alloys expensive. Iron and Manganese are beta stabilizers for titanium alloys and it is also considered to be ubiquitous since they have the 4th-highest and 11th-highest Clarke number of all the elements, respectively. Furthermore, since iron has higher diffusion coefficient in beta phase of titanium, precipitation of omega phase becomes faster by iron addition. The behaviours of Ti-Mn and Ti-Fe alloys during heat treatment have been investigated and it was found that in some alloys the isothermal omega phase is precipitated. Because this phase can lead to brittleness, it is very important to suppress its precipitation. We investigated the effect of adding Al using Ti-8.1mass% Mn-1mass% Fe-0, 1.5, 3.0 and 4.5mass% Al alloys by performing electrical resistivity, Vickers hardness, and X-ray diffraction measurements. In solution-treated and water-quenched all alloys, only beta phase was identified. The resistivities at room and liquid-nitrogen temperatures were found to increase monotonically with increasing Al content, while Vickers hardness decreased up to 3mass% and then kept that value. Isothermal omega precipitation was suppressed by Al addition, while alpha precipitation was accelerated by Al addition. Moreover, I also describe an investigation of the influence of the Mn content on the phase constitution and heat-treatment behaviour of Ti-8 to 12Mn-1Fe-3Al (mass%) alloys.

Kahoul Abdelkrim
Université Ferhat Abbas de Sétif, Algeria
Title: Inhibition of calcium carbonate scale in presence of aqueous extract of olive leaves

Biography: Abdelkrim KAHOUL was born in Algeria in 1958. He received the Ph.D. degree from Sétif university in Algeria in 2002. Since 1987, he has been with the Department of Process Engineering, Faculty of Engineering where he is currently a Professor of Electrochemistry. His main areas of research interest are electrodeposition, corrosion, fuel cells, and scaling.

Abstract: Scale causes severe economic loss, since it limits heat exchange and can reduce tube diameter causing a significant decrease in water flow. In order to solve this problem many scale inhibitors have been used in cooling water systems [1]. The used inhibitors were found to reduce the scale growth. Nevertheless, the use of chemical inhibitors has been limited because of the environmental threat. Recently, natural compounds such as herb plants are again employed as inhibitors in order to develop new cleaning chemicals for green environment. Several studies have been published on the use of natural products as antiscalants and corrosion inhibitors in different media [2, 3]. The drinking water network in Ain Kébira in the area of the city of Sétif knows some scaling problems as the deposit of calcium carbonate CaCO3 on the pipe walls. This water is hard and naturally rich in minerals, such as calcium and magnesium. To reduce the CaCO3 scale formation on the network, the aim of this study was to investigate the effect of olive leaf extract as a novel, environmentally friendly, antiscalant for the water of Ain kebira using chronoampérometry, electrochemical impedance spectroscopy (EIS) and microscopic examination techniques. It was found that the extract acts as a good antiscalant for the tested system. The inhibition efficiency increases with increasing extract concentration. A concentration of 100 ppm was found to be an optimal concentration for preventing completely the CaCO3 deposit. The inhibitive action of the extract is discussed with a view of inhibtor adsorption onto the steel surface, making a barrier to scale deposit.

Yuki Ogi
Meijo University, Japan
Title: Evaluation of surface condition of road material with ultrasonic method

Biography: Graduate student at Meijo University (Nagoya, Japan) in the Division of Vehicle and Mechanical Engineering. He has been studied in the field of mechanics of materials, crash safety, and reliability of structures. His main research is the non-contact evaluation of material surface condition with ultrasonic method and signal analysis.

Abstract: The purpose of this study is to estimate the surface condition of road material, such as dry, wet, ice and snow, by using the ultrasonic system on the moving vehicle. As a first step, the asphalt, concrete and brick block were used as the specimen for examination and verification of the possibility of estimation with moving by the ultrasonic. The ultrasonic wave (the central frequency of 40 kHz) which propagated to the specimen in the air reflects at the material surface by the difference of an acoustic impedance and surface condition, and it is received the ultrasonic transducer. The ultrasonic system was set on the hand cart and moved 10m at the low velocity (walking speed) for measurement. The received wave is recorded by an oscilloscope (Fig.1) and analyzed in frequency domain by Fast Fourier Transform (FFT). The ultrasonic measurements are carried out at 6 times for each road materials. Ultrasonic wave was received at different 60 positions for a 10m measurement. Mean value and dispersion of the maximum amplitude in the FFT analysis are evaluated as a parameter for the estimation of the surface condition for three specimens used in the experiment. Brick block specimen has bigger value for the mean of maximum amplitude, and also the dispersion of the measurement result is wider than other road material (Fig.2). In the comparison of both parameters in three specimens, it is clear to show the different result by the surface condition of road material and the difference of acoustic impedance. The ultrasonic method is effective for the estimation of surface condition of road material. The parameter and measurement procedure which are more effective for the estimation will be continuously examined and evaluated.

Mohamed A. Taha
Ain-Shams University, Egypt
Title: Al -SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges"SiCp MMC: "Application Promises and Processing Challenges"SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp MMC: "Application Promises and Processing Challenges" SiCp


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To make these composites more interesting, the challenge lies in developing Processing methods should be adequate to produce uniformly distributed SiCp in the Al matrix, achieve good wetting between SiCp and Al matrix and prevent SiCp / Al chemical reaction, otherwise degrading the final properties of the composite is found. Processing should be with reduced complexity so that to reduce cost. Based on long term experience, the above issues are reviewed and discussed, while own work and ideas for the objective of developing processing routes and conditions for liquid phase processing are presented. Combing liquid phase processing with SiCp as particulates and a heat treatable Al alloy matrix, is able to produce a low cost composite. Development includes managing processing routes and conditions to achieve uniform distribution, an interface with good wetting conditions and lack of any chemical reaction. A modular mixing and casting system and technique for infiltration liquid Al through loose particulate for stir casting of low-Vf and squeeze casting of high-Vf subsequently are thought about. In both techniques, materials and their charging conditions, operating routes and pouring casting conditions should be carefully designed. Integrating stir casting with twin roll processing will be useful for production of the composite in the form of sheets, This is for massive and economic production since sheets are also interesting.

Amine Harrane
University of Abdelhamid Ibnbadis Mostaganem, Algeria
Title: Direct In-situ Polymerization to Produce Polycaprolactone/Maghnite Nanocomposites

Biography: Amine HARRANE is a full Professor of Chemistry in the Department of Chemistry, University of Abdelhamid Ibn Badis, Mostaganem, Algeria and Head of Research Team “Biodegradable Polymers” in the Laboratory of Polymer Chemistry, University of Oran 1, Algeria. Curently, he is the Manager of Algero-Portugues International Project on valorization of Natural Resources : “"Green thermosets: Nanocomposites of Rosin/Maghnite" 2016/2019. His research interests are the synthesis of biodegradable polymers and Nanocomposites using a green and eco friendly methodologies.

Abstract: Poly (e-caprolactone) (PCL)/Montmorillonite layered silicate nanocomposites have the advantage adding biocompatibility and biodegradability to the traditional properties of nanocomposites. They can be prepared by in-situ ring-opening polymerization of e-caprolactone using conventional initiator to induce polymerization in the presence of an organophilic clay, such as organomodified montmorillonite. In this work, we have used an alternative method to prepare poly(e-caproilactone)/montmorillonite nanocomposites. The cationic polymerization of e -caprolactone was initiated directly by Maghnite-TOA, organomodified montmorillonite clay, as a catalyst, to produce nanocomposites (Scheme 1). Resulted nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), force atomic microscopy (AFM) and thermogravimetry.

Pavel Baranov
Ioffe Institute, Russia
Title: Color centers in bulk and nanocrystalline SiC as a material platform for quantum photonics, sensing and information processing at ambient conditions

Biography: Pavel G. Baranov, born in Orenburg region, Russia, is currently Professor, Head of the Microwave Spectroscopy of Crystals Laboratory in Ioffe Institute, St Petersburg, Russia, is also affiliated as Professor to Peter the Great Saint-Petersburg Polytechnic University. His research interests lie in the field of magnetic resonance, spin and magneto-optical quantum phenomena in condensed matter, including semiconductors, ionic compounds and based nanoctructures; in the field of devices for radiofrequency spectroscopy and diagnostics of materials.

Abstract: The unique quantum properties of the nitrogen-vacancy (NV) color center in diamond have motivated efforts to find defects with similar properties in silicon carbide (SiC), which can extend the functionality of such systems. Atomic-scale color centers in bulk and nanocrystalline SiC are promising for quantum information processing, photonics compatible with fiber optics and sensing at ambient conditions. Their spin state can be initialized, manipulated and readout by means of optically detected magnetic resonance (ODMR) and level anticrossing. It has been shown that there are at least two families of color centers in SiC with S = 1 and S = 3/2, which have the property of optical alignment of the spin levels and allow a spin manipulation. For the S = 3/2 family, the ground state and the excited state were demonstrated to have spin S = 3/2 and a population inversion in the ground state can be generated using optical pumping, leading to stimulated microwave emission even at room temperature and above. SiC is taking on a new role as a flexible and practical platform for harnessing the new quantum technologies, it is a technologically friendly material, used in various devices (LED, MOSFETS, MEMS). Fabricating various types of microstructures and nanostructures in SiC, including SiC grating structures and quantum dots with color centers, has increasingly attracted owing to their potential applications in electronic and photonic devices. The successful use of metamaterials with NV centers in diamond and nanodiamonds provides a basis for suggesting a similar combination for color centers in silicon carbide whose radiation extends to a near infrared range of 800-1600 nm which is area of transparency for fiber optics and living systems. A review of optical and spin properties of color centers in hexagonal and rhombic polytypes of SiC will be presented, which can be greatly broadband enhanced in association with metamaterials for creation of single-photon sources and single-spin manipulations at ambient conditions. This work has been supported by RSF, RFBR #16-02-00877 and #16-52-76017 ERA.

Lucian Baia
Babes-Bolyai University, Romania
Title: Shape tailoring as a critical issue in photocatalysis

Biography: Lucian Baia earned his Ph.D. degree in 2003 at the University of Wuerzburg, Germany. Since 2008, he works as Associate Professor at the Department of Condensed Matter Physics and Advanced Technologies at the Faculty of Physics of the Babes-Bolyai University. His current research focuses on the obtaining and characterization of nanoarchitectures and materials with controllable morphology and structure for environmental and biomedical applications. He is author or coauthor of more than 120 peer-reviewed publications (h-index: 21), three books, and three book chapters, 3 patent applications and is serving as editorial board member for several scientific journals.

Abstract: Heterogeneous photocatalysis is one of the most promising advanced oxidation process as an increased amount of solar energy can be effciently used. The enhancement of the photocatalytic activity can be obtained by various approaches such as the deposition of noble metals, doping with transition metals/noble metals, or creating composites with other semiconductors/ carbonaceous structures. There are numerous studies in which the researches have been mainly focused on the effect of the concentration and size of the deposited noble-metal nanoparticles on the photocatalytic activity, but it was shown recently that their shape can also play an important positive role on the photocatalytic performances. Therefore, in the last period, our researches were focused on both the controlling of the photocatalysts shape and understanding its role on the photocatalytic performances. One presented approach consists in the understanding of the role played by the Au nanoparticle’s shape on the photocatalytical properties, when they are in contact with commercially available Evonik Aeroxide P25. Thus, three differently shaped Au nanoparticles, i.e. nanospheres, nanowires and nanotriangles, were synthesized and deposited on the surface of the commercial titania, and the photodegradation rate and hydrogen production of the composites were evaluated. In the second approach spherical and polyhedral Pt nanoparticles have been synthesized by chemical reduction, while the commercial products based on anatase, rutile, and both anatase and rutile, were used as base photocatalysts. Another research is referring to the shape controlled anatase titania microcrystals, in the presence of carbon nanotubes, having a high amount of the most reactive facets, i.e. {001}. Ordered/own faceted “crystallographic holes” were created by simple calcination and they were proved to enhance the photocatalytic activity of titania microcrystals to a higher extent. Furthermore, commercial titania-based TiO2-Pd nanocomposites by using spherical and cubical Pd nanoparticles were studied. The effect of the Pd nanoparticle’s shape on commercial photocatalysts, i.e. anatase, rutile, and combined compositions of the both titania crystalline phases, was highlighted in terms of photocatalytic pollutant degradations and H2 production. The observed changes in the photocatalytic performances were correlated with the alterations of the morphological and structural particularities exhibited by the investigated systems, highlighting for each investigation the benefits provided by the implementation of the shape tailoring as a main research strategy in the photocatalytic applications.

Katarina Mosnackova
Polymer Institute SAS, Slovakia
Title: Synthesis of polymer-graftedcarbon nanotubes bycombination of ROP and RAFT polymerization

Biography: Dr. Mosnáčková earned her Ph.D. in Macromolecular chemistry at Slovak University of Technology in Bratislava in 2012. Currently she works as a research scientist at the Department of Composite Materials of the Polymer Institute SAS. Her research is focused on the surface modification, preparation and characterization of polymer blends and composites. Emphasis is taken to the study of biodegradable and fully compostable polymers with tailored properties which make them suitable for wide range of applications.

Abstract: Carbon nanotubes surface modification resulting in polymer coating with uniform architecture and possibility to prepare block copolymer brushes has attracted wide-spread attention because it provides access to nanoparticles with novel structures and properties. Nowadays, the controlled polymerization techniquesare widely used for polymer “grafting from” approach which represents the most promising method due to its ability to precisely control the structure of the grafted polymer chains with varying range of graft densities [1]. The main advantage of reversible addition and fragmentation chain transfer (RAFT) polymerization compared to the traditional atom transfer radical polymerization, is in a possibility to control the polymerization without using metal catalysis allowing to graft a water-soluble polymer onto a solid surface [2]. Moreover, the introduction of PHEMA-g-PCL copolymer moieties to the different types of surface resulting in improvementof the physicochemical and thermoresponsive properties and thanks to biocompatible and hydrophobic characters of PCL can be use for antitumor nanocarrier applications and tissiue engineering [3]. Here thepolymer hybrids based on multiwalled carbon nanotubes (MWCNTs)were synthesized through “grafting from” strategy. First, the hydroxyl groups were generated on the MWCNTs surface by different functionalization techniques and were used for immobilization of 4-cyano-4-(phenylcarbonothioylthio) pentanoic acid as chain transfer agent (CTA). From attached CTA agent an uniform poly(2-hydroxyethyl methacrylate) (PHEMA) chains were grown in control manner. In the last step, pendant hydroxyls of PHEMA were used for initiation of ring opening polymerization of -caprolactone (CL) in bulk catalysed bytin (II) octoate. The molar mass of the prepared brushes was characterized by GPC, while the 1H NMR analysis was used for determination of monomer conversion. The structure and grafted polymer quantities of MWCNTs-PHEMA-g-PCL were characterized by XPS, TGA, XRD, AFM, FTIR and Raman spectroscopy.

Shih-Yun Chen
National Taiwan University of Science and Technology, Taiwan
Title: Interface interactions and enhanced room temperature ferromagnetism of Ag@CeO2 nanostructures

Biography: Shih-Yun Chen is a professor in the Department of Materials Science and Engineering at National Taiwan University of Science and Technology (NTUST). She received her Ph. D. degree in Materials Science and Engineering from National Cheng-Kung University in 2003, and after that she was a post-doctoral fellow in Institute of Physics, Academia Sinica from 2004 to 2007. She joined Laboratoire de Physique des Solides, CNRS (France) as a visiting researcher from 2005 to 2006. Her research focuses on the physics of metal oxides nanomaterials, with particular emphasis on imaging and spectroscopy of magnetic semiconductors.

Abstract: Enhancement of room temperature ferromagnetism (RTFM) has been obtained with core-shell metal-oxide nanoparticles (Ag@CeO2). To enhance the magnetism properties, interfacial charge transfer is achieved via the formation of a core-shell interface. Furthermore, by varying the shell thicknesses, additional control of the RTFM can be obtained. The Ag@CeO2 core-shell nanoparticles are synthesized successfully via a two-step method. Ag nanoparticles (NPs) are first synthesized on TiO2 substrate by thermal assisted photoreduction method, then CeO2 NPs are deposited on the surface of Ag NPs by chemical reduction. No surfactants or organic compounds are used during the synthesis. At the interface between the core and the shell, electron transfers from the Ag-p orbital to the Ag-d and Ce-f orbitals are evidenced by X-ray absorption spectroscopy and electron energy loss spectroscopy. Such interfacial charge transfer results in enhanced room temperature ferromagnetism in the Ag@CeO2 core-shell NPs as compared to magnetism arising for bare Ag or CeO2 NPs. This study suggests that tailoring the interface, the surface and their coupling in nanostructured metal-oxides core shell nanoparticle is an effective way to enhance their magnetic properties.

Xiyun Yan
Institute of Biophysics, Chinese Academy of Sciences, China
Title: Nanozymes: Enzymatic Activities, Catalytic Mechanisms and Extensive Applications in Biomedicine


Abstract: Since the first evidence showing that ferromagnetic nanoparticles with intrinsic peroxidase-like activity1 has been published almost decade ago, a specified term, “Nanozyme”,defining a class of nanomaterials with enzyme-like activities, has been widely accepted2-3and there have been more than 40 kinds of nanomaterials discovered to possess intrinsic activity similar to enzyme.These studies have changed the idea that inorganic nanomaterials are chemically inert in biological system, and has directly led to a new concept stating that nanomaterials could be bioactive, which opens up a wide range of applications of nanomaterials for human health and living environment4. Here, I would introduce the progressof nanozyme and its latest applications in biomedicine.

Oscar E Pérez
National Lanús University, Argentina
Title: Nanovehicles design for bioactives compounds

Biography: Professor at National Lanús University(Buenos Aires) in the Department of Productive Development and Technology. The has been trained in the field of nanoparticles, biopolymers and food colloids. Dr Pérez has expertise in nano and microencapsulation of bioactive compound, i.e. bioactives peptides, micronutrients, folic acid, insulin, growth factors. His research group has started the study of nanovesicleproduction generated by probiotic lactic acid bacteria, the purpose is exerting the "bio-nano-encapsulation” of nucleic acids and reporters overexpressed proteins, the so called interkingdom communication. He is author and co-author of more than 50 scientific works between papers in recognized journals and book chapters. He has also contributed to over 120 communications in conferences.

Abstract: Physicochemical and biochemical characterization results crucial for the nanovehicles design which could run as bioactive compounds delivery systems (BCD). These systems are engineered based on interdisciplinary approaches that combine polymer science, biconjugate chemistry, pharmaceutics, food science and molecular biology and physiology. Many recent studies look into natural ways to harness macronutrients, i.e. proteins, carbohydrates and lipids for efficient delivery of micronutrients and bioactive compounds. To this end, significant advances have been made in respect to the formation and rational design of particulate-based delivery systems. Punctually, we offer here an overview of different biopolymers based nanovehicles constructed and characterized in our lab. The nanovehicles will be generated under different concept, i.e. polyelectrolyte interaction, molecular self-assembly. The encapsulating material was constituted by biopolymers such as chitosan and proteins. The encapsulated material has high impact in nutrition, i.e. bioactive peptides, micronutrients, folic acid, or in biomedicine, insulin, growth factors. These nanostructures do constitute real systems for the encapsulated ligands protection during processing and exerting its controlled release in the body, having on turn the advantages offered by the Nanoscale. Different techniques were used for the molecular characterization of the chemical species, i.e. dynamic laser light scattering (DLS), NMR, FTIR, rheometry. To quantify the encapsulating and encapsulated species interactions, the loading capacity quantification for the designed nanovehicles, complementary approaches were applied, i.e. fluorescence spectroscopy, DLS, zeta potential measurements, etc. High performance microscopy (SEM, AFM) helps us to describe nanovehicles ultrastructure. In-vitro biological impact for the encapsulated ligand was evaluated on appropriate cellular lines.

Gagik G. Karamyan
Kapan Laboratory of Metallurgy and Enrichment at Institute of Chemical Physics, Armenia
Title: Processing of metal sulfide concentrates by water vapor

Biography: I, Gagik G. Karamyan, has born in 1947 in Yerevan, Armenia. I graduated from Yerevan State University in 1970 (specialty Physics). In Moscow State University I received the PhD degree (in Physics) in 1979. My scientific interests include material science, mineral processing, renewable power sources, electrochemistry, biosensors. I am coauthor of over 90 publications in scientific journals and conferences proceedings. I have 11 patents, participated in various international conferences. Now I am working as a senior scientist in Institute of Chemical Physics and Institute of Physiology of National Academy of Science of Armenia. I have two children, son and daughter.

Abstract: Metal sulfide ores are widespread over the world including Armenia. They content different metals such as molybdenum, copper, iron, zinc, lead as well as minor accompanying valuable metals: rhenium, gold, silver. The common method of processing of these ores is pyrometallurgical high-temperature calcination resulting in converting metals in oxides and release of sulfur in the form of SiO2 gas. This method has drawback because it is energy intensive and leads to the loss of useful elements and atmosphere pollution. Continuing studies performed in our laboratory led to the creation of new environmentally and efficient technology of processing metal sulfide concentrates by water vapor. Advantages of this method consist in high degree of metal extraction as well as catching of sulfur in the form of Na2S and elemental sulfur. For example, the technology applied to molybdenum sulfide concentrate provides high level of extraction of molybdenum (98.5%), rhenium (94%) and sulfur (98.4%), so it is efficient and environmentally friendly. The technology has been elaborated and tested on various types of metal sulfide concentrates in laboratory scale as well as in pilot plants. Mechanism and optimal regimes of physical-chemical reactions proceeding during the processing are presented. Because our technology is elaborated for processing in closed cycle regime, it is not accompanied with formation of solid, liquid and gases waste.

Mohamed Rachik
Université de Technologie de Compiègne, France
Title: Material parameter identification of ductile fracture criterion using a bi-level reduced surrogate model

Biography: M. Rachik received the Ph. D. degree in computational mechanics from Compiègne University of Technology (France) in 1993. He is presently Associated Professor and participates to graduate courses in solid mechanics, mathematics and numerical analysis. His current research interests include numerical simulation of forming and joining processes with particular attention to constitutive modeling, inverse analysis and test design.

Abstract: The application of dual-phase (DP) steel in the automotive industry is usually limited by its ductile fracture behavior during forming processes or in service conditions (crash) [1,2]. Therefore, in this work, a bi-level reduced surrogate model is proposed to identify the material parameters of ductile fracture criterion. The method combines local critical elements with a global fracture models. The surrogate model of fracture strain computed using Diffuse Approximation [3] and the local elements, reduces the computational effort for searching the material parameters ensuring the best fit. Global fracture simulations are preformed to update the target fracture strain and to compute the corresponding failure onset displacement. Satisfactory results are obtained via successive applications of Design of Experiments (DOE) [4] and enhanced design space transformation algorithms. The proposed identification method is validated for a phenomenological ductile fracture criterion [5] on material DP590 steel. Reliability of this method is confirmed with different initial guess. Using this method, the identification process can become pretty simplified with a limited number of experimental tests and reasonable computational effort. It can provide a new direction for material parameter identification based on surrogate model which can effectively be implemented to predict the ductile fracture behavior.

Gayong Shim
Seoul National University, South Korea
Title: Claudin 4-targeted phototherapy of nanographene


Abstract: We report the development of a claudin 4-directed dual photodynamic and photothermal system comprising a claudin 4-binding peptide tethered to reduced graphene oxide (rGO) nanosheets via a polyethylene glycol spacer linked to a noncovalent anchor that also acted as a photosensitizer. Chlorin e6 (Ce6) was utilized as the photosensitizer and tether to link the claudin 4-binding peptide, Clostridium perfringens enterotoxin (CPE) peptide, to the rGO nanosheets. The 30 amino acid CPE peptide was linked to Ce6 through the polyethylene glycol spacer (CPC) and anchored onto the rGO nanosheets to form CPC/rGO nanosheets. For comparison, a conjugate of polyethylene glycol and Ce6 (PC) was anchored onto the rGO nanosheets to generate PC/rGO. Both the PC and the CPC generated the reactive oxygen species upon irradiation at 660 nm. Moreover, application of CPC/rGO to claudin 4-overexpressing U87 cells resulted in a significantly higher cellular uptake compared to application of PC/rGO. Upon irradiation at 660 or 808 nm, the CPC/rGO-treated U87 cells generated a significantly higher reactive oxygen species or temperature increase, respectively, and showed synergistic anticancer effect than the other groups. Taken together, these results suggested that CPC/rGO is potentially useful as a tumor-specific and combined phototherapy.

Hohyeong Kim
Korea Institute of Industrial Technology, South Korea
Title: Surface-area-controlled synthesis of porous titanium dioxide thin films

Biography: Hohyeong Kim joined Research Institute of Advanced Manufacturing Technology, Surface R&D Group, Korea Institute of Industrial Technology (KITECH), in 2009 as a researcher. He received his B.S. and M.S. degrees from the Inha University, Republic of Korea in 2007 and 2009. He has been working on metal oxide gas sensors and on the synthesis of metal nanoparticles.

Abstract: In view of the progressively strict legal limits for emission of toxic gases, researchers have shown great interest in developing materials and devices with enhanced electronic properties to control the level of air pollution. Semiconductor oxides generally offer an advantage over other materials due to their ease of fabrication, low cost, good reliability/stability, high sensitivity, and real-time detection ability towards low concentration of toxic gases at per million levels (ppm) [1]. Grain size, crystallinity, and surface area are important parameters and are significant to control and sensing ability of metal oxides [2–4]. Surface-area-controlled porous TiO2 thin films were prepared via a simple sol–gel chemical route, and their gas-sensing properties were thoroughly investigated in the presence of typical oxidizing NO2 gas. The surface area of TiO2 thin films was controlled by developing porous TiO2 networked by means of controlling the TiO2-to-TTIP (titanium isopropoxide, C12H28O4Ti) molar ratio, where TiO2 nanoparticles of size ∼20 nm were used. The sensor’s response was found to depend on the surface area of the TiO2 thin films. The porous TiO2 thin-film sensor with greater surface area was more sensitive than those of TiO2 thin films with lesser surface area. The improved sensing ability was ascribed to the porous network formed within the thin films by TiO2 sol. Our results show that surface area is a key parameter for obtaining superior gas-sensing performance; this provides important guidelines for preparing and using porous thin films for gas-sensing applications.

Seon-Hyo Kim
Pohang University of Science and Technology(POSTECH), South Korea
Title: Development of thermal transport-alleviated mold flux by maximized extinction coefficients during casting process


Abstract: In continuous casting of steel, it has been recognized that surface defects on the slab could be occurred by non-uniform growth of strand. To prevent uneven solidification of steel shell, it is intensively necessary to regulate heat flux across mold slag film between copper mold and strand. Several studies have been reported that heat flux might be decreased by increasing crystallinity degree of mold slag contributed to greater interfacial thermal resistance and low transmittance of radiation. However, mold slag with high basicity could induce lack of lubrication resulting in another type of surface cracks such as streak mark or sticker breakout. Main objective of present study is to moderate heat transfer rate between copper mold and solidified shell by scattering effects of metallic iron particle contained mold slag. The thermal behaviors of (100-x)(CaO-SiO2-CaF2-Na2O-B2O3)•xFe (x=0-1) slag system has been studied by using infrared emitter technique (IET). To verify the effect of thermal radiation on total heat transfer across slag layer, the extinction coefficient was examined for glassy film using a UV and FT-IR spectrometer. For evaluating scattering behavior of iron droplets on extinction coefficients, the particle size distribution has been measured by scanning electron microscope (SEM). The scattering coefficient of spherical particles in glassy matrix was estimated by Mie scattering theory. The theoretical scattering coefficient is demonstrated about 1,600-3,290m-1 in comparison with experimental value of 1,710-3,680m-1. Hence, scattering effects by iron particles could be a strong reducing agent of incident radiation which controls heat transfer across glassy slag film without any fatal effects on lubrication on casting process.

Abdul Shakoor
Qatar University, Qatar
Title: Effect of reinforcement concentration on the properties of hot extruded Al-Al2O3 composites synthesized through microwave sintering process

Biography: Dr. R.A. Shakoor is currently working as Assistant Professor in the Center for Advanced Materials (CAM), Qatar University, Doha, Qatar. He holds a PhD degree in Materials Engineering. His area of research focuses on the synthesis and characterization of advance materials for various applications. He has been awarded with several academic and professional awards because of his outstanding academic, industrial and research achievements. His research work has been published in high impact factor international journals like JACS, Adv. Functional Mater. etc with decent number of citations. He likes to share his important findings with local and international research community.

Abstract: In this study, Aluminum matrix composite reinforced with 5, 10 & 15 vol.% Al2O3 particles were fabricated using microwave assisted rapid sintering technique followed by hot extrusion. The effect of concentration of Al2O3 reinforcement particles on physical, structural, mechanical and thermal behavior of the extruded Al–Al2O3 composites was investigated. Results showed that, as the content of hard ceramic particles increases, it improves overall mechanical properties including microhardness, 0.2% yield strength, ultimate compression/tensile strength, and Young's modulus while the ductility and co-efficient of thermal expansion decreases. XRD patterns and SEM/EDS mapping images show a uniform distribution of Al2O3 particles in the Al matrix. Owing to the existence of the reinforcement particles, the Al-15vol.%Al2O3 composite attains an ultimate tensile strength and yield strength of 154±6 MPa and 139±8 MPa, respectively, representing an enhancement of 33% and 32.4% compared to the pure aluminum. In particular, the extruded Al-15vol.%Al2O3 composite exhibited superior tensile strength at higher temperatures (~128±3 MPa at 100oC and 110±4 MPa at 200oC) when compared to Al matrix. The reduction of coefficient of thermal expansion (CTE) was ascribed to the strong interface bonding in the Al/Al2O3 composites. Findings presented are expected to pave the way to design, develop and synthesize aluminum based composites for weight critical applications at ambient and reasonable elevated temperatures.

Maryam Alejji
Imperial College London, England
Title: Understanding Engineered Nanomaterials in the Environment: Silver Nanoparticles (AgNPs)


Abstract: The transformation of silver nanoparticles (AgNPs) in the environmentpotentially affects their properties and toxicity [1]. Sulfidation of AgNPs has been observed in both natural waters and urban waste water systems reducing their toxicity [2]. The main mechanism of AgNPtransformation in the environment is electrochemical reaction with sulfur species: forming silver sulfidenanoparticles Ag2SNPs. However, during the sulfidation processes, variousstructures are formed before the final sulfide end-product. The bioreactivity of each of these intermediates, especially with the presence of a dissolved organic matter such as humic acids (HA) [3], requires further investigation. The presence of HA in the environment could influenceNP transformation and also alter their physical and chemical properties [4]. The attachment of HA groups on the surface of AgNps has also been shown to increase their colloidal stability [5]. In this research, a system of a H2S gas production designed to mimic environmental transformation of AgNps with and without humic acid. Production of partially sulfided nanoparticle intermediates is carried out in order tostudy their bioreactivity in the environment in a controlled way. We have observed that the sulfidation mechanism tends to produce a structure of core–shell Ag0–Ag2S that develops into hollow Ag2SNps with the presence of HA. High resolution transmission electron microscopy is used to image the particle transformation and their interactions with environmental species.

Caixia Qi
Yantai University, China
Title: Au/ Cu- FeLa–Al2O3: A highly active, selective and stable catalyst for preferential oxidation of carbon monoxide

Biography: Dr. Caixia Qi, received her Ph. D degree from Lanzhou Institute of Chemical Physics of Chinese Academy of Sciences in 1996 and served as a STA postdoctoral fellow, an associated researcher and a guest researcher in Osaka National Research Institute of Japan (Kansai AIST), Royal Military College of Canada and Tokyo Metropolitan University, respectively. Now, she is a professor in Yantai University and was awarded Shandong Taishan Scholar in 2011. She is engaged in the research of gold catalysis and populating industrial applications of gold nanotechnology. In 2011, she promoted and organized the Shandong Applied Research Centre of Gold Nanotechnology (Au-SDARC), an open-end industry-academia- research platform for speeding up industrial applications of gold which features regional advantages and compliance of international standards.

Abstract: A series of gold-based catalysts supported on the composite support of Fe–La–Al2O3 doped with various amounts of copper were prepared using a modified deposition-precipitation method. Investigations were carried out based on the reaction of the preferential carbon monoxide oxidation (CO-PROX) in H2-rich stream and low temperature CO oxidation in O2-rich stream as a reference to examine the effects of copper on the catalytic performance. The high dispersion of gold nanoparticles in alumina-based support, the formation of Au–Cu alloy, and the close contacts of these neat or alloyed nanoparticles with CuO species, making Au partially positively charged, were evidenced through examination with H2-TPR, XPS, and HRTEM-FFT techniques. Very promising gold catalysts for polymer electrolyte membrane fuel cell with positive results in activity, CO2 selectivity, and thermal stability and long-term storage and on-line stability were obtained. Although H2 addition decreased the rate of CO oxidation over the studied gold catalysts, the activity and selectivity in CO2 formation were continuously improved with an increase in copper loading.

Li Cui
Beijing University of Technology, China
Title: Microtexture characterization of laser welded 5A90 Al-Li alloys

Biography: Li Cui, associate professor, is teaching and doing researches at Beijing University of Technology. She received her Ph.D. degree from Pukyong National University in 2003. From 2006 to 2008, she had engaged in studying on fiber laser welding and laser-arc hybrid welding technology as a postdoctoral research fellow at Nagoya University. Currently, her current working fields are mainly concerned with the dissimilar materials joining using laser welding methods. She undertakes in several projects from National Natural Science Foundation, Beijing Natural Science Foundation and the Aeronautical Science Foundation, et al. She has published over 40 papers.

Abstract: 5A90 aluminum alloy, an aluminium–lithium (Al–Li) based alloy provided by Southwest Aluminum Co., Ltd, China, has the advantages of excellent corrosion resistance and weldability. In order to understand 5A90 Al-Li alloys further and enable expansion of its usage, laser welding of 5A90 Al-Li thin sheets has been developed to meet the needs of the medium strength applications in the aircraft and aerospace structures. It has been reported that some distinct microstructure differences are found between the base metal and the weld metal, nevertheless, it is still important to further clarify the microstructural characteristics of the weld metal of 5A90 Al-Li alloys. Given that texture often causes anisotropic mechanical properties, its presence in the weld zones of aluminum alloys could be quite significant. The information available on weld metal texture of 5A90 Al-Li alloys is, however, relatively scanty. Generally the grain orientation image maps (OIM), pole figures (PF), misorientation angles and orientation distribution function (ODF) can provide a useful description of the textures, the extracted texture information is insufficient. Moreover, the texture difference along different sample directions (for example, sample directions including the rolling direction (RD), the transverse direction (TD), and the normal direction (ND)), which is quite essential to performance controlling of the welded joint, is still not very clear. Therefore, laser welding of 5A90 Al–Li alloy sheets in a butt-joint configuration was carried out autogenously. The texture characteristics of the weld metal and base metal of the joints was examined quantitatively using electron back scattered diffraction (EBSD) along the horizontal surface and the transverse section of the welded joints, respectively. The results show that the base metal in the horizontal surface and the transversal section exhibits obvious different grain orientation, grain morphology, predominate texture ingredients, distribution intensities of textures, and grain boundary misorientation distribution, indicating the orientation and texture in the base metal is heterogeneous along the two directions. Although the weld metal in the two directions exhibits similar grain structural features in terms of grain orientations, grain shapes and grain sizes, a distinct difference in the texture intensity and misorientation distributions of the weld metal can be observed. The difference in the texture of the weld metal might be attributed to the initial texture difference in the as-received base metal for 5A90 Al-Li alloys.

Zakaria Boumerzoug
University of Biskra, Algeria
Title: Welding of similar and dissimilar materials

Biography: Boumerzoug Zakaria has completed his Ph.D. in 1998 from Constantine University, and was Professor in 2005. He was in Biskra University, the head of Mechanical Engineering Department (from 1998 to 2005) and Metallurgy Department (from 2005 to 2009). He has published more than 40 papers in reputed journals and is serving as an editorial board member. He has organized seventh schools on materials characterization. He has supervised more than 10 PhD students. He has presented more than 20 conferences in different countries ( France, Italy, Turkey, China, etc..). He has contributed as reviewer in some journals of materials science.

Abstract: Welding is a process of joining materials into one piece. Welding is used extensively for pipe welding, aerospace, aviation, biomedical implants, fabrication of race cars, choppers, etc. Welding processes include thermal fusion joining processes and solid-state joining processes. Concerning the thermal fusion joining processes, the most common process is electric arc welding. This traditional welding process has been used for joining similar metallic materials. However, the solid-state joining process, a friction stir welding is aplied to join two facing workpieces without melting the workpiece material. This technique of welding has great is used to weld dissimilar materials. This type of welding is gaining renewed interest [1], because the main objective is to reduce the total weight and maintaining essential physical properties. Two friction welding processes are available, linear friction welding and rotary friction welding [2]. The objective of this paper is to present some previous works about welding of similar materials like joinning steel to steel by arc welding process and joinning of dissimilar materials like steel to aluminium by friction stir welding procedure.

Alexander F. Razin
Central Research Institute for Special Machinery, Russia
Title: Two-matrix composite material with continuous carbon fibers made by 3D-printing

Biography: Alexander F. Razin, born in 1956, graduated from Moscow technical university on 1979. Doctor of Sciences in Engineering since 2003. General Director and chief designer of the Russian Central Research Institute for Special Machinery since 2016. Expert in design and manufacturiong of composite structures.

Abstract: 3D-printing of composite materials with continuous carbon fibers and thermoplastic matrix is a promising process of modern composite technology. However, relatively high viscosity of molten thermoplastic matrix cannot provide the proper fiber impregnation in the 3D-printing process and results in poor mechanical characteristics of the fabricated composite material. To overcome this shortcoming the two-stage fabrication process is proposed and discussed in the presentation. On the first stage, fine 1K or 3K carbon tows are impregnated with thermoset resin and completely cured in a special impregnation machine, thus resulting in the so-called composite fibers, which are characterized with high fiber volume fraction and extremely high specific strength and stiffness. On the second stage, composite fibers with diameter from 0.2 to 0.5 mm (depending on the initial tow) are covered with molten thermoplastic matrix in the special extruder of a 3D-printer which provides the required trajectories of composite fibers and the structure of the fabricated composite part. The process allows us to fabricate two-matrix unidirectional composite material reinforced with continuous carbon fibers which are characterized with the following properties: • fiber volume fraction 0.3 (result of two-step impregnation); • longitudinal modulus 60 GPa; • tensile longitudinal strength 650 MPa; • compressive longitudinal strength 400 MPa; • transverse tensile elongation 0.9%; • density 1250 kg/m3. The presentation includes the examples of particular composite structural elements made by 3D-printing in industrial conditions.

Yong Liu
Wenzhou Medical University, China
Title: Nitrogen-doped graphene as high-performance catalysts for biosensing

Biography: Dr Yong Liu has been worked in Wenzhou Medical University since 2009 as the Principal Investigator. He received his PhD degree from University of Wollongong (UOW) in 2007. He was an Associate Fellow in UOW after graduation. He worked as a Postdoctoral Scientist in University of Dayton and Case Western Reserve University during 2008-2009. Dr Liu’s expertise lies across the development of nanoscale devices for multifunctional biomedical applications. He has published 42 papers with total citations >3600 times. His h index is 21. He has received several awards including Qianjiang Distinguished Scholar Award and Scopus Young Researcher Award in China.

Abstract: Nitrogen-doped graphene (N-G) has been seen as an effective electrocatalyst recently. The improved catalytic performance for the N-G catalyst is attributed to the electron-accepting ability of the nitrogen atoms, which created net positive charge on adjacent П-П conjugated carbon atoms in the carbon plane to readily attract electrons from the anode for facilitating the catalytic process. As such, doping П-П conjugated carbon atoms with nitrogen hetero atoms in the nano electrodes can efficiently create active sites for electrochemical catalysis. The demonstration of this new role of nitrogen doping is important and has prompted us to design and develop various novel catalysts for diverse applications such as electrochemical or optical biosensors. In this presentation, I demonstrate our recent progress on preparation of polymers functionalized N-G using the novel ball milling technique. Polymers were incorporated through a ball milling process to prepare well-defined nitrogen-containing conjugated carbon nanostructures. Introduction of the polymer provides not only the electron-acceptor nitrogen, but also a highly conducted platform-the П-П conjugated carbon plane for efficiently transportation of electrons. Combination of N-G and polymers by a facial but efficient way allows us to develop novel metal free catalysts for various applications beyond biosensing.

Sung-Tag Oh
Seoul National University of Science and Technology, South Korea
Title: Dispersion of Y2O3 Particles in Ni-base Superalloy Powders by Ball Milling and High Pressure Homogenizer

Biography: Professor Sung-Tag Oh got his Dr.rer.nat. degree in the Faculty of Chemistry, University of Stuttgart, Germany. He worked at Fine Ceramics Research Association in Japan as a NEDO researcher before he moved to Seoul National University of Science and Technology, Korea. His expertise lies in the area of porous materials, nanocomposite processing, high temperature materials.

Abstract: The dispersion of nano-sized oxide particles with thermal stability inhibits dislocation motion and strengthens the metal matrix. Thus, oxide dispersion-strengthened (ODS) alloys are widely used in aircraft and powder-generation turbines due to their excellent strength and high creep resistance. Generally, ODS alloys were synthesized by the high energy ball milling of elemental metal powders added with nano-sized oxide particles, in which mechanical alloying process by high energy ball milling enables the insoluble oxide particles to be finely and homogeneously distributed in the metal matrix. However, for the microstructure control with required characteristics new approach including homogeneous dispersion of oxide particles is needed. In this work, Ni-15Cr-4.5Al-4W-2.5Ti-2Mo-2Ta-0.15Zr superalloys with nano-sized Y2O3 dispersion were ball milling and high pressure homogenizer. For comparison, the ODS Ni-base alloy powders were synthesized by high energy ball milling. The powders prepared by high pressure homogenizer showed a homogenous dispersion of nano-sized oxide particles on the surface of Ni-base powders. Microstructural characteristics of ODS Fe-base powders were analyzed by XRD, SEM and TEM. The relationship between synthesis processing and microstructure was discussed.

Mustafa Zor
Bulent Ecevit University, Turkey
Title: Characterization and Modelling of Mechanical Behavior of Heat Treated Wood Filled SMA Composites

Biography: Mustafa is a teaching staff at Bulent Ecevit University, TURKEY. He graduated from University of İstanbul, with bachelor degrees in forest industry engineering in 2008. After graduated, he lived in Bartın and graduated from University of Bartın in 2011. He won the scholarship from TUBITAK and lived to do PhD in USA for 9 months. He finished the PhD in 2017. He is working on wood based composites and its applications areas.

Abstract: Finite element analysis (FEA) has been used as a numerical method for the modelling of properties of different materials. In this paper, ANSYS, a software for FEA, will be used to modelling the heat treated wood filled Styrene Maleic Anhydride (SMA) composites obtained from different loading fillers. The heat treated wood filled SMA copolymer composites were produced from different loadings (10, 20, 30 wt. %) of heat treated and untreated the eastern white pine wood flours (Pinus strobus L.). The main objective of this paper is to compare the experimental and FEA results of wood filler SMA copolymer composites were produced by melt compounding through injection molding and usage areas of these composites will be investigated.

Takashi Kimura
Kyushu University, Japan
Title: Efficient manipulation of spin current in metallic nanostructures

Biography: Dr. Takashi Kimura, is a research scientist in the field of spintronics. Especially, he has developed various experiments concerning the manipulation of pure spin current in metallic systems. He got his B Eng. in Electronics, M Eng in Nano-Electronics, and Ph.D from Osaka University. He was a research fellowship in Riken, and was assistance professor in Institute for Solid State Physics, University of Tokyo. Now, he is a Professor for Department of Physics, Graduate School of Sciences and the director of Quantum Nano-Spin Sciences Research Center, Kyushu University, Japan. He was awarded IUPAP Young Scientist Metal in the field magnetism 2009.

Abstract: Generation, manipulation and detection of spin currents are important issues in the operation spintronic devices because a spin current plays an important role in spin-dependent transport and spin-transfer switching. Especially, pure spin current which is the spin current without accompanying the charge current is an attractive quantity for utilizing the spin current efficiently. Nonlocal spin valve measurements in laterally configured ferromagnetic metal (FM)/nonmagnetic metal (NM) hybrid nanostructures is a powerful means for evaluating the intriguing properties of pure spin current precisely. In this talk, I will introduce materials for the efficient generation and detection of the pure spin current and a structure for efficient control of the absorption property of the pure spin current. In the first part, I will introduce the results on the efficient generation of pure spin current using CoFeAl. We show that CoFeAl alloy is an excellent material not only for the electrical spin injection but also thermal spin injection because of its favorable band structure.[1] Moreover, the wireless microwave irradiation in the ferromagnetic metal is found to achieve the efficient thermal spin injection wirelessly.[2] In the second part, I will introduce an unconventional lateral spin valve structure, in which the pure spin current flows in a FM/NM bilayer. We show that the effective spin diffusion length can be modulated by the direction of the magnetization of the FM layer in the spin-current channel.

Kyung Hyun Min
Kyung Hee University, Korea
Title: Mineralized nanoparticles as contrast agents for multimodal imaging

Biography: Kyung Hyun Min received his Ph.D. degree in pharmacy from Kyung Hee University in Korea in 2013. He did research as a post-doctoral research associate at National Institutes of Health (NIH). In March of 2017, Dr. Min joined Prof. Sang Cheon Lee’s Laboratory of Kyung Hee University. His current research interest focuses on the development of potent theranostic systems for diagnosis and therapeutics of various diseases.

Abstract: To date, diverse imaging modalities have been used to investigate morphological and functional information inside the body. However, each imaging modality has its own unique disadvantages, which limit providing accurate and comprehensive information. To compensate for this limitation, the combination of two or more imaging modalities has attracted much attention in recent years. Herein, we developed Gd2O3 nanoparticle-loaded calcium carbonate (CaCO3) mineralized nanoparticles (Gd2O3-MNPs) that can generate CO2 bubbles and trigger the release of Gd2O3 nanoparticles in response to tumoral acidic pH. The CO2 bubbles and released Gd2O3 nanoparticles can serve as contrast agents for tumoral US and MR imaging, respectively. The Gd2O3-MNPs were prepared by block copolymer-templated CaCO3 mineralization in the presence of Ca2+ and CO32- ions, and positively charged Gd2O3 nanoparticles (mean diameter = 5 nm). TEM analysis showed that the mean diameter of the Gd2O3-MNPs was 344.4 nm. At physiological pH (7.4), the Gd2O3-MNPs did not show any noticeable contrast signals under an US field. In contrast, at tumoral pH (6.4), there were strong echogenic signals due to CO2 bubbles generation by the dissolution of CaCO3 minerals. In addition, at tumoral pH (6.4), the Gd2O3-MNPs would effectively release Gd2O3 nanoparticles into the aqueous environment, thereby resulting in a strong MR contrast enhancement. These Gd2O3-MNPs might serve as promising dual-modality contrast agents for US and MR imaging of various tumors.

Nicola Daldosso
University of Verona, Italy
Title: TiO2 coating of luminescent porous silicon by ALD technique for biomedical applications

Biography: Nicola Daldosso (PhD in Physics) is permanent Researcher in Experimental Physics at University of Verona (Italy) from 2011, where he leads the Fluorescence Laboratory. He is member of the School of applications of Nanomaterial and Nano technology for Medicine of University of Verona. His research interests include structural and optical properties of nanostructured materials (in particular nano-silicon) as well as erbium doped systems, and integrated optoelectronics (photonics) on silicon. He recently moved towards biomedical applications and nanomedicine. He is author of 108 publications and communications, co-author of 6 chapter books, and he holds 1 patent and h-index 24.

Abstract: Porous silicon (pSi) is a sponge-like material produced by electrochemical etching of crystalline silicon wafer. It is proved to be photoluminescent (PL) due to quantum confinement effect and this is fundamental for bioimaging applications. The pSi particles gained a lot of interest in biomedicine because they are inert, biodegradable, biocompatible and have no immune response. One of the main issues of pSi particles for biomedicine applications is the fast quenching of the optical properties in biological solutions. We previously demonstrated long-term optical stability by covalent attachment of polymers such as chitosan [1]. In this work, we demonstrate the optical stability of pSi particles in a biological buffer (e.g. PBS) by depositing an inorganic TiO2 coating by Atomic Layer Deposition (ALD) in a rotary reactor [2]. The ALD method results in the deposition of a uniform coating on the particles and enables a fine tuning of its thickness [3]. We investigated how the Ti precursor (TDMAT) and water vapour exposure time during ALD affect the optical properties of the pSi-TiO2 particles in biological buffer. By optimizing the ALD parameters, the PL of pSi particles stabilized more than three months (up to now) without significant effect on the morphology. Quantum yield determination gave similar result for coated and uncoated particles. In-vitro tests were performed to investigate whether the pSi-TiO2 particles affect the viability or the functional activity of human immune cells, as it was done for pSi particles without any coating [4]. We found that TiO2 coated particles in concentration up to 100 μg/mL did not exert toxic effects on human monocytes, lymphocytes and dendritic cells. We then performed ELISA tests to evaluate whether TiO2-pSi particles activate human dendritic cells inducing the release of the immunomodulatory cytokines IL-6 and TNF-alpha. For this purpose, dendritic cells were incubated with various TiO2 coated pSi particle concentrations, as well as with the well-known bacterial immune cells activator lipopolysaccharide (LPS), as a positive control. Preliminary results indicate that coated particles induce no or weak dendritic cell activation, but could potentiate the cytokine release induced by LPS (priming effect). Our results suggest that TiO2 coated pSi particles are not harmful for human cells, but their ability to increase the immune cell activation by other agonists must be taken into account for medical purposes. This result combined to the proved photoluminescence stability in biological buffers opens the way for them to be a promising material in NanoMedicine.

Zhao Liu
Shanghai Jiao Tong University, China
Title: Lightweight design of 3D woven composite fender using modified particle swarm optimizer

Biography: Dr. Zhao Liu is a doctoral student of Shanghai Jiao Tong University, China. The research topic concerns evolutionary optimization algorithm, multi-scale analysis and optimization of composite materials and multidisciplinary design optimization (MDO). Dr. Liu's honors include excellent graduating student of universities in Changsha in 2009, outstanding undergraduate of Hunan University in 2007, excellent student leader of Hunan University in 2007, "Three-Good" student of Hunan University in 2007 and 2008, National Scholarship in 2007.

Abstract: With the growing concerns on energy conservation and environmental protection, lightweight design for automobiles is becoming increasingly attractive in automotive industry. Generally, material replacement, structural optimization and the application of new manufacturing technology can be adopted in the lightweight design of a structure, in which material replacement is counted as the most effective approach. Composite materials have been employed to reduce the weight of the vehicle structure because of its low specific gravity, high specific stiffness and good impact strength compared to traditional materials. For an automobile, car fenders are regarded as an essential part protecting nearby components and the passengers to a certain extent in collision accidents. At the same time, fenders also should possess sufficient stiffness and strength to provide a support for other automotive exteriors, such as bump systems and lamps, when assembling. In consideration of the potential of carbon fiber reinforced plastic, some leading carmakers and researchers are trying to develop the composite fenders. Compared with metallic counterparts, the application of composite material introduces more challengs into the optimization procedure, such as the anisotropic material behavior and the large amount of continuum-discrete mixed design parameters. In this paper, a modified particle swarm optimization algorithm is investigated for solving the optimization problem of composite materials. Particle swarm optimization is an evolutionary algorithm which mimics the cooperation behavior among species like birds, fishes etc. The PSO algorithm is becoming very popular because of its simplicity of implementation and strong optimization capacity. However, premature convergence problem is also a serious issue for PSO similar to other evolutionary algorithms. It is generally known that diversity loss is one of the crucial factors. In order to improve the diversity of particles during optimization procedure, a modified PSO algorithm is proposed which an adaptive reset operator worked on velocity is incorporate into the standard PSO. The modified algorithm is compared with two standard versions of PSO and a modified PSO method with the single point mutation and single point crossover operators based on a set of benchmark functions. The experimental results demonstrate the priority of our proposed algorithm both in optimization ability and algorithm stability. Then the modified PSO algorithm is used to solve the optimization problem of three dimensional (3D) woven composites fender with discrete and continuous variables, aiming at the minimum weight structure in presence of buckling and post-buckling requirements.

Marius Sebastian Secula
Gheorghe Asachi Technical University of Iasi, Romania
Title: Photo-Fenton tests of iron (II)-embedded composites

Biography: Marius Sebastian Secula is with Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania (e-mail: mariussecula@ch.tuiasi.ro). His research interests are centered mainly in the advanced technologies for water and wastewater treatment, and in particular towards electrocoagulation, electrochemical oxidation, photocatalysis, Fenton processes and coupling processes such as UV/TiO2/Fe(III)/H2O2 or Electrocoagulation(EC)/GAC.

Abstract: The aim of this work is to investigate the efficiency of a cheap Iron-impregnated activated carbon Fenton like catalyst towards the photo-degradation of organic compounds in aqueous solutions. Indigo Carmine is considered as model pollutant. Different Advanced Oxidation Processes (AOPs) are evaluated for the degradation of Indigo Carmine (Fig. 1). The Iron(II)-embedded AC composite enhances significantly the degradation process of Indigo Carmine. AC was directly contacted with FeSO4 solution using wet impregnation method. Thermogravimetric analysis, Fourier transform infrared, X-ray diffraction, and transmission electron microscopy were employed to investigate the structural, textural, and micromorphology of the catalyst. Photo-catalytic tests were performed using an UV - Consulting Peschl Laboratory Reactor System. UV light irradiation tests were carried out to determine the performance of the prepared Iron-impregnated composite towards the degradation of IC in aqueous solution using different conditions (17 W UV lamps, with and without in-situ generation of O3; different concentrations of H2O2, different initial concentrations of IC, different values of pH, different doses of NH4-OH enhancer). These tests were conducted after the adsorption equilibrium has been established. The obtained results emphasize an enhancement of Indigo Carmine degradation in case of the heterogeneous photo-Fenton process conducted with an O3 generating UV lamp in the presence of H2O2.

André Luis de Jesus Pereira
Universidade Federal da Grande Dourados, Brazil
Title: Effects of High Pressure on the Optical, Structural and Vibrational Properties of  and -Bi2O3: an Experimental and Theoretical Study

Biography: PhD in Materials Science and Technology. Has obtained experience in the growth of semiconductor thin films, particularly pure and doped TiO2 and GaAs, by RF magnetron sputtering technique. Developed a Postdoctoral project in the Polytechnic University of Valencia (Spain). During this period, was performed a detailed study of the ABO4 type oxides and sesquioxides behavior under the influence of high pressure. Currently is Professor of the Grande Dourados Federal University (Brazil).PhD in Materials Science and Technology. Has obtained experience in the growth of semiconductor thin films, particularly pure and doped TiO2 and GaAs, by RF magnetron sputtering technique. Developed a Postdoctoral project in the Polytechnic University of Valencia (Spain). During this period, was performed a detailed study of the ABO4 type oxides and sesquioxides behavior under the influence of high pressure. Currently is Professor of the Grande Dourados Federal University (Brazil).

Abstract: Bismuth trioxide (Bi2O3) is an interesting material since it has potential for several promising applications. Its unique properties make the Bi2O3 a strong candidate for various applications like oxygen gas sensors, solid oxide fuel cells, photocatalysis, microelectronic and glass manufacturing [1]. Despite its industrial interest, scarce information is known about Bi2O3 at high pressures. In this work, we present a detailed experimental and theoretical study of the structural, vibrational and optical properties of -Bi2O3 and -Bi2O3 under pressure. Both materials have been compressed up to 45 GPa and their equations of state and pressure coefficient of the vibrational modes have been determined by angle-dispersive x-ray diffraction (ADXRD) and Raman scattering measurements, respectively. Additionally, the evolution of the optical bandgap of -Bi2O3 with increasing pressure has been determined by means of optical absorption measurements up to 26.7 GPa. Experimental results have been also compared to first principles total-energy calculations, carried out within the periodic density functional theory (DFT) framework [2]. The VASP package [3] was used to carry out calculations with the pseudopotential method and the projector augmented wave (PAW) [4]. Theoretical calculations suggest the possibility that -Bi2O3 undergoes several phase transitions below 10 GPa. However, ADXRD and Raman scattering measurements reveal only a pressure-induced amorphisation above 20 GPa, which was attributed to the inability of the  phase to undergo a phase transition to the HPC phase [5] at room temperature, as suggested by theoretical calculations. On the other hand, the combined analysis of both experiments and lattice-dynamics calculations suggest the occurrence of an isostructural phase transformations ( to ’ phase) at ~2 GPa in tetragonal -Bi2O3. This transition was related to an accommodation of the lone-electrons pairs present in the crystalline structure. We also find a considerable change of the indirect bandgap behavior in the  and ’ phases followed by a decrease of the indirect bangap above 15 GPa. Above ~20 GPa, the sample suffers an amorphization, like the -Bi2O3.

Tahar Abid
University of Constantine, Algeria
Title: Precipitation and Structural Hardening of Al-Mg-Si-(Cu) Alloys Sheets


Abstract: The main interest of this work is to understand the precipitation reactions in two AlMgSi(Cu) alloys sheets and to elucidate the effect of pre-aging, aging treatment and 0.10 wt % copper addition on the hardening response. To deal this, differential scanning calorimetry (DSC), vickers micro-hardness measurements and analysis transmission electron microscopy (TEM) characterization have been used. It is revealed that the existence of precipitates of type α-AlFeSi, α-AlFe(Mn)Si frequently present in the Al-Mg-Si alloys and remaining stable at high temperatures. It is also clear from this study that it is always possible to combine hardening property with intrinsic properties of a material. Indeed, the structural hardening caused by precipitation in studied alloys is certainly due to the predominance of very fine typical precipitates β' and β'' as rods and needles developed during aging with and without pre-ageing. The effect of pre ageing just after homogenization and quenching is to correct the undesirable effect of aging at ambient temperature by making faster alloy hardening during artificial aging. The addition of 0.10 wt % copper has allowed to refine and to enhance the precipitation hardening after quenching.

Huiwu Long
Chongqing University, China
Title: The bionic design towards gas-sensing nanomaterials

Biography: Huiwu Long received his B.S. from Chongqing University, China in 2015. He is currently a M.S. student in the College of Materials Science and Engineering, Chongqing University under the supervision of Associated Prof. Wen Zeng. His research focuses on “the bionic design of nanomaterials”, “gas sensors” and “green batteries”.

Abstract: The wide spread of the extremism causes frequent terrorist attacks in the whole world, among which the suicide bomb attack accounts for the vast majority. Because of its portability and mobility, the prevention in advance is usually aimless and the on-site detection becomes the last and also the most effective defense to the public security. Considering the volatility of explosives, gas sensors possess the potential to be applied in this field. However, the relatively low saturated vapor pressure of explosives also presents a new challenge towards gas-sensing materials. According to the oxygen-adsorbed model, the gas-sensing reaction actually depends on the outer surface of materials in touch with the target gas and the interface involving the transport of charge carriers. Therefore, the structure design of gas-sensing materials in the nanoscale plays a critical role in the property enhancement. Inspired by naturally-occurring structures discovered in the biosphere, some similar concepts were introduced to the construction of gas-sensing materials such as the blood circulation system and the web knitted by spiders. Distinct from the traditional material preparation, our work with a better purposefulness and controllability may contribute some beneficial exploration to the rational design of gas-sensing materials and can be extended to other fields.

Shadi Mirhashemi
University of La Rochelle, France
Title: Physicochemical characterization of calcareous deposit on polarised steel mesh for protection against coastal erosion

Biography: Shadi Mirhashemi has a PhD from University of Pierre et Marie Curie (Paris 6) on physical and analytical chemistry. During her PhD at Chimie ParisTech (PCS group), she has focused on corrosion protection of metals by ALD coatings. Being interested in electrochemistry combined with materials science, she is now working as a postdoctoral researcher at University of La Rochelle (LaSIE: Laboratory of Engineering Science for Environment), on electrodeposition and characterization of materials for coastal erosion protection.

Abstract: Coastal erosion is a phenomenon of increasing importance due to the factors like rising sea levels. Different techniques are applied for protection of coastlines against erosion, meanwhile the research continues for improving the existing methods or coming out with modern ones. A novel promising process licensed by the society of Géocorail SAS is presented in this work. Being inspired by cathodic protection techniques, this process takes advantage of the formation of calcareous deposit as a result of cathodic potential applied on metallic substrates in the seawater. Calcareous deposit can act as a binder between a metallic mesh and the natural elements present on the site (such as sediments, sand, shells, etc.) and therefore reinforce the coastline against erosion. Different parameters being studied on the mentioned process in our group and in collaboration with the partner groups1,2,3, other aspects are still under investigation. Among the several results, the features concerning the evolution of the calcareous deposit by time will be discussed in the present work. Furthermore, the effect of the addition of recycled concrete will be addressed by demonstrating the experiments under work. Various in-situ and ex-situ methods have been used in this work, including electrochemical techniques, Raman spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, thermogravimetric analysis, tomography and scanning electron microscopy. Combination of these methods allows addressing the mechanism of deposition and growth of calcareous layers, their composition under different circumstances and the role of several deposition parameters and environment.

Viorica Muşat
University of Galati, Romania
Title: ZnO-based 1D nanostructured transparent thin filmsobtained by full bottom-up approachfrom solution for electronic applications


Abstract: The paper focusses on optical and electrical characterization, as well as on some electronic and optoelectronic applications of ZnO and Al-doped ZnO 1D nanostructured thin films obtained byfull bottom-up approach. The nanostructureswere grownby hydrothermal method from aqueous solutions of zinc acetate or zinc nitrate and HMT, in the temperature range of 75-95oC, on glass and silicon substrates seeded by spin-coating or microcontact printing from ZnO coloidal disperson.The obtained ZnO and Al-doped nanowires were confirmed by TEM to be 1D single crystal with wurtzite structure preferencialy grown along the [002] crystallographic direction. ZnO and Al-doped ZnO 1-D nanostructures showed optical transmittance between 60-85% within the visible and the near infrared region and can act as anti-reflective coating with reduced reflectance based on the Moth Eyephenomenon.The electrical conductivity of the obtained nanostructures significantly depends on the aluminium doping concentration. 2 wt. % Al-doped ZnO nanostructured layer showed the best electrical conductivity of 140.9 -1cm-1. Transparent and conductive Al:ZnO 1D nanostructured thin films were demonstrated to increase the efficiency of silicon thin film-based photovoltaic devices. Key words: ZnO, Al-doped ZnO, hydrothermal synthesis, single crystals, nanorods array, antiriflective layers, transparent-conductive films, photovoltaic cells.

Suyan Shan
Wenzhou Medical University, China
Title: Highly targeted antitumor drugs from graphene based hybrids

Biography: Suyan Shan is currently a Master student at Laboratory of Nanoscale Biosensing and Bioimaging, School of Opthalmology and Optometry, Wenzhou Medical University. Her backgound is opthalmology and nanomedicine. Her research area focuses on the synthesis of high-performance nanoscale drugs for opthalmologic applications.

Abstract: Choroidal melanoma (CM) is one of the most deadly adult intraocular malignant tumors. Generally CM was dealt by clinical surgery. Secondary damage and even irreversible damage (e.g. loss of the eyeball) to the patients were inevitable. Chemotherapy has been considered as a more suitable alternative for therapy of CM. The traditional chemotherapy drugs, however, are suffered to pass through the so-called Corneal Barrier (CB) and targeted delivery ability to the tumor cells. In this work, we present our recent efforts on nanocarriers from polyethylene glycol modified hydroxylated graphene (PEG-GOH) which show superb performance on passing through the CB and targeted delivery towards OCM-1 cells (a typical cell line of CM). GOH with unique size and huge surface area was synthesized by our recently discovered edge-functionalized ball milling techniques. The as-synthesized GOH exhibited good ability to pass though cell membranes without any damage on cells. Particularly interesting, GOH tended to accumulate around tumor cells due to its slightalkalinity associated with-OH functional groups which were more attractive for the relatively acidic tumor cells than the normal cells. Furthermore, PEG was incorporated to further improve biocompatibility of the drug carriers and targeted ability towards tumor environment. Typical antitumor drug doxorubicin (DOX) was loaded onto the resulting PEG-GOH. For the purpose of comparison, normal ocular cells (ARPE-19) and tumor cells (OCM-1) were co-cultured in a Transwell assay with the addition of the as-prepared PEG-GOH/DOX. A 10% OCM-1 cell viability was obtained after 48 h while more than 50% ARPE-50 cells survived, suggesting excellent targeted suppressing ability of the resulting PEG-GOH/DOX towards tumor cells. This result was further confirmed by using an in vitro 3D tumor model which decreased two times more with PEG-GOH/DOX than that cultured with the pristine DOX.

Pijush Ghosh
Indian Institute of Technology Madras, India
Title: Hygromorphic transformation of biopolymer thin films

Biography: Pijush Ghosh works as an Associate Professor in the department of Applied Mechanics Department at IIT Madras. Dr. Ghosh completed his PhD from North Dakota State University, USA followed by postdoctoral research at Johns Hopkins University. He joined the current institute in 2011. The main focuses of his research group are stimuli triggered polymer thin films, nanomechanical characterization of multi-layered thin films, concrete polymer-film interface, etc. Both experimental work and molecular simulation (Molecular Dynamics) are performed in this research laboratory. (Lab Webpage https://home.iitm.ac.in/pijush/)

Abstract: Moisture responsive biopolymer films exhibits hygromorphic transformation into complex geometries which are utilized as biosensors and actuators. Self-folding is a prominent example of hygromorphism where the thin film folds due to inhomogeneous swelling across the thickness of the film. The hygromorphic behaviour of thin film is dependent on the polymer matrix and the solvent medium. Modifying the solvent medium assists in controlling the predictable pathway of self-folding performed by the thin film. Chitosan (CS) and Poly vinyl Alcohol (PVA) are considered as two different polymer matrices which exhibit reversible self-folding phenomenon. CS and PVA are different in terms of monomer structure, hydrophilicity and number of hydrophilic groups in the polymer backbone. PVA has a single hydroxyl group whereas CS has a hydroxyl group, an amine group and hydroxyl methyl group. Also, diffusion of water molecules in PVA matrix is slower than in CS matrix which makes the CS film to actuate faster in the presence of water medium. CS and PVA shows irreversible self-folding phenomenon by incorporating suitable aromatic alcohols (AA) in the solvent medium. Atomistic simulation technique is employed to explore the molecular mechanisms which lead to reversible and irreversible self-folding behavior observed experimentally. The conformation flexibility, segmental motion and hydrogen bond dynamics observed in the polymer/solvent systems assist in the transformation of reversible to irreversible self-folding. The hydrogen bonds between AA and CS alter the dihedral conformational flexibility of CS chains. This restricted conformational behaviour enhances the stiffness of CS chains which is responsible for irreversible folding. In case of PVA matrix, the hydrogen bond formation is between AA and hydroxyl group attached to the polymer backbone. This reduces the segmental mobility of PVA chains which in turn increases the stiffness of PVA chains. Thus, incorporation of AA in a hydromorphic polymer system enhances the stiffness of chains which causes irreversible shape change.

Sabata Jonas Moloi
University of South Africa, South Africa
Title: Capacitance-voltage measurements of heavily irradiated silicon diodes as a function of frequency

Biography: Dr Sabata Jonas Moloi is a young Solid State Physicist from South Africa and has been a Senior Researcher at the University of South Africa since the year 2010. His main research interests include defects in semiconductors, radiation damage on semiconductors and semiconductor device physics. He has several papers on this subject. He currently lecturers Waves, Solid State Physics and Electrodynamics theory at the University. He also has several masters and PhD students and is one of the responsible persons for constructing the Solid State Laboratory in the University of South Africa. 1

Abstract: Capacitance-voltage measurements were carried out on silicon diodes irradiated by 1 MeV neutrons to different fluencies. The measurements were carried out at different at different frequencies in an attempt to explain a longstanding arguments about anomalous capacitance-voltage behavior of the irradiated semiconductor devices. A main indication is that effects of frequency on the measurements are more pronounced at low radiation fluencies implying that the material gets quickly damaged at theses fluencies. At high radiation fluencies, however, the effect is negligible to show that the material becomes resistant to further damage. The results here are explained in terms of radiation induced defects that have properties that differ with different levels in the energy gap silicon material. Out of these defects, the ones that are situated at the center of the energy gap are responsible for radiation resistant and their densities increase with fluencies to convert silicon into relaxation material. In general, it is argued here that initial heavy radiation improves radiation-hardness of silicon. The argument is in agreement with that presented before on radiation-hardness of silicon by gold-doping. It is concluded in this work that neutron irradiation is similar to gold-doping and both generate defects that are responsible for relaxation behavior, hence radiation-resistant of the material.

Nahed El Mahallawy
German University in Cairo, Egypt
Title: Effect of Reflectors on the Productivity Rate of Solar Water Desalination Systems

Biography: Nahed El Mahallawy is a professor of Materials and Manufacturing since 1988. Presently at Faculty of Engineering and Materials Science, German University in Cairo. In 1982 she received The State Prize in Engineering Sciences from The Academy of Research and Technology, Egypt. She has been visiting professor in many research institutes in Texas, Gainsville, USA, Lausanne, Switzerland, Royal Institute of Technology, Stockholm, Berlin, Technical University Clausthal, Germany. The field of research is new materials, composites- mainly metal matrix composites-, materials for renewable energy- mainly solar energy-, and materials for biomedical applications- mainly magnesium alloys- as well as application of recent manufacturing techniques such as severe plastic deformation, rapid prototyping on the material and product properties. She has more than 180 international publications in conferences and Journals.

Abstract: Desalination of seawater is vital in several countries especially in Egypt, where water scarcity is a problem. Solar Desalination systems are based on solar energy which is a renewable source of energy. The present solar desalination system is based on boiling water using a solar concentrating unit which is a parabolic trough collector. The water vapour is then condensated in a condenser to obtain desalinated water. The objective of this work is to study the effect of reflector materials on the heating efficiency of the parabolic trough solar collectors. A group of materials have been selected and tested for their reflectivity. These materials were; (1) aluminum foil of thickness 6.2 μm, (2) aluminum foil of thickness 86.46 μm, (3) galvanized steel sheet, (4) copper sheet, and (5) stainless steel sheet. All sheets were 1mm thick. An experimental setup has been manufactured to examine the performance of the parabolic trough as a function of the reflecting surface of the trough. The experimental setup consists of an artificial sun, parabolic trough solar collector with an evacuated tube located in the focal point of the trough and a desalination unit. The parabolic trough concentrates the incident light on the evacuated tube, which consequently heats the heat pipe inside the tube that heats and evaporates the water in the desalination unit. The influence of the different reflectors on the desalination process, i.e. the reflectivity of the material and the productivity rate of fresh water, were examined. It has been found that both the material type and surface roughness affect the reflectivity and that the highest reflectivity was obtained by the aluminum foil of thickness 6.2 μm with lowest surface roughness. The aluminum foil gave the maximum rate of desalinated water.

Boubertakh Abdelhamid
Université les Frères Mentouri Constantine1, Algeria


Abstract: Transmission Electron Microscopy (TEM) investigations of melt spun Al-5%Cr-2%Zr (wt.%) ribbon reveal the presence Al13Cr2 and another chromium-containing spherulite-like particles. Selected area diffraction patterns (SAD) taken from the spherule-like particles exhibit five-fold symmetry. These spherulites have been observed in aged samples at high temperatures, too. Its presence at such high temperatures suggests that they are thermally stable. The measure of the thermal expansion coefficient has been carried out using a dilatometer. Differential scanning calorimetry (DSC) has been used to know the sequence of precipitation during heating cycle in these alloys.

Centre de Recherche en Technologie des Semi-conducteurs pour l’Energétique (CRTSE), Algeria
Title: Removal of copper and fluoride from mixed Cu-CMP and fluoride bearing wastewaters by electrocoagulation


Abstract: Treatments of fluoride (F), copper (Cu) and F-Cu from semiconductor-based silicon etching rinse baths by electrocoagulation (EC) using aluminum plate electrodes were investigated in this study. The effects of important process variables such as current intensity, initial pH and initial concentration on the removal efficiencies of F and Cu were evaluated. Removal efficiencies for F and Cu in the single system were found at about 99% at optimum operating conditions.The highest removal efficiencies were achieved at pH 3 for F and between pH 3 and 5 for Cu containing synthetic wastewaters. Experiments were conducted with different F/Cu ratio when Cu concentration was kept constant and F concentration was increased, the highest removal efficiency was observed at lower concentrations. EC study provided high removal efficiencies of F and Cu from semiconductor synthetic wastewater. Keywords: Semiconductor wastewater, Copper,Fluoride, Electrocoagulation.

Tarek Ali ElMelegy
British University in Egypt, Egypt
Title: Erosion resistance of protective coatings of wind turbine blades

Biography: Tarek Elmelegy currently works as a teaching assistant in mechanical engineering department in The British University in Egypt (BUE). He received his joint BSc with distinction first class honors in Mechanical Engineering from Loughborough University/BUE. He is currently pursuing postgraduate studies in The British University in Egypt in Materials Science with area of interest in polymer composites and erosion resistance of wind turbine blade structures. Professor Nabil El-Tayeb gained his PhD from Leeds University in Leeds, UK (1986), attended his MSc at Aston University in Birmingham, UK (1982), and received his first degree “BSc” distinction with honor from Helwan University-Cairo (1977). His current research interests lie in the Mechanical and Tribology of Materials (Tribological characterizations of polymers and their composites including synthetic and natural fibres), Tribological Design, Cryogenic Tribology and Machining, Mechanical treatment of non-ferrous and polymeric materials, Diagnosis of surfaces deterioration, Machinability of polymeric composite materials, and Applications of Statistic and Artificial intelligent approaches in experimental oriented researches for Tribo-systems. He has over 85 Research Publications in various prestigious International journals. Dr. Mostafa Shazly is an Associate Professor at the Mechanical Engineering Department, Director, Centre of Advanced Materials, the British University in Egypt. He received his B.Sc. and M.Sc. in Mechanical Design and Production Engineering from Faculty of Engineering, Cairo University in 1996 and 1999, respectively. He received his Ph.D. in Mechanical Engineering in 2005 from Case School of Engineering, Case Western Reserve University, OH, USA. Dr. Shazly received Case Prime Fellowship from Case Western Reserve University, OH, USA.

Abstract: In this study, experiments are conducted to study the erosion behavior of various coatings on glass-fiber reinforced epoxy polymer composite (GFRP) substrate by silica sand particles for applications of wind turbine blades. The effects on erosion rate of impingement angle (0°-90°), erodent velocity (20-80 m/s), coating types (2K acrylic-base, polyurethane-base, polyurea-base) and coating thicknesses (120-2000 µm), erodent size (300 µm) are investigated. Additionally, the results were statistically analysed using ANOVA and plotted using response surface methodology (RSM) to obtain in-depth understanding of significant factors affecting erosion. Moreover, predictive regression models were generated in the form of equations and contour plots to estimate erosion responses at various factor combinations. Results show that elastomeric coating application on GFRP substrate can lead to reduction in erosion rate of up to more than 96% compared to uncoated GFRP. However, at other parameter combinations, an increase in erosion rate of about 4.5% due to coating is noted. Additionally, the application of coating on GFRP at certain parameter combination leads to change in erosion peak behavior from lower angles of 30° to around 45°. This constitutes a transition of erosion mechanism from ductile to semi-ductile behavior. This transition may be attributed to the coating formulation as well as testing conditions. In fact, at other parameter combinations, erosion behavior of coated samples remains unchanged compared to uncoated GFRP.

Neeraj Mishra
I.S.F. College of Pharmacy, India
Title: Surface modified microparticulate carriers of Embelin for their beneficial Pharmacological potential in ulcerative colitis


Abstract: Present study was aimed to developed enteric coated microsphere of Embelin and their pharmacological potential was investigated in acetic acid induced ulcerative colitis. The optimized formulation of embelin loaded microspheres has shown significant sustained release of embelin. Further this formulation significantly reduced the ulcer activity score, oxidative stress and attenuates the inflammatory changes. Thus it may be concluded that embelin loaded enteric coated microparticles has shown delayed release capacity than plain Embelin and exerts colon ulcer protective effect in rats. Key words: Multiparticulate carrier, pH dependent, Colon, Time dependent, Eudragit S 100

Mohsen Golzarshahri
Isfahan University of Technology, Iran
Title: Effect of secondary phase precipitations on thermo-mechanical behavior and microstructural evaluation of ultrafine/nano structured stainless steels


Abstract: Effect of secondary phase precipitations on thermo-mechanical behavior and microstructural development of ultrafine/nano structured stainless steels during thermo-mechanical process were investigated. The repetitive cold rolling and subsequent annealing were conducted to achieve nanocrystalline structure in AISI 321 and AISI 304 stainless steels. Heavily cold rolling at −20°C was conducted to martensite formation in metastable austenitic steels. The process was followed by annealing treatment at 700–850°C for 0.5–30 min. Structural transformations were analyzed using feritscope and X-ray diffractometer. Microstructural evolutions were studied by optical microscopy (OM), scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). Energy dispersive spectroscopy (EDS) was applied to identify secondary phase modality. The mechanical properties were determined by hardness (Vickers method) and tensile tests. Results indicated that more thickness reduction makes more martensite formation in both steels. However, titanium carbide precipitations in AISI 321 stainless steel as secondary phase cause martensite to form at lower deformations in comparison with the AISI 304 stainless steels. Furthermore, it was observed that these precipitates retard the grain growth rate in the course of annealing. Discordance in grain growth during heat treatment causes to bimodal grains formation in AISI 321 steel. Keywords: Austenitic stainless steel, deformation induced martensite, nano/ultrafine grain structure, Olson – Cohen theory, Hall-Petch relationship.

BLAOUI Mohamed Mossaab
Universté Djillali Liabes de Sidi Bel Abbes, Algérie
Title: Grain growth Kinetic during austenitization of 100Cr6 and X20Cr13: NUMERICAL STUDY.


Abstract: A numerical investigation of effect of austenitization on kinetic grain growth of 100Cr6 steel grade is performed based on an empirical model. The austenitization temperatures used in this investigation were 900 ° C., 950 ° C., 1000 ° C., 1050 ° C., 1100 ° C. and 1200 ° C. with three holding times of 10 min, 30 min and 60 min to study the effect of the austenitization temperature and the holding time on the grain growth. The results shows that the austenite grain size increases with austenitizing temperature and holding time with different rate. Experimental results of ERIK PERSSON are used in order to compare them with the numerical results obtained. the predicted grain sizes by the model are in good agreement with exiperimental results. On the other hand, this model has been applied to the X20Cr13 steel and compared with100Cr6 steel to show the effect of the alloying elements on the austenitic grain growth.of brittle carbon fibers.

Mahdi Dadfar
Isfahan University of Technology (IUT), Iran
Title: Surface and corrosion properties of modified passive layer on 304 stainless steel as bipolar plates for PEMFCs

Biography: I, Mahdi Dadfar, am a PhD student at Isfahan University and technology which is one of the most prestigious universities in Iran. My PhD thesis is “surface modification of 304SS to improve corrosion resistance and electrical conductivity of bipolar plates used in PEMFC’s. I finished this work at University of Milan with Prof. S. Trasatti who is ahead of NACE group in Milan. This article is a part of my thesis and I would like to share my experience in this regard with other people.

Abstract: In this study, surface modification of 304 stainless steels (304SS) and its relation to corrosion properties was investigated. In this regard, plasma nitriding was performed on 304SS at two different temperatures, i.e. at 420 °C (low) and 520 °C (high). Then, thermo reactive deposition (TRD) was used in a mixture of ferro niobium, alumina and ammonium chloride. Finally, a pickling treatment was done to access high corrosion resistant surfaces. Surface treated samples, both before and after pickling, were characterized by using Scanning Electron Microscopy (SEM) and Potentiodynamic (PD) techniques. X-ray Photoelectron Spectroscopy (XPS) was performed for investigation of the surface layers after pickling. XPS proved the presence of atwo-phase structure film at surface. By these results, it can be concluded that passive films of modified samples have a more homogenous structures at surface for plasma nitrided samples at low temperatures than those plasma nitrided at high temperature. It was also shown that the surface layers were mostly comprised of iron oxide and hydroxides.

Joseph Assaad
Joseph Assaad, Lebanon
Title: Use of acrylic-based bonding agents to improve interfacial strength during multi-layers casting of highly flowable concrete

Biography: Dr Joseph Assaad is Professor of Civil Engineering; he earned his Ph.D from Sherbrooke University, Quebec, Canada. His research interests include grinding aids and strength enhancers for clinker, reduction of CO2 emissions during cement production, chemical admixtures for specialty concrete such as SCC, UWC, RAC, HPC, LWC, RCC, etc., injection materials, rheology and thixotropy, formwork pressure, bond to reinforcing steel, composite cementitious systems containing polymers and specialty chemicals, polymerisation of polyvinyl alcohols and styrene butadiene polymers, epoxies for flooring, and hardened concrete properties and durability. Dr Assaad received several local and international awards in the field of cement and concrete technology.

Abstract: The use of self-consolidating concrete (SCC) considerably increased over the past years in the construction industry; this type of highly flowable concrete flows under its own weight (i.e., without external vibration) to fill complicated shaped and congested formworks. SCC is typically proportioned to exhibit fast recovery rates, which improves material stability and resistance towards sedimentation of coarse aggregates. Fast restructuring can also be beneficial to reduce the lateral pressure developed on vertical formworks. Nevertheless, SCC exhibiting fast recovery is very sensitive to delays or stoppages during the placement process, which could limit its use during multi-layers casting of horizontal and vertical elements. In fact, if the concrete builds-up its structure too fast and apparent yield stress exceeds a critical value, successive layers would not be re-mixed with each other, especially that vibration is prohibited during SCC placement. This consequently creates cold joints that are visible after formwork removal together with weak interfaces that hinder the integrity of final structure and jeopardize the attributes normally associated to SCC during construction works. This paper is part of a research project initiated to quantify the consequences of high SCC recovery rates on construction practices such as energy needed for transportation and agitation, pumpability, blockage in pipes due to eventual stops during pumping, formwork pressure, and multi-layers casting in horizontal and vertical elements. It mainly seeks to evaluate the viability of acrylic-based polymers including styrene butadiene rubber (SBR) latexes to function as bonding agents during successive casting lifts. Different SCC mixtures were cast in two layers in 300x300 cm2 slabs, while the relative delay between cast layers was either 60 or 120 minutes. Test results have demonstrated that SBR applied at coverage rates hovering 1 to 3 kg/m2 can be quite efficient to minimize the detrimental effect of fast recovery on drop in interfacial bond strength. Such data can be of particular interest to researchers and concrete practitioners dealing with SCC-technology to appropriately tailor mixture proportioning and apply suitable practices during placement to maintain integrity of final structure.

Djillali libaes Univeristy of Sidi Bel abbes, Algeria

Biography: Imane Elmeguenni, PhD student in mechanics and systems design, in Laboratory of Materials and Reactive Systèms, (Algeria), ,holder of a master's degree in MECHANICAL ENGINEERING, option:Optimization of production systems and license degree in mechanical engineering at Djillali libaes Univeristy of Sidi Bel abbes, Algeria.

Abstract: Since the invention of Friction Stir Welding (FSW) in 1991 by The Welding Institute (TWI), the industries have been investigating the possibility to use this process instead of riveting. The Friction Stir Welding (FSW) is a solid state welding process, without melting.The weld is fabricated thanks to the action of the tool made of a shoulder and a pin, positioned at the interface of the two pieces to be welded. The tool as two roles: heating of the material by friction of the shoulder, plastic deformation and mixing of the material due to the pin. This relatively new process is currently the subject of active research. The present study focuses on numerical analysis of stress and strain fields due to the effort generated from the pin tool of friction stir welding, then appreciate the temperature distribution in joint welded by the finite element method using the ABAQUS software. The numerical results have shown how fields of stresses and plastic deformation in the weld joint FSW seem to describe successfully the change in the state of the material (solid-state mixing state) taking into account the mechanical action of the tool. Keywords: Welding FSW, generated effort, Plastic deformation, temperature

Abdelwahab zerrouki
University of Sidi-Bel-Abbes, Algeria
Title: FE modeling of mixed-mode crack initiation angle in HDPE


Abstract: In thispaper, anumericalanalysiswerecarried out using a High densitypolyethylene (HDPE). Sheetswith an initial central crack (CCT specimens) inclinedwith a given angle are investigated and compared to the loading direction. The kinking angle isevaluatednumerically as a function of the strainenergydensity (SED) around the crack-tip, using the AnsysParametric Design Language (APDL). Thenumericalanalysis, the plan of crack propagation isperpendicular to the loading direction. Moreover, as suggested by Sih in the framework of linearelastic fracture mechanics (LEFM), the minimum values Sminof the factor S are reachedat the points corresponding to the crack propagation direction. Theseresultssuggestthat the concept of the strainenergy- density factor canbeused as an indicator of the crack propagation direction. Keywords : Strainenergydensity; mixed mode; HDPE; crack initiation

Ali Fazili
Materials and Energy Research Center, Iran
Title: Effect of milling on sintering behavior and mechanical properties WC-Al2O3 composite prepared by spark plasma sintering


Abstract: In this study, the effect of milling on the sintering behavior of tungsten carbide-alumina composite was investigated by spark plasma sintering method. Raw materials (WC+ 6Wt%Al2O3) were milled for 1, 2 and 4 h. Then the powders were sintered in the optimum temperature of 1600 ̊C at a temperature rate of 50 ̊C / min and soaking time of 4 minutes and the pressure of 20 MPa. Time and temperature charts in terms of displacement and displacement rate in terms of temperature were evaluated. The XRD analysis was indicated the WC phase peaks after sintering. . For investigating the morphology and microstructure of sintered samples, scanning electron microscopy (SEM) was used. Observations showed that during increasing of milling time, the powders oxidation occurred and gases released during sintering and porous microstructure obtained after sintering. Density for the samples with prepared from 1, 2 and 4 h precursors, were achieved 99.9%, 97.7% and 87% respectively. Also the best mechanical properties were for the sample sintered from 1h milled raw materials. Key: milling, sintering, mechanical properties, WC-Al2O3 composite.

BELAZIZ Azzeddine
Laboratory of Mechanics and Reactive Systems LMSR, Algeria
Title: Mechanical characterization of the bead welding Of high-density polyethylene (HDPE)


Abstract: High-density polyethylene (HDPE) is widely used for many years for pipes of industrial facilities. The range of applications was extended to construction industry: transmission of gas, water, sewage disposal... Among the consolidation process of pipes made from high-density polyethylene (HDPE), fusion welding or butt weld fusion is considered to be a widely used technique in the thermoplastics industry whereby the mechanical behavior of the weld may approach that of the initial materials. This study was devoted to the experimental study of the mechanical behavior of a HDPE structure welded by butt fusion welding technique solicited in traction. We are based on experimental tests that were performed to characterize the material studied, introduce the ductility of the welded section and see the effectiveness of the displacement speed and the welding parameters, namely the melting temperature relative to the dimension of the internal diameter of the pipe. Keywords: high-density polyethylene (HDPE), tensile testing, behavior, characterization, deformation.

Zineb maouadj
Université Djilali Liabès Sidi-Bel-Abbès, Algeria
Title: Mechanical and structural characterization of welded joints in high strength steel:

Biography: Zineb maouadj PhD student Mechanics and systems design udl sba Algeria at the LMSR laboratory

Abstract: The objective of this work is to propose an approach to analyze and better understand the influence of the welding stick electrode on the mechanical properties of a welded joint in high tensile steel (A510 AP) . The experimental study aims to characterize the tensile test material to determine the mechanical properties of the joint, the heat affected zone and the base metal, also, bend test that allows to the quality control, then, a hardness test to confirm the structural modifications, and finally an impact test to assess the impact strength of the welded joint and estimate the toughness in service conditions in order to obtain the values of tenacity through the calculation of the resilience. Keywords: welding; high tensile steel; ZAT.

Cherrad Djellal
University of Setif 1, Algeria
Title: Working current density effect on structural and morphological properties of as-electrodeposited Mo coatings


Abstract: In this study, we present a series of electrodeposited samples made at 1800 seconds for a large current density range of 275-650 mA/cm−2. Thick, bright and rough Mo coatings from aqueous electrolyte in an acid bath were obtained. XRD analysis and EDS spectrum have been used to confirm the dominance of Mo in our coatings. The crystal structure of deposits was slightly amorphous in nature but it belong to body centred cubic structure (bcc) Mo (110), (211) and (220) face. Although residual tensile stress was exhibited by lattice parameters, they still agreed well with the few existing works from literature on electrodeposited Mo. Surface top was observed at different zoom in order to deep inside the origin of Mo coating properties. Other discussions are made on grain growth, thickness/rate deposition, and roughness. Further discussions were devoted to inspire some relationships and correlations in the view of the solar cell application of our samples as bottom contact. Keywords: Electrodeposition, XRD analysis, EDS spectrum, Roughness, rate deposition, Surface morphology

Tohid Saeid
Sahand University of Technology, Iran
Title: Optimization of hybrid TIG-MIG welding parameters of 316L austenitic stainless steel, and a comparison study with MIG process


Abstract: In the MIG-TIG hybrid welding method, better quality and efficiency is achieved compared with MIG and TIG methods. Also, in hybrid method, MIG arc is more stable in the shielding atmosphere of pure argon gas. Therefore, in this study the effects of the TIG-MIG hybrid welding parameters on the apparent quality and the depth to width ratio of 316L austenitic stainless steel were investigated using Taguchi design of experiments (DOE). Then, the microstructure of hybrid weld yielded from the optimum parameters of Taguchi DOE were compared with MIG weld under equal heat-input condition. The results revealed that the most important parameter in the hybrid method to obtain the best apparent quality and the highest depth to width ratio is the distance between the two arcs and the MIG and TIG currents are the next parameters. In hybrid welding using optimum parameters, the weld depth to width ratio increased by 92% and welding speed by 56% with respect to ordinary MIG welds. In addition, the grain size and the HAZ width in hybrid welding was smaller than that in MIG processes due to higher cooling rate in the hybrid welding method.

Benkhettou Nour-Eddine
Title: A First-Principles Study of Half-Metallic Ferrimagnetism in Ti2FeZ (Z=Al, Ga, In) Heusler Alloys.


Abstract: Using density functional theory with the full potential-linearized augmented plane wave (FPLAPW) method, we study the structural, electronic and magnetic properties of Ti2FeZ (Z = Al, Ga, In) alloys with Hg2CuTi-kind alloys structure. These are half-metallic ferrimagnets. In addition to this, the total magnetic moments of Heusler alloys are Ti2FeZ agree with the rule Mtot = Ztot-18 Slater-Pauling with a gap energy 0.56, 0.60 and 0.64 eV in the spin down channel, respectively.

BRAHAMI Abdessamad
Université Djillali Liabè, Algeria
Title: The influence of geometric discontinuity on the fatigue behavior of aluminum alloys.

Biography: Young doctoral researcher in mechanical engineering, damaging option and reliability of structures, Abdessamad BRAHAMI particularly interested in material fatigue, experimental study and numerical modeling. He’s graduated with a bachelor's degree in Productics and then a Master's degree in optimization of production systems at the University of Djilali Liabes of Sidi Bel Abbes. He worked as a technology engineer in an Algerian-Finnish company. Currently, he is working on a thesis project on the corrosion of aluminum alloys. He has participated in five international conferences. He supervised 2 students in bachelor's degree and 2 Master students.

Abstract: This study allowed us to see the influence of geometric discontinuity namely defects or cracks in the aluminum alloys (7075-T6 and 6082-T6), on the fatigue behavior, in other words life using the criteria of fracture mechanics using Ansys finite element code. This discontinuity has multiple internal or external origins resulting from improper design, imperfect implementation or from misuse. This work was performed by simulations on uninterrupted, hole and cracked specimens. Thereafter, the study has allowed to characterize the singularity of the stress field on crack tip by calculating the J-Integral.

Hessamoddin Moshayedi
Islamic Azad University, Iran
Title: Effects of Welding Residual Stresses and Warm Pre-Stressing on Brittle Fracture of a Pressure Vessle Containing an Internal Semi-Elliptical Crack


Abstract: Residual stresses (RS) due to welding process, may change the load bearing capacity of cracked components. These stresses can also affect the benefit of warm pre-stressing (WPS) cycles which are used for improving structure behavior. RS are obtained from a two-passes welding simulation of a ferritic pressure vessel and verified by experiments. A semi-elliptical internal crack at the weld line is considered. Redistribution of RS field after introducing the crack shows a significant tensile RS are remained at the crack tip. Two common WPS cycles, load-cool-fracture (LCF) and loadunload- cool-fracture (LUCF), are applied using the model at room and low temperature subjected to axial loading. Using local approach to fracture and R6 method shows that welding RS dramatically raise the fracture probability. LCF has more influence on reducing the fracture probability in comparison with LUCF. The interaction of welding RS and WPS cycles still improves the fracture properties, however, welding RS cause to decrease the benefit of WPS. Comparing RS distributions on crack-tip shows that applying WPS cause to release a significant amount of welding RS and therefore, WPS can be very useful for welded structures. The near crack-tip opening stresses at a same fracture load are further studied for all cases. Keywords: Welding Residual stresses, Warm pre-stressing, Brittle fracture Surface cracked pressure vessel.

kaid mustapha
Université DjillaliLiabes Sidi bel abbès, Algeria


Abstract: The objective of this thesis is the mastery of the technique of friction stir welding (FSW) and parameter optimization on a high density polyethylene (HDPE). This assembly method is based on the phenomenon of mixing caused by the passage of the tool (pin), a key element of this technique. The work will include: 1. Perform welding by FSW process. 2. Studying mechanical fracture behavior of welded joints. In order to control and optimize the process by mastering the rotational speed, advance and diving of the tool.3. Achieve butt welds and make a comparison between the two welds

Gianina Andrea Kloster
Universidad Nacional de Mar del Plata–CONICET, Argentina
Title: Synthesis and characterization of nanocomposites based on alginate and magnetic iron oxides.

Biography: My name is Gianina Kloster and I live in Mar del Plata, Argentina. I studied Chemical Engineering at the University of Mar del Plata. A year before graduating I was awarded an advanced student scholarship by the UNMdP and thus I started to participate in some research activities. In that moment I realized I really like working in the area of nanoscience and nanotechnology and therefore, I applied for a 5-years research fellowship. Since 2014 I am carrying out PhD studies at the National Institute of Science and Technology Research of Materials (INTEMA), funded by the National Council of Argentina. I am currently working on the synthesis and characterization of nanocomposites based on chitosan and/or alginate and iron oxide nanoparticles.

Abstract: The use of polymers in combination with iron oxide nanoparticles has been of tremendous interest in the last years due to the applications that those materials could have in different areas such as biomedicine, biotechnology and materials science, among others. Specifically, these systems could be used in targeting drug carriers [1], hyperthermia local inductors for cancer therapy [2], pollutant removal [3], biosensors and magnetic cell separators [4]. The use of biopolymers derived from the biomass such as alginate have attracted special attention because the several advantages that are incorporated to the final material: biodegradability, biocompatibility, use of renewable resources with the consequent decrease in the environmental impact, etc. The synthesis method used to obtain the nanoparticles and films significantly affects the final characteristics of the material and therefore its potential applications. The way of synthesis is very important in order to obtain the correct size of iron oxide particles (MNP) because this fact will affect the behavior of the composites obtained. In this study the preparation and characterization of nanocomposite films based on alginate/MNP varying the content of iron oxide, is presented. Nanocomposite films were prepared by casting of mixes of alginate film forming solutions with selected amounts of MNPs obtained by the alkaline co-precipitation method [5]. The nanocomposites were physical, chemical, mechanical and magnetically characterized. The successful incorporation of magnetite into the films was corroborated by the analysis of the x-ray diffraction patterns of the composite samples. Regarding mechanical behaviour, it was found that the tensile modulus and strength increases, while the elongation at break is almost not affected by MNP content. Moreover, all the nanocomposites present superparamagnetic behaviour with blocking temperatures below to room temperature, which can related to the small size of the magnetic particles / agglomerates included in the samples.

Esra Maltas Cagil
Selcuk University, Turkey
Title: A new drug delivery system based on magnetic calixarene nanoparticles

Biography: Dr. Esra Maltas Cagil is working at Department of Biochemistry in Selcuk University in Turkey. She received her M.S degree from Chemistry and PhD degree from Biochemistry. She has studied on protein-drug interaction, nanobiotechnology and tissue engineering. She has got many project, publications and conference proceedings about nanotechnology.

Abstract: The design and synthesis of macrocyclic compounds in supramolecular chemistry has been attracted attention among researchers. An innovative perspective in pharmaceutical and biotechnological fields has been gained by the design of supramolecular systems for the delivery of bioactive compounds [1,2]. Supramolecular approaches have been applied to drug delivery systems [3]. Different generations of synthetic macrocycles, i.e., cyclodextrins, calixarenes (CAs), cucurbiturils, and pillarenes (or pillar[n]arenes), have been employed for the construction of new drug delivery systems [4]. The calixarenes, a well-known family of macrocyclic oligomers or oligophenols display interesting organizing properties for the building of various ligating sites to recognize various species including anions, cations and neutral molecules having unique three dimensional shapes and complexation ability [5-7]. We was designed new drug carrier platform based on a magnetic calixarene nanoparticles for drug delivery. For this purpose, a calixarene derivative was used for doxorubicin loading. The calixarene derivative called as compound 6 was synthesized and bounded to [3-(2,3-epoxypropoxy)propyl]-grafted Fe3O4 nanoparticles (SPIONs) by using potassium carbonate in acetonitrile in order to produce a magnetic platform as drug carrier. Then, doxorubicin (DOX) was loaded to this calixarene nanoparticles (CALIX-SPIONs) in Tris buffer of pH 7.4 at a nanoparticles concentration of 5-30 mg. The release studies of DOX were done by using different buffer with, 2.2; 4; 6 and 7.4 of pH. The binding amount of DOX was estimated by using fluorescence spectroscopy. The binding studies was confirmed by Fourier transform infrared spectroscopy (FTIR) experiments, SEM, EDX and TEM analysis. Calixarene based magnetic nanoparticles was succesfully designed as a drug carrier platform.

Moshe Dariela
Ben-Gurion University of the Negev, Israel
Title: Effect of grain size on the static and dynamic mechanical properties of magnesium aluminate spinel (MgAl2O4)


Abstract: Transparent polycrystalline magnesium aluminate spinel with average grain size ( ) varying from 0.14 to 170 m were prepared by different sintering approaches. The effect of grain size on the flexural strength , hardness and Hugoniot elastic limit (impact loading) was investigated. It was found that values for samples with grain size in the 0.14 to 15 m range were almost equal to the dynamic yield strength values, estimated based on . This led to the assumption that the onset of inelastic deformation at HEL was brittle rather than ductile. The observed departure of the dynamic yield strength from the value for ceramics with grain size >15 m was associated with either impact-induced shear banding or twinning. The feasibility of such banding/twinning intervention in initiating inelastic deformation in the spinel is supported by the values of apparent Hall-Petch coefficients in the corresponding grain size domains. The present work focuses on understanding the nature of variations in the compression-related strength characteristics, namely micro-hardness and dynamic yield strength with the grain size and its influence on the Hall-Petch coefficients.

Tarek Ali ElMelegy
British University in Egypt, Egypt
Title: Erosion resistance of protective coatings of wind turbine blades

Biography: Tarek Elmelegy currently works as a teaching assistant in mechanical engineering department in The British University in Egypt (BUE). He received his joint BSc with distinction first class honors in Mechanical Engineering from Loughborough University/BUE. He is currently pursuing postgraduate studies in The British University in Egypt in Materials Science with area of interest in polymer composites and erosion resistance of wind turbine blade structures.

Abstract: In this study, experiments are conducted to study the erosion behavior of various coatings on glass-fiber reinforced epoxy polymer composite (GFRP) substrate by silica sand particles for applications of wind turbine blades. The effects on erosion rate of impingement angle (0°-90°), erodent velocity (20-80 m/s), coating types (2K acrylic-base, polyurethane-base, polyurea-base) and coating thicknesses (120-2000 µm), erodent size (300 µm) are investigated. Additionally, the results were statistically analysed using ANOVA and plotted using response surface methodology (RSM) to obtain in-depth understanding of significant factors affecting erosion. Moreover, predictive regression models were generated in the form of equations and contour plots to estimate erosion responses at various factor combinations. Results show that elastomeric coating application on GFRP substrate can lead to reduction in erosion rate of up to more than 96% compared to uncoated GFRP. However, at other parameter combinations, an increase in erosion rate of about 4.5% due to coating is noted. Additionally, the application of coating on GFRP at certain parameter combination leads to change in erosion peak behavior from lower angles of 30° to around 45°. This constitutes a transition of erosion mechanism from ductile to semi-ductile behavior. This transition may be attributed to the coating formulation as well as testing conditions. In fact, at other parameter combinations, erosion behavior of coated samples remains unchanged compared to uncoated GFRP.

Nathir Al-Rawashdeh
Jordan University of Science & Technology, Jordan
Title: Graphene oxide/Zinc oxide Composites as Photoanodes for Dye-Sensitized Solar Cells

Biography: Prof. Al-Rawashdeh received his Bachelor and Master degrees from Yarmouk University-Jordan, and Ph.D. degree from Georgetown University, Washington DC, USA, in 1997. He has been a Faculty member at Jordan University of Science & Technology since 1997 and on leave from 2009-2014 at United Arab Emirates University. He has received an award of the Ministry of Higher Education and Scientific Research of Jordan for the Distinguished Research Paper of 2009, Fulbright scholarship, DFG and DAAD research scholarships. He has published over 50 refereed journal and two book chapters. His current research interests are in the areas Material Sciences, such as Self-Assembled Monolayers (SAMs), and Corrosion, solar energy conversion.

Abstract: Graphene-based materials, already brings brand new opportunities, and it may further improve the Dye-Sensitized Solar Cells (DSSC) photoanode, reduce the DSSC cost, and set a new record of energy conversion efficiency in solar energy applications. The properties of graphene-based materials are highly dependent on the sizes, thickness, and surface conditions, thus the controllable synthesis of graphene materials with tunable morphology and adjustable properties is highly desirable but still challenging. In the present work, graphene oxide (GO)/zinc oxide (ZnO) nanocomposites (GZn) with different ZnO morphologies were prepared using a simple hydrothermal method and its application as a photoanode for DSSC was investigated. The ZnO morphologies such as nanodisk, nanorods, spindles and nanoflowers were obtained by adjusting the pH of the solution. The synthesized composites were characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD) which indicated that the ZnO nanoparticles are adorn on the surfaces and the interlayers of the graphene oxide sheets. The spectrophotometric study showed that the synthesized GZn nanocomposites has significant visible light absorption. The DSSC performance using the synthesized photoanodes was investigated in 0.6 M sodium sulfate electrolyte. The results of this study showed that the morphology of the ZnO nanoparticle has a crucial effect in the efficiency of the DSSC; the highest value of a power conversion efficiency of 5.10% for nanoflowers like morphology was obtained, due to high surface area. The current voltage (I-V) and capacitance voltage (C-V) characteristics of the synthesized films were investigated.

Dipika V. Raorane
Ramnarain Ruia College, India
Title: Green And Rapid Synthesis Of Tio2 Nanoparticles And Their Characterizations For The Application In Light Curing Nanocomposite Resins As Fillers

Biography: Ms. Dipika V. Raorane has completed her M.Sc. in 2015 years from University of Mumbai and now doing Ph.D. studies in Chemistry from University of Mumbai. She is the lecturer at graduate and post-graduate level, in Ramnarain Ruia College, Matunga, India. Her work of interest is Synthesis of metal nanoparticles and their applications.

Abstract: From past till now, there has been a continuous development going on in the field of restorative dentistry. We were having silver amalgam, then we came up to macrocomposites and now we are having nanocomposites in the picture were nanoparticles are mixed into the resin matrix. The aim of our work is to synthesize Titanium nanoparticles in a green and rapid way that can be used as fillers in light curing dental restorative nanocomposite materials. Annona squamosa fruit peel extract is used as a solvent in the synthesis of NPs. The surface modification of green synthesized TiO2 nanoparticles will play its role to build up physical adhesion and covalent linkage of inorganic fillers and resin matrix. In addition to it, C=C functional group of modified nanoTiO2 takes part in polymerization process while curing. It shows that increase in filler content increases the mechanical properties of resin material significantly like Compressive strength, Flexural strength, Elastic modulus. Polymerization shrinkage decreases when compared with the resin material with no filler content. Characterization is also done among light curing resins available in markets and same resins after addition of modified TiO2 nanoparticles and the results show enhancement in dental properties after addition of modified nanoparticles. TiO2 are white in color, self-cleaning, and antimicrobial in nature. Antimicrobial and antioxidant properties of plant extract are then added to the final material. This can lead to the development of new commercial material in the field of restorative dentistry having aesthetic properties, biocompatible nature with great potential for treating tooth decay and its prevention.

Marcilene Cristina Gomes
Instituto Federal de São Paulo – IFSP, Brazil
Title: Preparation and Characterization of Mn Doped TiO2 Nanoparticles Using the Pechini Method: Evaluation of the Photocatalytic Potential

Biography: PhD in Materials Science and Technology. Has obtained experience ab initio theoretical calculation based in the DFT using the CRYSTAL09 and 14 package. Is chemistry professor in the São Paulo Federal Institute – São José dos Campos. Currently, is in a technical collaboration in the Grande Dourados Federal University (Brazil), working the MaFER research group.

Abstract: In past years, many research groups have devoted much effort in the development and upgrading of new technologies that are harmonic with the environment, ecologically clean, safe and sustainable. The photocatalysis, which uses the abundant, clean and renewable solar energy, is one of the technologies that have presented the most advances in this direction [1]. Semiconductor oxides have drawn the interest as photocatalysts, especially, the titanium dioxide (TiO2), which has been commonly investigated in the degradation of different dyes under ultraviolet (UV) irradiation. However, due to its wide gap energy (3.0 - 3.2 eV), the photocatalytic performance of TiO2 becomes low in the region of the visible spectrum, hindering its practical application under natural light irradiation [2]. In this way, the development of novel materials (or even the improvement of the traditional materials) exhibiting good photocatalytic activity in the UV and visible region has increased [2]. In this context, in order to optimize the properties of TiO2 and, consequently, its efficiency in photodegradation processes under UV and visible illumination, we present herein a systematic study on the synthesis and photocatalytic activity of pristine and Mn-doped TiO2 nanostructures, i.e., Ti1-xMnxO2 solid solutions. The Ti1-xMnxO2 samples were prepared using the polymeric precursor method. For evaluation of the citric acid concentration influence in the properties of TiO2 nanoparticles, we investigated three molar ratio (2:1, 3:1, and 4:1) of citric acid and Ti-IV isopropoxide used for obtaining the titanium citrate. Additionally, we investigated the effect of Mn addition on the TiO2 properties, doping with four Mn concentration: 0.2%, 0.5%, 1.0% and 2.0%. To attain these objectives, the samples were characterized by using X-ray diffraction analysis, Raman spectroscopy, and UV-Vis absorption spectroscopy, besides the evaluation of the photocatalytic potential by the photodegradation of the rhodamine B dye under UV and visible light. For understanding of the experimental results, ab initio theoretical calculations based in the DFT were performed using the CRYSTAL14 package [3].

Mahshid Maroufkhani
Amirkabir University of Technology, Iran
Title: Characterization of nanocomposites based on polylactide (PLA), acrylonitrile butadiene rubber (NBR) and nanoclay: Effect of ACN content upon micromorphology and mechanical properties

Biography: Mahshid Maroufkhani was born in Iran in 1987. She received the B.Eng and Ph.D. degrees from Amirkabir University of Technology, Tehran, Iran, in 2009 and 2017, respectively, and M. Sc. degree (with honors) in polymer engineering from Tarbiat Modares University, Tehran, Iran in 2011. She has been a visiting student at Washington State University, Pullman, USA (2015-2016). Her main areas of research interest are polymer blends, nanocomposites and rheology. She is currently a Senior Lecturer at the University of Qazvin, Qazvin, Iran.

Abstract: Polylactide (PLA) is a biodegradable and biocompatible linear thermoplastic polyester derived from renewable resources. PLA possesses excellent physico-mechanical properties combined with good processability and transparency. Nevertheless, it suffers from weak impact resistance and brittleness, hence needs to be toughened through blending with other polymers. Although numerous attempts have been made to toughen PLA through blending, the effect of polarity on the compatibility of the blends was less investigated. In the present study, toughened PLA has been prepared through melt blending with 4 wt% nanoclay (Cloisite 10A) and acrylonitrile butadiene rubber (NBR) via melt mixing process. To determine the effect of polarity on the micromorphology, phases miscibility and mechanical properties of nanocomposites, three grades of NBR with various ACN content were applied. Differential scanning calorimetry (DSC) characterization showed that crystallization of blends increased by the incorporation of nanoclay and nanocomposite based on 33% ACN NBR showed also higher crystallization than counterpart samples. Scanning electron microscopy (SEM) examinations revealed matrix-dispersed type of morphology for all nanocomposites and the size of rubber particles size reduced by decreasing the ACN content of NBR, indicating enhanced compatibility between PLA and NBR phases as a result of reduced interfacial tension as evidenced by contact angle analysis. The size of rubber particles showed to be smaller within the microstructure of nanocomposite sample than PLA NBR simple blend indicating residing of clay silicate layers in PLA matrix, leading to the decrease in the melt viscosity ratio of PLA and NBR. All nanocomposite sample exhibited significant improvement in mechanical properties with enhanced impact resistance as a result of reduction in the size of NBR particles. The impact strength of nanocomposite originated by low ACN NBR found to be higher as a result of higher interfacial compatibility between PLA and NBR than counterparts based on higher ACN NBR. Elongation at break of nanocomposites improved significantly by adding nanoclays for all NBRs, however the tensile strength of nanocomposites reduced compared to the simple blend.

Nadia Bachir
University of Tlemcen, Algeria


Abstract: Group III-nitride semiconductors AlN, GaN, and InN and their ternary alloys AlGaN, GaInN, and AlInN, have been studied extensively the alloy to match that of GaN or other desired values and vary the alloy composition to improve the structural, optical, and doping properties. Indeed, it has been shown experimentally that photoluminescence PL intensity in AlxInyGa1−x−yN quaternary alloys are strongly enhanced compared to that of AlGaN with comparable Al composition. In this work, we study the electric transport in the quaternary AlxInyGa1−x−yN compounds based on nitride, in the stationary mode, using the Monte Carlo method of simulation. because their band gaps cover a wide range from 0.7 to 6.1 eV, which makes them suitable for a variety of applications such as blue and ultraviolet UV light emitting diodes, laser diodes, and high-temperature, high-power eterostructure field-effect transistors. Recently, the quaternary alloys AlxInyGa1−x−yN have attracted much attention because; unlike in the other ternary alloys, the band gap and the lattice constant of the quaternary alloy can be individually tuned. For example, it is now possible to have the alloy lattice constant match that of GaN and simultaneously vary the band gap of the alloy. This is useful in reducing defects, misfit dislocations, and piezoelectric fields in band-gap engineering through, the formation of AlxInyGa1−x−yN/GaNheterostructures. On the other hand, one can also fix the band gap of We calculate the steady-state electron drift velocity for different mole fractions; finally, we compare the results with the ternary InxAl1-xN, InxGa1-xN and AlxGa1-xN alloys. Keywords: Quaternary nitride AlInGaN, ternary nitrides: Gallium Nitride (GaN) Aluminum Indium Nitride (InAlN), Aluminum Gallium Nitride (AlGaN), Aluminum Gallium Nitride (AlGaN), Stationary mode, Monte Carlo method of simulation.

Vytautas Samulionis
Vilnius University, Lithuania
Title: Ultrasonic and Photoacoustic Studies of Polymer Composites with Nanoparticles

Biography: Vytautas Samulionis graduated from the Faculty of Physics Vilnius University. He is Assoc. Prof., in Department of Radiophysics, Physics Faculty of Vilnius University. V. Samulionis is working in the field of high frequency ultrasound and electroacoustics. He is investigating the ultrasonic and piezoelectric properties and relaxation processes in semiconductors, ferroelectrics and polymers with organic and inorganic nanoinclusions. The photosensitive phenomena, such as photoacoustic attenuation, acoustoelectric voltage have been observed and described in photosensitive crystals. Investigations of ultrasonic harmonic generation were used in order to obtain information about elastic nonlinear properties of solid state materials.

Abstract: The polymer based nanocomposites have attracted increasing attention because of their unique properties emerging from the combination of organic and inorganic materials. In particular, nanoscale fillers such as carbon nanotubes or onion-like carbons were used to reinforce polymer matrices. Inorganic nanotubes, such as MoS2 can be also used for fabrication of various multifunctional composites based on polymer materials, because they exhibit piezoelectric and piezorezistive properties [1]. Ultrasonic spectroscopy allows to observe and evaluate relaxation processes that govern nanocomposites elastic behaviour and to reveal variation of these processes because of the change of the filler concentration [2]. In this contribution we present the temperature measurements of longitudinal ultrasonic velocity and attenuation in two types of polymer composites with nanoinclusions: polyurea elastomers with MoS2 nanoinclusions and polydimethysiloxane (PDMS) composites with onion-like carbons (OLC). Above the glass transition region the ultrasonic velocity dispersion and large ultrasonic attenuation maxima were observed in pure and doped composites. The positions of ultrasonic velocity dispersion and attenuation peaks were slightly shifted to higher temperatures after doping with OLC nanoparticles. This upshift of the glass transition temperature with addition of nanoparticles was attributed to attractive interaction between polymer and nanoparticles [3]. The increase of ultrasonic attenuation with increasing of OLC concentration was observed at room temperature and such behaviour was attributed to the ultrasound interacions with nanoparticles dispersed in polymer. In composites with carbons and inorganic nanoinclusions the increase of ultrasonic attenuation was observed after illuminating samples by white light using optical waveguide. Such photoacoustic phenomenon could be related to the ultrasonic interaction with nanoparticles of sufficiently higher temperature than polymer matrix.

Akbar Esmaeili
Islamic Azad University, Iran
Title: Optimization and preparation of Methylcellulose edible film combined with ofFerulagoangulataessential oil (FEO) nanocapsules for food packaging applications

Biography: Akbar Esmaeili has completed his Ph.D at the age of 47 years from Islamic Azad University, Tehran, Iran. He is the Prof. Department Chemical EngineeringNorth Tehran Branch,Islamic Azad University. He has published more than 100 papers in reputed journals, more 13 books, referee for more 100 paper’s and serving as three editorial board member of repute.

Abstract: The films based on methylcellulose with biodegradable and antioxidant activity incorporated with nano capsule suspension containing F. angulata essential oil were developed. Oil extraction and identification of F. angulata essential oil compounds was done. Nano capsule suspension containing F. angulata essential oil was prepared by ultrasonic bath. The films were prepared by a casting method in three different ratios. The mechanical properties, colour, light transmission, antioxidant activity and release rate characteristics of the films were studied. The addition of nano capsule suspension to methylcellulose films decreased the thickness, tensile strength but increased the percentage elongation at break (%E) and lightness. High antioxidant activity and a prolonged release of F. angulata essential oil were also reported. Five factors design of Response Surface Methodology were used to optimize the thickness, holding time and anti-oxidant effect of edible film based on methylcellulose incorporated with nano capsule suspension containing F. angulata essential oil. Design of experiments was carried out by the software: Minitab 17 (Sigma package). Optimization of thickness, 2, 2-diphenyl-1-picrylhydrazyl radical scavenging and holding time would yield the best mixture proportions of methylcellulose and nano capsule suspension 30%, 30% and 70%; oil. The films based on methylcellulose with biodegradable and antioxidant activity incorporated with nano capsule suspension containing FEO were developed.

Sara Qaisar
National Centre for Physics, Pakistan
Title: Effect of MWCNTs on the Arrhenius temperature dependence of PZT/PVDF nanocomposites

Biography: Dr. Sara Qaisar did her Masters in Chemistry from Quaid-e-Azam University, Islamabad, Pakistan in 1982. Thereafter, she joined a research organization where she served for more than two decades. She got a doctorate in Physical Chemistry from Quaid-e-Azam University in 2013. Her PhD research title was the development and characterization of piezoelectric composites. Part of this research was carried out at School of materials Manchester, UK. Dr. Sara Qaisar is presently heading the Nanosciences and Technology Department at National Center for Physics, Islamabad Pakistan. Her research interests are nanocomposites, piezoelectricity and electrochromic materials.

Abstract: The effect of the incorporation of MWCNTs in a 2-phase PZT/PVDF matrix was investigated by impedance spectroscopy in the mHz to MHz range, from room temperature to 160 ºC. Room temperature measurements at 1 kHz show that the addition of 0.01 weight % of MWCNTs enhances the relative permittivity of the base matrix giving a twofold enhancement. The ac conductivity of the PZT/PVDF nanocomposites and the 3-phase nanocomposites manifests two different Arrhenius temperature dependences with an inflexion point at 90 to 100 °C. The Energy of activation in the low temperature region is higher than that at higher temperatures implying that the conductive processes at higher temperatures are more viable. Although the trends in the ac conductivity versus temperature plots for the PZT/PVDF composites and the 3-phase nanocomposites are the same, but it is observed that the ac conductivity is higher for the 3-phase composites as compared to the 2-phase composites. The reason for the enhanced conductivity is attributed to the conductive nature of CNTs.

Leonid Rubinovich
Ben-Gurion University of the Negev, Israel
Title: Finite-size scaling of separation transitions in alloy nanoparticles: Modeling of size and shape effects on critical temperatures

Biography: Leonid Rubinovich is Research Associate at the Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva. He received his MSc Degree in Physics from the University of Tomsk (Russia) in 1976 and PhD (Alloy Physics, 1990) at the Institute of Strength Physics and Materials Science (Tomsk).

Abstract: Phase-separation second-order transitions in binary alloy particles consisting of ~1000 up to ~70000 atoms (~1–10 nm) are modeled focusing on the unexplored issue of finite-size scaling in such systems, particularly on evaluation of correlation-length critical exponents [1]. The statistical-thermodynamic approach is based on mean-field analytical expression for the Ising model free energy obtained by the free-energy concentration expansion method (FCEM) [2]. In order to cope with relatively large nanoparticles (NPs), the FCEM is combined with the coarse-grained layer model (CGLM) [3]. The model evaluates layer-by-layer “average concentrations”, thereby reducing significantly the number of concentration variables as compared to the fully atomistic FCEM. This facilitates highly efficient computations furnishing comprehensive data for fcc rectangular nanoparticles (NPs). The results are summed up in intra- and inter-particle scaling plots as well as in nanophase separation diagrams. Temperature-induced variations in the interface thickness in Janus-type intra-particle low T configurations and NP size-dependent shifts in the critical temperature of their transition to solid-solution reflect power-law behavior with the same critical exponent,  = 0.83. It is attributed to dominant interfacial effects that are absent in inter-particle transitions. Variations in  with nano-size, as revealed by a refined analysis, are linearly extrapolated in order to bridge the gap to larger particles within and well beyond the nanoscale, ultimately yielding  = 1.0. Besides these findings, the study indicates the key role of the surface-area to volume ratio as an effective linear size, revealing a universal, particle-shape independent, nanoscaling of the critical-temperature shifts.

Somayeh poorbafarani
Isfahan University, Iran
Title: The Effect of Alkali Concentration on the Structural and Magnetic Properties of Mn-Ferrite NanoparticlesPrepared via the Coprecipitation Method

Biography: Somayeh poorbafarani her two essays were the result of her experimental work at university lab during her M.A study and self study after graduation. The subject of the aforementioned essay and also the way of observing and analysing was a answer to all her questions which she had been involved in, while she hadn't found a clear and bright respond to them. After getting the results, she would be delighted to share the thoughts with the world

Abstract: Chemistry plays an important role in the development of novel nanostructural materials ,and a simple control of solution chemistry can lead to speific changes in crystallite properties. One of the chemical techniques in the synthesis of nanoparticles is coprecepitation.The advantages of using this method are that the structural and morphological properties of nanoparticles can be varied by controlling the chemical and physical parameters of the reaction medium such as the alkali concentration, reaction temperature, molar ratio of salts, ionic strength of aqueous medium, and reaction time. In this work, MnFe2O4 nanoparticles were synthesised using the coprecipitation method under two different NaOH concentration settings as reaction agents at 355 K (82 C). Structural and morphological properties of the nanoparticles were examined using X-ray diffraction and a scanning electron microscope. The decrease of NaOH concentration led to the increase of particle size, more crystallinity and a narrower particle size distribution. The results were evaluated from a chemical point of view and were based on the supersaturation level, which was influenced by alkali concentration. It was concluded that the higher NaOH concentration led to a more rapid nucleation and more random cation distribution.. The magnetic properties of the nanoparticles examined by permeameter and faraday-balance equipment were consistent with the structural and morphological properties of the particles.

Université DjillaliLiabes Sidi bel abbès, Algeria


Abstract: In order to control and modify the drug release, several types of devices were used to obtain a controlled release of the organic drug. A drug delivery system can be a matrix of polymer incorporating the active agent. In the current study aimed to investigate microencapsulation technique, water in oil in water (w/o/w), the active agent (Antipyrine) loaded Cellulose Acétate butyrate (CAB)and copolymers synthesized: Poly (vinyl acetate-co-methyl methacrylate) and Poly (vinyl pyrrolidone-co-methyl methacrylate) microspheres with regard to loading efficiency, release and degradation kinetics. In our first part, the methylmethacrylate was copoly¬merized with vinyl acetate on the one hand (Cp1(VAc), Cp2(VAc)) ,secondly by a radical copolymer¬ization, under nitrogen atmosphere, in anhydrous tetrahydrofuran (THF) as sol¬vent, at 65°C, and in the presence of two percentage of initiator: 1% or 0,1% of AIBN azobisisobutyronitrile as the case during variable reactional times. The purification of our copoly¬mers has established by fractional precipitation method by addition of non-solvent [1].After several operation of “solubilizing-precipitation”, the solid copolymers (white powder) are separated by vacuum filtration. These copolymers synthesized were characterized (FTIR, 13C RMN, Tg and Mv), In the second part, microspheres were prepared by the emulsification method by solvent diffusion/evaporation technique and different polymers which were incorporated into microspheres to control the release rate of drug. Antipyrine (AP)was chosen as a model drug. The emulsion technique was investigated for to prepare active agent microparticles. CAB and copolymers synthesizedpoly (VAc-co-MMA)corresponding to the above ratios were selected as microparticles wall materials. The effects of type polymers on the physical characteristics and dissolution of the microparticles were also studied. However, the APachieved efficiency (68%) and the mean Sauter diameter (d32) of this microparticles 62 to 140 µm with the surfactant (PVA).The drug release from these formulations are performed in simulated gastric medium at pH 1,2 and at a temperature of (37 ± 0.5)°C using UV-Vis spectrophotometer to estimate its content. theTheoretical analyses of the kinetics of controlled release of AP have been established and Antipyrine dissolution rate constants were calculated from Higuchi’s [2] release model with high correlation coefficients (r2) and the values n obtained from Korsmeyer–Peppas [3] model were determinate. The suitable kinetics model for describing the release of AP from the microspheres was the Higuchi model. The coefficients of correlation r2in this model are above 0.94. From the results of Higuchi’s equation plots. From the results of the Korsmeyer–Peppas equation, the values of n are under 0,5 formicroparticles A1,A2 and A3 on the other hand. These values are in agreement with the experimental results already reported. The results of the Korsmeyer–Peppas equation, the values of n are in agreement with the experimental results already reported

Ezenwanyi Fidelia Ochuloris
University of Lagos, Nigeria
Title: Carbide precipitation in thin wall ductile iron cast in silica sand/rice husk ash mould

Biography: EzenwanyiFideliaOchuloris currently associated with the Department of Metallurgical and Materials Engineering, Faculty of Engineering. University of Lagos, Lagos, Nigeria. She holds a PhD and a Master of Science from the same department and Bachelor’s degree in Engineering from the Federal University of TechnologyOwerri (FUTO). Her interests are in solid state transformation, materials processing and development.

Abstract: Currently TWDI offer viable potential in lightweight automotive parts for energy saving requirementsHowever, as section thickness is reduced (3 mm), metallurgical quality becomes impaired as carbide precipitationand poor graphite nodule characteristics become evident in as-cast structure [1] and [2]. These features are responsible for poor functional properties of TWDI castings such as reduced ultimate tensile strength (UTS), low ductility, poor crack propagation resistance and machinability. Carbide precipitates and non-nodular graphite phases render TWDIs unsuitable for automobile applications. In this study themould sand thermal characteristics is adjusted using rice husk ash (RHA). This is employed to inhibit carbide precipitations, produce good nodule characteristicsand mechanical properties in 3 mm ductile iron castings within ASTM standard. Green sand was blended with 1-6 wt. % RHA to produce moulds for casting of 3 mm TWDIs and the samplesobtained weresubjected tomicrostructural (Optical and SEM), hardness and strength analysis. Results show that RHA significantly reduced thermal conductivity of the moulding sand from 1.631-1.141 W/m. K (a 30% reduction). The produced TWDI castings in sand mould with 4 wt. % RHA have nodule ratings > 90%, nodule count >1000 nodules/mm2 and strength of 575 MPa. Superior ductility of 5.8 occurred in sand mould containing 6 wt. % RHA. Keywords: Cooling rate, solidification, microstructure, nodularity, nodule count, strength properties.

Materials Science 2017 | by: Scientific Future Group