Program Schedule

View session wise speaker sessions below. Click on the respective day to view sessions on that particular day.

Note: The shedule of speakers and their order of talks are subject to changes.

Sessions:

Materials Science and Engineering
Mining and Metallurgy
Nano sciences and nanotechnologies
Carbon nanomaterials, devices and technologies
Process Modeling, Simulation, Optimization and Control
Shing-Hoa Wang
Shing-Hoa Wang

National Taiwan Ocean University, Keelung, Taiwan

Title of Talk: Microstructural evolution of vibration-assisted weld metal after Fatigue in stainless steel

Shing-Hoa Wang

National Taiwan Ocean University, Keelung, Taiwan

Title of Talk:
Microstructural evolution of vibration-assisted weld metal after Fatigue in stainless steel

Abstract:
The fatigue behavior and dislocation structures of SAF 2507 alloy were investigated. Specifically, as-received superduplex stainless steel SAF 2507 (AS) alloy and its weld metals from direct current welding without and with electrodynamic vibration (VIB) were studied. Fatigue experiments were conducted at total strain amplitudes of 1.2% and 2.4% (R=−1), respectively; the VIB samples exhibited higher strength but shorter fatigue lives. In the fatigued AS sample, ferrite exhibited characteristic dislocation structures, namely veins, walls, and cells, and austenite had persistent Lüders bands (PLBs) and mechanical twins. In the fatigued weld metals, the dislocation structures in austenite exhibited only PLBs; however, in ferrite, two types of walls formed due to entanglement of dislocations and rearrangement of Cr2N dislocation bundles, indicating that the fatigue strains are accommodated mostly by ferrite. The shorter fatigue lives of the VIB samples are attributed to the increased amount of intragranular austenite, and increased boundaries between intragranular austenite and δ-ferrite result in faster dislocation entanglement. Consequently, the initial response stress was the highest and work hardening rate was higher, which eventually induced cracks in δ-ferrite

Biography:
Shing-Hoa Wang received his Ph.D. degree in Metallurgy and Materials Engineering from Colorado School of Mines (CSM), Golden Colorado, USA, in 1992. After working as a Postdoctoral Fellow at the Center of Welding and joining Research in CSM, he joined National Taiwan Ocean University (NTOU), Keelung, Taiwan as an Professor and Associate Professor in the Department of Mechanical and Mechatronic Engineering in 2018 and 1993 respectively. He currently is a Distinguished Professor at NTOU. His research work was in the area of mechanical property of materials, welding process and metallurgy, metal forming, and photocatalysis of titanium oxide.

Youngsuk Jung
Youngsuk Jung

Samsung Advanced Institute of Technology,Korea.

Title of Talk: Poly(vinyl alcohol) Protecting Layer in Lithium Based Batteries

Youngsuk Jung

Samsung Advanced Institute of Technology,Korea.

Title of Talk:
Poly(vinyl alcohol) Protecting Layer in Lithium Based Batteries

Abstract:
The next-generation energy sources have been widely studied to replace the pollutant fossil fuel-based power sources.Recently, rechargeable lithium (Li) metal batteries enable prominent enhancement in duration time and portability of electronic devices and electric vehicles, because superb energy density and capacity could be obtained using Li electrodes. The theoretical capacity of the Li/Li+ coupleis known as 3860 mA h/g. Considering a standard reduction potential of 3 – 4 V, the value is comparable to the energy density of gasoline. In order to achieve a feasible application of the Li-metal battery, however, safety issues such as high reactivity of Li metal toward flammable liquid electrolytes and formation of Li dendrite on the surface of Li anode should be resolved. Herein, we report Li salt dispersed poly(vinyl alcohol) (PVA) as a protective layer for Li electrodes in Li metal batteries. PVA, the ion-exchange resin, is known to improve performance in capacitive deionization when it is applied onto the electrode as a binder. The salt containing polymer layer was coated on the surface of the Li anode. An optimum content of Li salt was evaluated by using a novel measurement method to characterize shear strength and strain of the thin protecting layer. Here we introduce the new method that can be conventionally used in characterizing the mechanical properties of thin films. Figure 1 illustrates the principles that use expansion force of the films. The revised Li metal batteries with Li saltin the protective film of 50% comparing to hydroxide groups shows increased ion conductivityup to 5  10-1 S/m. Also, retention of charge and discharge cycle life of the battery was improved prominently even at current density of 0.4 mA/cm2. The results provide useful information for designing device architecture in the fabrication of future mobile batteries.

Biography:
Youngsuk Jung received Ph. D. in Polymer science at Department of Chemistry from Seoul National University. After graduation, he spent 4 years at Polymers Division, National Institute of Standards and Technology in US. Currently he is working at Samsung Advanced Institute of Technology in Korea. His research involves characterization of polymeric-electronic materials and next generation power sources of EV and mobile batteries.

Zari tehrani
Zari tehrani

Swansea University,UK

Title of Talk: Integrated Point-of-Care Graphene Biosensors for Rapid Biomarker Detection for Brain Dieses

Zari tehrani

Swansea University,UK

Title of Talk:
Integrated Point-of-Care Graphene Biosensors for Rapid Biomarker Detection for Brain Dieses

Abstract:
With graphene technology, graphene-based biosensor, it is possible to diagnose diseases like cancer [1, 2] and dementia during very early stages compared to the conventional techniques and current biosensors. High performance of graphene biosensor is due to its large surface-to-volume ratio, remarkable optical, electrical, thermal and mechanical properties which provide high detection sensitivity, room temperature operation and open new generation of electrochemical biosensors, based on direct electron transfer between the enzyme and the electrode surface. Graphene biosensors are the new generation of sensing devices proved to be a promising and excellent nanomaterial for broad range of applications from optoelectronic to biomedical applications including sensing, drug delivery, imaging and photo-thermal therapy. In this study, two different methods of passivation were studied. First method initially the effect of utilising bi-layer photoresist in comparison to mono-layer photoresist in device fabrication of graphene biosensors was investigated. It is followed by passivation layer characterisation of low/high temperature deposition of silicon nitride (Si3N4), high temperature deposition of silicon dioxide (SiO2) and aluminium oxide (Al2O3) in graphene based biosensor. In this work, comparison between low temperature nitride and aluminium oxide deposition with high temperature Si3N4, silicon dioxide (SiO2) and Al2O3 deposition as passivation methods were explored, as the low temperature one is resistant to the widest variety of chemical etchants. Regarding Si3N4 passivation layer, effect of deposition temperature (room temperature to 300 ᴼC), silane (SiH4) gas flow (36-48 sccm) and low frequency power (30-60 W) on layer thickness and roughness were fully characterised by using ellipsometer and scanning electron microscope (SEM). In addition to Si3N4 and SiO2 passivation layers, Al2O3 passivation layer deposited by ALD and sputtering were also investigated. In the second method, the screen print passivation layer was studied. Finally, after fully characterisation of the results, final optimised chip which passed all our electrochemistry tests required for dementia was fabricated. This technique is scalable, reliable, and capable of providing a rapid, quantitative, label-free assessment of biomarkers at µg/mL concentrations in analyte solutions. This system has been specifically developed for Point-of-Care (POC) use.rs.

Biography:
Zari works at Swansea University; a unique facility applying device fabrication & cleanroom semiconductor processing to healthcare problems in collaboration with industry. The group has 14 years’ experience in clean room device fabrication. Zari has developed graphene technology through EPSRC and Innovate UK and Marie Curie sensor projects. The group developed the world’s first graphene biosensor and is now adapting the platform technology for applications in diagnostics related to dementia, cardiac disease and hepatitis. The group has grant income of more than £4 million. The group has published more than 70 papers and holds 2 granted patents (WO2011004136 and P100072GB).

Byungil Hwang
Byungil Hwang

Chung-Ang University, Korea

Title of Talk: Fatigue Resistant Cu/Gr Nanolayered Composites for Highly Reliable Flexible Interconnect

Byungil Hwang

Chung-Ang University, Korea

Title of Talk:
Fatigue Resistant Cu/Gr Nanolayered Composites for Highly Reliable Flexible Interconnect

Abstract:
With the technological developments in flexible/stretchable electronics, there are increasing demands for the robust metal thin film interconnects that can tolerate the fatigue under cyclic deformation. Even with a small strain below the yield point of the metal interconnects, dislocation can accumulate on the film/substrate interfaces that cause void and extrusion formation. During the repeated deformation, applied stress can be concentrated on the extrusion; thus, fatigue cracks can be initiated at the regions and propagated quickly through the metal films, which results in the degradation of the conductivity of the interconnects. Therefore, suppressing the crack initiation and propagation is critical for the development of a reliable metal interconnect for the flexible electronics applications. In this study, metal/grapheme nanolayered composite that can suppress the crack propagation was explored for the reliable interconnect with enhanced fatigue resistance. Cu/Gr composite with repeat layer spacing of 100 nm was fabricated by the well-kwon wet transfer method, and tested for bending fatigue at 1.6% and 3.1% strain up to 1,000,000 cycles that showed a 5-6 times enhanced fatigue resistance than the Cu only thin film. Cross-sectional SEM and TEM images revealed that the fatigue cracks generated within the Cu layer were stopped by the graphene interface. The high in-plane strength of graphene due to the strong sp2 bonding can simultaneously serve as an effective interface for suppressing the fatigue crack propagation. Molecular dynamics simulations showed the density of dislocation pile-up at the film/substrate interfaces was reduced in the Cu/Gr system, which support the enhanced fatigue resistance in this materials system by suppressing the fatigue crack formation mechanism observed in the conventional Cu film/substrate interfaces.

Biography:
will update soon..

Yongfu Lian
Yongfu Lian

Heilongjiang University, China.

Title of Talk:

Yongfu Lian

Heilongjiang University, China.

Title of Talk:

Abstract:
Because of their insoluble and bundling nature of single-walled carbon nanotubes (SWNTs) in liquid medium,, it is still a challenge to obtain individual SWNTs and then to sort them in line with their conductivity. With the development of SWNTs-based nanodevices,[1] the demand for highly pure semiconducting as well as metallic SWNTs has increased considerably. Recently, dispersing agents such as surfactants, biomacromolecules, ionic liquids and polymers[2] were reported to be able to disperse SWNTs selectively. In this study, amino acids were functionalized by the Shotton-Bowmann condensation reaction and then applied to the selective dispersion and enrichment of SWNTs. Aimed to the solvent effect, SWNTs were dispersed ultrasonically by sodium (2S)-1-dodecanoylpyrrolidine-2-carboxylate in deionized water, ethanol and other polar solvents, respectively. The obtained SWNTs dispersions were subjected to ultracentrifugation, and the individual SWNTs were achieved in liquid medium. UV-vis-NIR and Raman scattering spectra confirmed that metallic SWNTs were selectively dispersed in the solution of sodium (2S)-1-dodecanoylpyrrolidine-2-carboxylate.

Biography:
will update soon..

Alexander Herega
Alexander Herega

Odessa National Academy of Food Technologies, Ukraine

Title of Talk: On the effect on mesoscopic structure in problems of self-organized clusters percolation: Computer simulation

Alexander Herega

Odessa National Academy of Food Technologies, Ukraine

Title of Talk:
On the effect on mesoscopic structure in problems of self-organized clusters percolation: Computer simulation

Abstract:
The computer model of percolation clusters, which are self-organizing in the process of genesis, is proposed. Two-dimensional cluster systems whose properties depend on the local organization of the cluster structure and history of its creation are studied. The construction of the cluster system in the model is carried out by the Monte Carlo method using an iterative algorithm for realizing the interaction of its elements and two variants of the law of attraction. The model contains the possibility of changing the type and parameters of the laws of particle-particle and particles with small clusters interactions. The analytical dependences of the parameters of clusters (radius of gyration, degree of anisotropy, correlation length, the fractal and correlation dimensions, lacunarity, and others) on the degree of self-organization, on the characteristic values of the correlation length, and on the generation rate of the system are calculated in the research. For that in the model studied their dependence, respectively, on the number of acts of particle interaction, on the maximum distance at which elements of the system can be combined into a cluster, as well as on the number of particles generated at the percolation field at each step of creating an infinite cluster. 1. P. Bak, C. Tang, K. Wiesenfeld, Phys. Rev. A 38, 364 (1988). 2. L. Zelenyi, A. Milovanov, Phys. Usp. 47, 749 (2004). 3. A. Herega, Nanomechanics Science and Technology 4 (2), 119 (2013). 4. А. Herega, Yu. Кryvchenко, Proc. of Conf. “Chemistry, Physics and Technology of Surface”, Kyiv, Ukraine (2018).

Biography:
Alexander Herega PhD, DSc, Prof. currently works at the Department of Applied Mathematics at Odessa National Academy of Food Technologies, Ukraine. He teaches General Physics, Computer Science, Information Technologies and System Science. His areas of research are Materials Science, Percolation Theory, Fractal Clusters, Dynamical Systems, Deterministic Chaos, Computer Simulation, and Modeling of Physical Phenomenon. Prof. Alexander Herega is a member of the American Physical Society (APS), American Chemical Society (ACS), and Ukrainian Physical Society. He has more 100 publications, monograph "The Selected Models of the Mesostructure of Composites: Percolation, Clusters, Force Fields", and three text-books "Simulation and statistical modeling", "Constructive fractals in set theory", and "Course of physics". He belongs to the editorial board of the International Journal of Composite Materials.

Baofeng Lin
Baofeng Lin

Guangxi University, China

Title of Talk: Preparation and application of novel materials based on cross-linking modification of natural polysaccharide

Baofeng Lin

Guangxi University, China

Title of Talk:
Preparation and application of novel materials based on cross-linking modification of natural polysaccharide

Abstract:
Being a natural renewable resource, natural polymer due to their inexpensive, non-toxicity and good biocompatibility, have considered increasing interests in bio-adsorbent, drug delivery carriers and biomedical materials, etc. To gain the porous 3D network structure and stability, the introduction of essential reversible covalent bonds into the polysaccharides hydrogel network is necessary. Our research focuses on the preparation and application of novel materials, which bases on the crosslink reaction between a large number of active groups (hydroxyl groups, amino groups, etc.) on the molecular chain of natural polysaccharides (chitin, cellulose, sodium alginate, etc.) and glutaraldehyde or vanillin to prepare novel adsorbents and self-healing materials. Then, the structural characterizations of these crosslinked materials were investigated by FT-IR, TGA, SEM, BET, AFM and so on. Meanwhile, the adsorption properties and self-healing properties, the influencing factors, and the intrinsic mechanism were explored. The results showed that a series of bio-adsorbents and self-healing materials were successfully prepared through glutaraldehyde and vanillin cross-linking reaction. The bio-adsorbents had good performance for water remediation, which can be attributed to the presence of large amounts of amino and carboxylic groups on the surface of adsorbent and the porous structures. We found that the selfhealing effect of the chitosan/vanillin hydrogel mainly originated from the reconstruction of the Schiffbase bond, while the hydrogen bonds were relatively stable at room temperature. It is necessary to control the amount of cross-linker vanillin to obtain hydrogels with self-healing properties. Based on the results obtained, we can conclude that the novel materials based on cross-linking modification of natural polysaccharide are expected to have potential applications in water treatment, tissue engineering, wound-repairing, biosensors and other fields.

Biography:
Baofeng Lin received a Ph.D. in Environmental Science from Wuhan University, China, in 2010. She was a visiting scholar in the United States Department of Agriculture and University of Maryland United States in 2013. Her research interests include three major directions: 1) Development of functional polymer material for food preservation, harmful adsorption and drug carrier, especially novel composites of MOFs-natural polymer for controlled drug release carrier technology; 2) Modifying and value-added renewable resource to produce various chemicals, antimicrobial, rubberreinforced material and biomaterials; 3) The technology & application of biodegradable and bio-based plastics.

R  B  Pujar
R B Pujar

P C Jabin Science College, India

Title of Talk: Studies on some physical properties of cadmium doped nickel ferrites

R B Pujar

P C Jabin Science College, India

Title of Talk:
Studies on some physical properties of cadmium doped nickel ferrites

Abstract:
Nickel ferrite is found to be a versatile magnetic material on account of its inverse spinel structure. Its electric and magnetic properties can be altered by suitable dopants. Here we report on Cd doped Ni ferrites with a general chemical formula Ni1-x Cdx Fe2 O4 where X= 0.1 to 0.4, by double sintering ceramic method using AR grade oxides in molar proportions. X-ray diffractograms confirm the formation of a single phase fcc spinel structure without any impurity phases. The increase in lattice parameter with Cd content is attributed to Vegard’s law. The porosity varies from 28% to35% depending on the purity of starting materials and sintering temperature. The decrease in crystallite size with an increase in Cd content indicates smaller solubility of the content in the system. The dislocations make the boundary between the slipped and un slipped regions that modify the dielectric behavor of the material. In I R spectra, principal absorption bands appear around 600cm-1 and 400cm-1 which are assigned to vibrations of tetrahedral complexes corresponding to highest restoring force and bond bending vibrations of octahedral complexes respectively. Hence γ1 band is expected to be greater than γ2 band. The splitting of principal bands is due to John –Teller effect caused by Fe+2 ions. SEM micrographs exhibit exaggerated grain growth along with a matrix of fine grains. Such a structure is due to rapid growth of grains at the cost of their neighbours. The increase in an average grain growth is attributed to ionic volume differences of respective ions in the system. Key words: Lattice parameter, porosity, crystallite size, IR spectra,Micrograms.

Biography:
will update soon..

Sun Minghan
Sun Minghan

Yanshan University,Hebei

Title of Talk: Mechanism and Simulation Experiment Research on Twin-roll Thin-strip Vibration Casting

Sun Minghan

Yanshan University,Hebei

Title of Talk:
Mechanism and Simulation Experiment Research on Twin-roll Thin-strip Vibration Casting

Abstract:
A set of φ160×150 vibration casting machine is designed and manufactured in order to carry out the research on the product quality of twin roll strip casting process.The effect of vibration on the crystal nucleation and cast microstructure was studied.The distribution and growth rule of cast microstructure in the solidification zone under the condition of vibration and non-vibration were compared and analyzed.Points out that improving the vibration frequency can effectively promote the grain refinement.At the same time, according to the requirement of industrial experiment, the three-dimensional flow fieldtemperature field coupling finite element simulation model of molten pool was established by using CFD software.The results showed that increasing the vibration frequency and amplitude can enhance the "mixing" effect of the cast rolling molten pool, which can promote the grain refinement and restrain the segregation.It is found that the solidification point position (i.e. Kiss point height) is not distributed along the width direction of the plate in the process of castrolling.As a result, the longitudinal inhomogeneous extension is the direct factor to induce the cast rolling oblique crack.And the Kiss point position will be moved up with the increase of the amplitude and the frequency. Key words:oscillation;twin-roll casting;cast microstructure;grain refinement;Kiss point

Biography:
will update soon..

Jaime R. Gomes
Jaime R. Gomes

University of Minho, Portugal

Title of Talk: Controlled release of hydrogen peroxide anchored in silica nanoparticles for application in the washing process and in antimicrobial textiles

Jaime R. Gomes

University of Minho, Portugal

Title of Talk:
Controlled release of hydrogen peroxide anchored in silica nanoparticles for application in the washing process and in antimicrobial textiles

Abstract:
Micro and nanoencapsulated products for controlled delivery are attractive since they are protected against other chemicals until they release the payload. This technology proposes the release of the active product, by entrapment or immobilization in silica nanoparticles of aqueous products, by using a modified sol-gel process, the Stober method (Stober, 1968). The nanoparticles were tested for the controlled delivery of oxidising products, for application in detergents’ bleaching action and antimicrobial activity. For application on textiles, the oxidising agents are immobilized by a polymer film applied on the fabric for durability purposes. In detergents, hydrogen peroxide is released by perborate and percarbonate, of low solubility and unstable in storage. Sodium perborate and percarbonate are used in detergents as hydrogen peroxide releasing agents. They have however problems in storage due to reaction with potential reducing agents (enzymes, etc), and poor solubility below 60ºC (sodium perborate) and non release of hydrogen peroxide below 50ºC. For low temperature bleaching peroxide activators are used, such as TAED, tetraacetylethylene diamine. However, the solubility at low temperatures of such activators is also low. The nanoparticles we prepared were porous and contained hydrogen peroxide, releasing it at temperatures as low as 15ºC. Release tests were performed. These nanoparticles can also have other aqueous oxidising payloads, such as peracids, for lower temperature bleaching performance. The hydrogen peroxide content is higher than in percarbonate. In textiles, antibacterial products are usually based on silver nanoparticles and cationic products. Silver in the form of nanoparticles are being banned worldwide and cationic products will soon be in doubt for causing resistant bacteria. Peroxides on the other hand are innocuous and do not cause bacterial resistance. For textiles when applied with as an antibacterial they will be resistant to washing when applied with polymers that form a protective film over them. Analytical testing for the presence or peroxides and antimicrobial activity was tested on cotton fabric treated with peroxide containing nanoparticles. The results showed more than 90% inhibition, before and after repeated washing.

Biography:
Jaime Rocha Gomes holds a Phd from Leeds University, UK, in Colour Chemistry and is a full Professor at University of Minho, in Textile Chemistry. Has many years of projects with the textile industry, and has started 3 spin-off companies, on the area of microcapsules and nanoparticles for textiles, Micropolis, sold in 2007, and Ecoticket and Ecofoot, founded in 2008 and 2012 respectively. At the University since 1976, he has published more than 30 papers in international peer reviewed journals, 10 international patents, and more than 100 papers in international conferences, and has won a national prize for Innovation in 2011.

Wazirzada Aslam Farooq
Wazirzada Aslam Farooq

King Saud University, Saudi Arabia

Title of Talk: Evaluation of modifications in laser irradiated Nickle doped Cadmium Oxide nanostructured thin films synthesized by sol get method

Wazirzada Aslam Farooq

King Saud University, Saudi Arabia

Title of Talk:
Evaluation of modifications in laser irradiated Nickle doped Cadmium Oxide nanostructured thin films synthesized by sol get method

Abstract:
Structural modification and changes in optical properties of irradiated nano structured Nickle doped Cadmium oxide thin film synthesized using sol-gel technique are presented. Q-switched Nd-YAG pulsed laser from Quantal was used to irradiate the nanostructured thin film samples. Pulse width of the laser is 8ns and it operates at maximum 10 Hz. The fundamental wavelength of the laser at 1064 nm and second harmonic 532 nm wavelengths were used to irradiate the samples. Structural modifications are investigated with images of scanning electron microscope and XRD patterns. Crystal sizes are calculated from FWHM of XRD peaks using scherrer formula. Optical properties are studied via absorption and photoluminescence spectra. Optical band gaps are estimated from Tauc plot. The study reveals that optical band gaps of nanostructured thin films are controlled with laser irradiation. The results are important for application of semiconductors in optoelectronic devices and micromachining with lasers.

Biography:
Dr Wazirzada Aslam Farooq did his Ph.D in laser spectroscopy from Imperial College London in 1992. He is co-founder of Pakistan Institute of Laser and Optics (PILO) Islamabad. He served there as head of institute till 2009 then joined King Saud University Riyadh Saudi Arabia as professor of Physics. He has published more than 140 papers in ISI journals in various disciplines of science and engineering including, laser material interaction, Laser Induced Breakdown Spectroscopy (LIBS), nanotechnology, Dye synthesis and quantum dots solar cells. Dr Farooq has supervised many post graduate students in the above mentioned fields. He is collaborating with many internationally reputed institutes.

Ahmad Faraz
Ahmad Faraz

University College Cork, Ireland

Title of Talk: Magnetic-field-induced ferroelectric domain dynamics and in-plane polarization in odd and mixed layered Aurivillius structures

Ahmad Faraz

University College Cork, Ireland

Title of Talk:
Magnetic-field-induced ferroelectric domain dynamics and in-plane polarization in odd and mixed layered Aurivillius structures

Abstract:
Herein, we conclusively discovered the role 2D odd/mixed layered Aurivillius structures in generating coupled order parameters by directly visualizing magnetic-field-induced ferroelectric switching. We developed novel SLI-CVD process to fabricate atomistically controlled layer-by-layer genuine multiferroic Bi6Ti2.9Fe1.5Mn0.6O18 and Bi6Ti2.7Fe1.5Mn0.8O18thin films. Ferromagnetic signature (MS = 13.79emu/cc, HC = 9mT at 300K and MR = 8emu/cc) generated for Bi6Ti2.9Fe1.5Mn0.6O18 thin films, however, no response observed for mixed m=5/6 intergrowths in Bi6Ti2.7Fe1.5Mn0.8O18film. In-plane PR with magnetic (Fe/Ti)/conducting (Au/Ti) for Bi6Ti2.9Fe1.5Mn0.6O18 thin films is less (±23.66-24.69µC/cm2) than mixed m=5/6 Bi6Ti2.7Fe1.5Mn0.8O18layer structure (±57.42-67.94 µC/cm2). High leakage-current for Fe/Ti IDCs compared to Au/Ti IDCs samples confirm Au/Ti IDCs suitability for ferroelectric industry. High ferro-paraelectric transition (Tc= 850K), excellent in-plane polarization with negligible fatigue (9% after 1010 switching cycles) and coupled ME (10% in-plane and 13% out-of-plane) orders provides important contribution in high-temperature fatigue free non-volatile in-plane FeRAM, 4-state logics and ME sensors.

Biography:
will update soon..

Songmin Shang
Songmin Shang

The Hong Kong Polytechnic University, Hong Kong

Title of Talk: (2-hydroxypropyl)-B-cyclodextrin/PVA eco-adsorbent for the removal of ibuprofen from pharmaceutical sewage

Songmin Shang

The Hong Kong Polytechnic University, Hong Kong

Title of Talk:
(2-hydroxypropyl)-B-cyclodextrin/PVA eco-adsorbent for the removal of ibuprofen from pharmaceutical sewage

Abstract:
Low-cost polymeric eco-adsorbent has been prepared via solution blending of (2-hydroxypropyl)-B-cyclodextrin and polyvinyl alcohol, followed by chemical crosslinking with glutaraldehyde solution. Its structure has been investigated by means of Fourier transform infrared spectroscopy and thermogravimetric analysis. Its potential in the removal of ibuprofen from sewage has been studied via ibuprofen adsorption tests at different pH values, drug concentrations and adsorbent compositions. The adsorption kinetics of the obtained adsorbent has also been investigated. The obtained adsorbent is well-crosslinked and does not redissolve in aqueous solution. It can be handled conveniently without breaking. The adsorption results show that its ibuprofen adsorption kinetics well obeys the pseudo second order kinetic model. The obtained adsorbent can adsorb up to 75% of ibuprofen at the initial ibuprofen concentration of 50 mg/L. Its ibuprofen adsorption capacity decreases with pH value, and increases with ibuprofen concentration and (2-hydroxypropyl)-B-cyclodextrin content. It has better ibuprofen adsorption performance than mesoporous silica, volcanic soil and zeolite. As a result, it is a promising eco-adsorbent for the treatment of pharmaceutical sewage and would be an eco-friendly replacement of activated carbon.

Biography:
Dr SHANG graduated from The Hong Kong Polytechnic University (PolyU) in 1997 with a PhD. His main research fields are the science and engineering of nanotechnology and new materials, novel textiles technology, eco-friendly and low-carbon-emission coloration technology, and sustainable dyeing-finishing technology. He published more than 180 papers, of which more than 80 are SCI journal articles and more than 40 have impact factors above 3. The total citation of his publications is over 1,800 and one paper with more than 300 citations is listed among the HIGHLY CITED PAPERS IN MATERIALS SCIENCE by Web of ScienceSM.

Brahim Belkessa
Brahim Belkessa

Research Center in Industrial Technologies, Algeria

Title of Talk: Microstructure, mechanical and corrosion behavior of dissimilar metals welded joints

Brahim Belkessa

Research Center in Industrial Technologies, Algeria

Title of Talk:
Microstructure, mechanical and corrosion behavior of dissimilar metals welded joints

Abstract:
In this work, microstructure, mechanical behavior and the corrosion resistance of dissimilar metals welded between 2205duplex stainless steel and high strength low alloy steel API X52 were studied. The welding by using a shielded metal arc welding process (GTAW) was conducted using two different filler metals, the duplex E2209 and austenitic E309 grade. The microstructures of the dissimilar metal joints have been investigated by optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy (EDS). Metallographic exam reveals the presence of a narrow zone of about 50 µm between the fusion boundary and the type II boundary. EDS analysis at the interface X52 weld metal showed an evident gradient variation of Cr and Ni between boundaries of fusion and type II, due to the migration of carbon from HSLA steel to weld metal. The modes of the fracture surface for all specimens are ductile except for the X52 steel heat affected zone, which is quasi cleavage because the narrow hard and brittle band present in this zone. In order to evaluate the influence of the filler on the corrosion resistance of the dissimilar weldments, potentiodynamic polarization tests of different regions of the welded joints were evaluated in 3.5% NaCl and 3.5% H2SO4solutions. The weld metal produced by E309 electrode exhibits a higher corrosion resistance in both solutions. Keywords: Dissimilar welding, Duplex stainless steel, heat-affected zone, filler metals, corrosion resistance

Biography:
will update soon..

Nandkishor Shirsath
Nandkishor Shirsath

North Maharashtra University, India

Title of Talk: TiO2 Nanocomposite in Starch-Poly (Acrylamide) Copolymer and Its Application as a Plant Growth Regulator

Nandkishor Shirsath

North Maharashtra University, India

Title of Talk:
TiO2 Nanocomposite in Starch-Poly (Acrylamide) Copolymer and Its Application as a Plant Growth Regulator

Abstract:
The present study describes the development of nano-TiO2 based composite of starch-co-poly(acrylamide) copolymer. The graft copolymer was characterized by Fourier transform infrared (FT-IR), thermal gravimetric analysis (TGA), scanning electron microscopy (FE-SEM), and X-Ray Diffraction (XRD) confirmed that acrylamide (AM) was grafted onto starch successfully. The effects of pH, initiator dosage, temperature, and time on grafting percentage (GP) and grafting efficiency (GE) were also investigated. The synthesized TiO2 nanoparticles were successful to enhance the thermal and biological properties of a native copolymer which was confirmed by TGA and biological assay. This synthesized nanocomposite starch-co-poly(acrylamide) was used as a superabsorbent polymer (SAP) with great thermal property and antibacterial activity which regulates the growth of the mung bean plant. Keywords: Starch-co-poly(acrylamide) copolymer; TiO2 nanoparticles; Antibacterial activity; Superabsorbent polymer; Plant growth regulator.

Biography:
will update soon..

Z. Tehrani
Z. Tehrani

Swansea University, UK.

Title of Talk: Integrated Point-of-Care Graphene Biosensors for Rapid Biomarker Detection for Brain Dieses

Z. Tehrani

Swansea University, UK.

Title of Talk:
Integrated Point-of-Care Graphene Biosensors for Rapid Biomarker Detection for Brain Dieses

Abstract:
With graphene technology, graphene-based biosensor, it is possible to diagnose diseases like cancer [1, 2] and dementia during very early stages compared to the conventional techniques and current biosensors. High performance of graphene biosensor is due to its large surface-to-volume ratio, remarkable optical, electrical, thermal and mechanical properties which provide high detection sensitivity, room temperature operation and open new generation of electrochemical biosensors, based on direct electron transfer between the enzyme and the electrode surface. Graphene biosensors are the new generation of sensing devices proved to be a promising and excellent nanomaterial for broad range of applications from optoelectronic to biomedical applications including sensing, drug delivery, imaging and photo-thermal therapy. In this study, two different methods of passivation were studied. First method initially the effect of utilising bi-layer photoresist in comparison to mono-layer photoresist in device fabrication of graphene biosensors was investigated. It is followed by passivation layer characterisation of low/high temperature deposition of silicon nitride (Si3N4), high temperature deposition of silicon dioxide (SiO2) and aluminium oxide (Al2O3) in graphene based biosensor. In this work, comparison between low temperature nitride and aluminium oxide deposition with high temperature Si3N4, silicon dioxide (SiO2) and Al2O3 deposition as passivation methods were explored, as the low temperature one is resistant to the widest variety of chemical etchants. Regarding Si3N4 passivation layer, effect of deposition temperature (room temperature to 300 ᴼC), silane (SiH4) gas flow (36-48 sccm) and low frequency power (30-60 W) on layer thickness and roughness were fully characterised by using ellipsometer and scanning electron microscope (SEM). In addition to Si3N4 and SiO2 passivation layers, Al2O3 passivation layer deposited by ALD and sputtering were also investigated. In the second method, the screen print passivation layer was studied. Finally, after fully characterisation of the results, final optimised chip which passed all our electrochemistry tests required for dementia was fabricated. This technique is scalable, reliable, and capable of providing a rapid, quantitative, label-free assessment of biomarkers at µg/mL concentrations in analyte solutions. This system has been specifically developed for Point-of-Care (POC) use.rs.

Biography:
Zari works at Swansea University; a unique facility applying device fabrication & cleanroom semiconductor processing to healthcare problems in collaboration with industry. The group has 14 years’ experience in clean room device fabrication. Zari has developed graphene technology through EPSRC and Innovate UK and Marie Curie sensor projects. The group developed the world’s first graphene biosensor and is now adapting the platform technology for applications in diagnostics related to dementia, cardiac disease and hepatitis. The group has grant income of more than £4 million. The group has published more than 70 papers and holds 2 granted patents (WO2011004136 and P100072GB).

Ming Qian
Ming Qian

Jilin University, China

Title of Talk: Nonmonotonic evolution of grain boundary characterization distribution of the wrought Ni3Al-based alloy under grain boundary engineering.

Ming Qian

Jilin University, China

Title of Talk:
Nonmonotonic evolution of grain boundary characterization distribution of the wrought Ni3Al-based alloy under grain boundary engineering.

Abstract:
A one-step grain boundary engineering (GBE) was performed on a wrought Ni3Al-based alloy. The effect of coupled annealing at 1180C from 1 to 40 hwas investigatedon the grain boundary character distribution(GBCD) using EBSD, SEM and TEM. 3 twin boundary constituted the major portion of the special grain boundaries(GBs), whose frequency evolved in a concave upward feature with the annealing time. Similar trend applies to high order twin boundaries. Conversely, subgrainboundary(SGB) evolved in a concave downward manner, corresponding to that of substructured grain component. The hardness of the alloy evolved in a gradual rise, fall and rise manner. Such hardening of the alloy was attributed to the comprehensive effect from the special GBs, subgrain boundary and grain size that evolved differently with annealing time.

Biography:
will update soon..

Guangjun Gao
Guangjun Gao

Central South University, China.

Title of Talk: Influence of stress waves on initial impact force of flexible composite structure

Guangjun Gao

Central South University, China.

Title of Talk:
Influence of stress waves on initial impact force of flexible composite structure

Abstract:
The initial impact force of the thin-walled structures is obviously higher than the mean force in a collision, which leads to the damage of the structure and the occupant [1]. Effective reduction of initial impact force is the key to the design of energy absorption structures. When the initial peak force is generated at the early stage of collision, the plastic deformation of the structure is not obvious, and it is still affected by the stress waves [2,3].The propagation of stress waves is affected by the properties of structural medium. When the stress waves propagate into a new medium, new reflection and transmission waves will be produced within the structure based on the impedance of two kinds of media. At the same time, The stress concentration occurs when stress waves are encountered holes or other structural geometric imperfections [4,5]. Therefore, to achieve the purpose of reducing the initial peak force, a flexible composite structure can be used to control the propagation process of stress waves in the structure. Flexible composite structures are usually composed of several flexible materials. For layered composite structures composed of different materials, the shape and amplitude of the transmitted waves and reflected waves depend on the impedance in the propagation process of stress waves. Because the size of the wave impedance depends on the density of the material, the optimization of the density of the material for a layered structure can make the stress waves dissipate rapidly between different materials. In this work, the influence of material distribution on initial load of flexible composite structure is studied. The influence of material impedance, material thickness and wavelength of stress waves on stress wave attenuation is analyzed. In order to minimize the stress at the fixed end of the structure, the finite element method combined with genetic algorithm is used to optimize attenuation of stress wave in the flexible composite structure. The effect of thickness change of two kinds of materials on stress wave attenuation is analyzed by selecting low carbon steel and foam aluminum layered composite structure. It is found that the stress amplitude at the fixed ends of two composite structures with the same material but different thickness is not the same. When changing the thickness of the material in the composite structure, the period of the fluctuation of the stress waves in the structure is also different, resulting in different attenuation effects of stress waves in the structure. Meanwhile, The propagation characteristics of stress waves at different wavelengths in composite structures are analyzed. It is found that the attenuation of amplitude increases with the decrease of the wavelength ratio of stress waves, which means that the effect of layered structure on the attenuation of force amplitude is more obvious. Finally, The layered stress attenuation structure is optimized by combining finite element method with genetic algorithm. It can be seen from the results that the layered structure is composed of the largest impedance and the smallest material under the influence of different input stress wavelengths and the change of stress wave amplitude mainly depends on the impedance ratio between the two interfaces.

Biography:
Guangjun Gao, a professor at Central South University, Dean of the School of Transportation Engineering, visiting scholar at the University of Birmingham, selected as Outstanding Youth Project Fund of Hunan Province and New Century Talents Support Program of the Ministry of Education. Gao presided over major projects of the National Natural Science Foundation, Ministry of Science and Technology and Hunan Outstanding Youth Fund, etc. In the field of train collision protection, Gao proposed the leapfrog absorbing impact force-displacement curve and the design method of the energy-absorbing structure with low strain rate effect, invented the crashworthiness car-body, the active-passive cutting energy absorber and anti-derailment/overturning device. Gao won the "Mao Yisheng Railway Education Research Award" and "Mao Yisheng Railway Science and Technology Award". Gao has published over seventy journal papers.

Hassan Ez-Zaki
Hassan Ez-Zaki

Mohammed V University, Morocco

Title of Talk: β-Dicalcium Silicate Cement Modified with β-Tricalcium Phosphate: In Vitro Bioactivity and Mechanical Strength

Hassan Ez-Zaki

Mohammed V University, Morocco

Title of Talk:
β-Dicalcium Silicate Cement Modified with β-Tricalcium Phosphate: In Vitro Bioactivity and Mechanical Strength

Abstract:
Calcium-silicate cement mainly based on dicalcium-silicate (C2S) was synthesized by the solid state reaction route. Beta-C3P was added to C2S to obtain C2S-C3P. Zinc oxide and bismuth oxide were incorporated to prepare radiopaque cement. Within this work, the bioactivity and the mechanical strength of the synthesized cement have been investigated. The in vitro test was carried out by immersion of cement pastilles in the artificial saliva in different periods of time ranging from 4 hours to 30 days. Whereas, the mechanical strength of some samples was operated at 28 and 72 days. The specimens are characterized by X-ray diffraction, Infrared spectroscopy and scanning electron microscopy. The finding results indicated that hydroxyapatite may appear after 24 hours of soaking; it was also shown that the presence of C3P with a small amount of the cement can enhance the bioactivity of calcium silicate cement. Furthermore, the addition of zinc oxide and bismuth oxide increase the radiopacity of the cement. However, the mechanical strength was enhanced with the incorporation of the zinc oxide but decreases with bismuth oxide. It was concluded then, that there is possibility of combining addition of C3P (10%) and radiopacifiers agent ZnO/Bi2O3 (15%) with small amounts on C2S to obtain cement with excellent bioactivity, good mechanical strength and significante radiopacity that makes this material a great candidate for biomedical use.

Biography:
Hassan Ez-zaki, PhD in Solid Chemistry at Laboratory of Applied Solid State Chemistry, Department of chemistry, Mohammed 5th University of Rabat, Morocco. My PhD research studied the beneficial use of marine waste for the design of composite cement in which both strength and durability requirements are explicitly satisfied. Currently, my mates and I continue to develop different research projects at the Laboratory of applied solid state chemistry, Mohammed V University of Rabat. The main aim is to synthesis a Belitic clinker from mineral by-products and tries to find alternatives is terms of durability, environmental impact and financial saving. I have been fortunate enough to also serve as a teaching assistant for practical component in fundamentals of inorganic chemistry. This position has allowed me to gain valuable experience working in an academic environment by assisting undergraduate students. My professional experience has provided me with a board view that is useful in assisting master students with projects.

Youngsuk Jung
Youngsuk Jung

Samsung Advanced Institute of Technology, Korea.

Title of Talk: Poly(vinyl alcohol) Protecting Layer in Lithium Based Batteries

Youngsuk Jung

Samsung Advanced Institute of Technology, Korea.

Title of Talk:
Poly(vinyl alcohol) Protecting Layer in Lithium Based Batteries

Abstract:
The next-generation energy sources have been widely studied to replace the pollutant fossil fuel-based power sources.Recently, rechargeable lithium (Li) metal batteries enable prominent enhancement in duration time and portability of electronic devices and electric vehicles, because superb energy density and capacity could be obtained using Li electrodes. The theoretical capacity of the Li/Li+ coupleis known as 3860 mA h/g. Considering a standard reduction potential of 3 – 4 V, the value is comparable to the energy density of gasoline. In order to achieve a feasible application of the Li-metal battery, however, safety issues such as high reactivity of Li metal toward flammable liquid electrolytes and formation of Li dendrite on the surface of Li anode should be resolved. Herein, we report Li salt dispersed poly(vinyl alcohol) (PVA) as a protective layer for Li electrodes in Li metal batteries. PVA, the ion-exchange resin, is known to improve performance in capacitive deionization when it is applied onto the electrode as a binder. The salt containing polymer layer was coated on the surface of the Li anode. An optimum content of Li salt was evaluated by using a novel measurement method to characterize shear strength and strain of the thin protecting layer. Here we introduce the new method that can be conventionally used in characterizing the mechanical properties of thin films. Figure 1 illustrates the principles that use expansion force of the films. The revised Li metal batteries with Li saltin the protective film of 50% comparing to hydroxide groups shows increased ion conductivityup to 5  10-1 S/m. Also, retention of charge and discharge cycle life of the battery was improved prominently even at current density of 0.4 mA/cm2. The results provide useful information for designing device architecture in the fabrication of future mobile batteries.

Biography:
Youngsuk Jung I received Ph. D. in Polymer science at Department of Chemistry, Seoul National University in Korea. After graduation, I spent 4 years at Polymers division, National Institute of Standards and Technology in US. Currently I am working at Samsung Advanced Institute of Technology in Korea for 10 years. My research involves characterization of polymeric materials used in flexible displays and next generation power sources of EV and mobile batteries; those include highly transparent organic-inorganic hybrid films, polymer light emitting materials, and battery membranes. I also work on the characterization of molecular structure and thermo-mechanical properties for flexible display components.

Qiancheng Zhang
Qiancheng Zhang

Xi’an Jiaotong University, China

Title of Talk: Compressive properties of Ni-based alloy pyramidal lattice core sandwich structure with cross-stiffened hollow trusses fabricated by selective laser melting

Qiancheng Zhang

Xi’an Jiaotong University, China

Title of Talk:
Compressive properties of Ni-based alloy pyramidal lattice core sandwich structure with cross-stiffened hollow trusses fabricated by selective laser melting

Abstract:
A novel lightweight Ni-based alloy pyramidal lattice core sandwich structure with cross-stiffened hollow trusses is fabricated by selective laser melting (SLM). The performance of the sandwich structure under quasi-static out-of-plane compression is investigated by experiment test, numerical simulation and theoretical analysis. Experiment results agree well with numerical simulation and theoretical analysis. It is found that the proposed structure has greater strength and energy absorption capacity than those of hollow lattice cored sandwich. In addition, it is demonstrated by numerical simulation that cross-stiffened plates stabilize buckling of hollow lattice truss and change their crushing deformation, leading to enhanced strength and energy absorption specially in the low-density region. These findings offer new insights into the study of mechanical response of sandwich structures, which can benefit a particular engineering. Keywords: Sandwich structure; Pyramidal lattice core; Out-of-plane compression; Selective laser melting.

Biography:

KOHKI MUKAI
KOHKI MUKAI

Yokohama National University, Japan

Title of Talk: Template method used for position control of individual silica-coated quantum dot and formation of quantum-dot perfect superlattice

KOHKI MUKAI

Yokohama National University, Japan

Title of Talk:
Template method used for position control of individual silica-coated quantum dot and formation of quantum-dot perfect superlattice

Abstract:
Semiconductor quantum dot (QD) is promising for various kinds of future optoelectronics devices [1]. In this paper, we review our template methods for individual positioning and dense packing of colloidal QD. The former is aimed at the quantum information devices using single photon [2], and the latter is at the solar cells of extremely high energy conversion efficiency [3]. We succeeded in controlling the apparent size of silica-coated PbS QD in the range of 20 to 140 nm and trapping the QD in a nanohole prepared by scanning probe microscope lithography [4]. Photoluminescence (PL) intensity was improved by adjusting the silica-coating process with tetraethoxysilane. Nanoholes of different sizes were prepared on a Si substrate by scanning probe oxidation and selective etching. The technique enabled the arrangement of QD having an arbitrary energy structure at an arbitrary position on a substrate, which will aid in the fabrication of future nanosize solid devices such as quantum information circuits. We investigated a method of forming a perfect QD superlattice film, in which each QD has the same plane orientation, by depositing faceted colloidal PbS QDs in solution [5]. QD facets were controlled by adjusting synthesis temperature. X-ray evaluation showed that alignment of crystal orientations of the film was improved by the facets. Slow deposition also promoted the crystal alignment. Red shift of PL wavelength suggested that the inter-QD connection of the wave function was better so that the quantum size effect was further reduced with faceted QDs. In the presentation, we will also review how the QD arrangement was modified by using nanoholes formed by anisotropic wet etching on a substrate. References: [1] K. Mukai, special issue of Journal of Nanoscience and Nanotechnology vol.14, pp.2148 (2014). [2] T. Nozaka, and K. Mukai, Physica E: Low-Dimensional Systems and Nanostructures vol.78, pp.14 (2016). [3] T. Nozawa, and Y. Arakawa, Appl. Phys. Lett. vol.98, pp.171108 (2011). [4] K. Mukai et al., Jpn. J. Appl. Phys. vol.57, pp.04FH01 (2018). [5] K. Mukai et al., Jpn. J. Appl. Phys. vol.57, pp.04FS02 (2018).

Biography:
Kohki Mukai received ph.D. in Electronics Engineering from Kyoto University, Japan. He is a Professor of Graduate School of Engineering, Yokohama National University. In 1999 he realized the first room-temperature continuous-wave lasing of quantum dot (QD) lasers at the optical telecommunication wavelength. His achievements led to the world's earliest establishment of QD's photonic device provider ‘QD Laser, Inc.’. Afterwards, he has engaged in research on quantum information technology and high efficiency solar cells using QDs. He is a winner of many awards such as 'Award of The Field of Technology (research section)' presented by Minister of MEXT Japan.

Jungki Lee
Jungki Lee

Hongik University, Republic of Korea

Title of Talk: Multiple anisotropic elliptical inclusions of arbitrary orientation in an infinite isotropic matrix

Jungki Lee

Hongik University, Republic of Korea

Title of Talk:
Multiple anisotropic elliptical inclusions of arbitrary orientation in an infinite isotropic matrix

Abstract:
A number of analytical techniques are available for the stress analysis of inclusion problems when the geometry of the inclusions is simple and when they are well separated. However, these approaches cannot be applied to more general problems where the inclusions are of arbitrary shape and their concentration is high. Thus the stress analysis of heterogeneous solids often requires the use of numerical techniques based on the finite element method (FEM), or boundary integral equation method (BIEM). However, these methods encounter difficulties in dealing with problems involving infinite media or multiple inclusions. It has been demonstrated that the Volume Integral Equation Method (VIEM) can overcome such difficulties in solving a large class of inclusion problems. One advantage of the volume integral equation method over the BIEM is that it does not require the use of Green’s functions for both the matrix and the inclusions. In addition, the VIEM is not sensitive to the geometry or concentration of the inclusions. Moreover, in contrast to the FEM, where the full domain needs to be discretized, the VIEM requires discretization of the inclusions only. In this paper, the effects of orientation angle on the elliptical inclusions are considered for square or hexagonal packing of orthotropic inclusions embedded in an unbounded isotropic elastic matrix under uniform remote tensile loading. The elliptical inclusions are assumed to have different orientations relative to the loading direction. Of special interest here is the influence of the packing type, orientation angle, aspect ratio and concentration of the inclusions on the stresses at the matrix-inclusion interface. It is demonstrated that the Volume Integral Equation Method (VIEM) is very accurate and effective in calculating the local stresses for these types of composites. Acknowledgements This research was supported by 2017 Industry-University-Research Institute Collaboration Technology Development Program through the Ministry of SMEs and Startups (C0563884).

Biography:
Jungki Lee is a Professor with the Department of Mechanical and Design Engineering, Hongik University (Sejong Campus), South Korea. He received a Ph.D. in Mechanical Engineering from the University of California, Los Angeles (UCLA), USA, in 1994. His research interests include computational mechanics of solids, composite materials, and nondestructive evaluation. He has developed the Volume Integral Equation Method (VIEM) with Professor Mal at UCLA. He has published more than 20 papers based on the VIEM in well-known international journals.

Rong Liu
Rong Liu

Carleton University 1125 Colonel By Drive, Canada

Title of Talk: Corrosion performance of Stellite 6 alloy and 17-4PH stainless steel in amine solutions

Rong Liu

Carleton University 1125 Colonel By Drive, Canada

Title of Talk:
Corrosion performance of Stellite 6 alloy and 17-4PH stainless steel in amine solutions

Abstract:
The corrosion behavior of Stellite 6 alloy and 17-4PH stainless steel in amine solutions is studied using electrochemical test methods, simulating the boiler feed water service condition of coal power plants. Morpholine, cyclohexylamine, and sodium hydroxide (NaOH) solution with pH 9.5 are selected to be the corrosive media. The first solution is a typical amine medium, the second one is selected to examine if different amine media with the same pH can result in any change in the corrosion behavior of these materials. Sodium hydroxide is chosen to offset the effect of pH change. Polarization test is performed on Stellite 6 alloy and 17-4PH stainless steel under the low potential varying from -0.4 VSCE to 1.2 VSCEand is also conducted under a constant high potential (4 VSCE) in order to fail the sample surfaces. The polarization curves 17-4PH stainless steel from the low potential tests show an apparent passivation region indicating a protective oxide film formed on the sample surface, but Stellite 6 alloy only exhibits a tendency to passivate. The Stellite 6 alloy and 17 4PH stainless steel samples after the failure tests under the high potential (4 VSC) are analyzed using SEM/EDX. It is shown that the former is severely corroded in all the solutions while the latter is only corroded in morpholine solution and it is very corrosion-resistant in sodium hydroxide solution. The corrosion mechanisms of Stellite 6 alloy and 17 4PH stainless steel in amine solutions are discussed with assistance of the Pourbaix diagrams. Owing to high Cr content, Stellite 6 alloy and 17-4PH stainless steel are able to form Cr rich oxide films on their surfaces in morpholine and cyclohexylamine, sodium hydroxide solution, which have protective effect on the substrates again corrosion. In the potentiodynamic polarization tests under the low potential from 0.4 to 1.2 VSCE, the 17-4PH stainless steel sample surface can be fully oxidized with forming a protective oxide film, and the Stellite 6 alloy sample can be oxidized but the oxide film may not be formed completely.Under the high potential (4 VSCE) in the failure tests, the unstable preformed oxide film in air on Stellite 6 alloy surface is broken in morpholine, cyclohexylamine, and sodium hydroxide solutionat pH 9.5, causing corrosion of the base material. The oxide film on 17-4PH stainless steel exhibits better or more stable behavior than that on Stellite 6 alloy, in that it protects the base material from corrosion, especially in sodium hydroxide solution. Both Stellite 6 alloy and 17-4PH stainless steel do not exhibit resistance to pitting corrosion or erosion/corrosion in morpholine, cyclohexylamine, and sodium hydroxide solution at pH 9.5, because the cyclic polarization curves of these materials all do not have an electropositive hysteresis loop, but the latter is worse than the former since its cyclic polarization curves have a large electronegative hysteresis loop while that of the former not.

Biography:
Rong Liu was born in China on August 25, 1962. She received a Bachelor degree of mechanical engineering from Northeastern University, Shenyang, Liaoning, China, in 1983; a Master degree of mechanical engineering from Northeastern University, Shenyang, Liaoning, China, in 1990; a Master degree of materials engineering from University of Wollongong, Wollongong, New South Wales, Australia, in 1995; a Ph.D. degree of mechanical engineering from Deakin University, Geelong, Victoria, Australia, in 1998. She was a Mechanical Engineer of Shenyang Aluminum Magnesium Engineering and Research Institute, China, during 1983 to 1987 and 1990 to 1994. She was a Postdoctoral Fellow of the Department of Chemical and Materials Engineering, University of Alberta, Canada, during 1998 to 2000. She was an Assistant Professor of the Department of Mechanical and Aerospace Engineering, Carleton University, Canada, during 2000 to 2005. She was an Associate Professor of the Department of Mechanical and Aerospace Engineering, Carleton University, Canada, during 2005 to 2012. She was a Full Professor of the Department of Mechanical and Aerospace Engineering, Carleton University, Canada, from 2012 until now. Professor R. Liu is a member of the American Society for Metals (ASM) and a member of the Professional Engineers of Ontario (PEO), Canada.

L.J. Huang
L.J. Huang

Harbin Institute of Technology, China

Title of Talk: Superhigh mechanical properties of (Ti5Si3+TiBw)/Ti composites with two-scale network architecture

L.J. Huang

Harbin Institute of Technology, China

Title of Talk:
Superhigh mechanical properties of (Ti5Si3+TiBw)/Ti composites with two-scale network architecture

Abstract:
In order to remarkably enhance the mechanical properties of titanium alloys, titanium matrix composites(TMCs) with special reinforcement distribution were designed and fabricated. The fabricated network structured TiBw/Ti composites exhibited a superior combination of mechanical properties, such as, the tensile strength and the tensile elongation can be controlled in the ranges of 1100-1500MPa and 3-13%, respectively. In addition, the high temperature tensile strength can be reached 980MPa and 780MPa at 600oC and 700oC, respectively. Recently, in order to further enhance their properties, (Ti5Si3+TiBw)/Ti6Al4V composites with two-scale network architecture were designed and successfully fabricated by reaction hot pressing. TiB whiskers (TiBw) were synthesized in situ around the Ti6Al4V matrix particles and formed the first-scale network structure. Ti5Si3 needles (Ti5Si3) were precipitated in the β phase around the exquiaxed α phase and formed the secondary-scale network structure. The results showed that the two-scale network structured composites exhibited more superior performances, such as, strength and ductility at room and high temperatures, high temperature oxidation resistance, high temperature creep resistance, and so on. The high compressive strength can be increased to 2300MPa after heat treatment. The tensile strength can be increased to 1050MPa and nearly 900MPa at 550oC and 600oC for Ti6Al4V matrix composites (Ti6Al4V alloys just service at 400oC). In addition, the creep rate of the composites remarkably reduced by an order of magnitude compared with Ti6Al4V alloys. Moreover, the rupture time of the composites increased by 20 times, compared with Ti6Al4V alloys at 550 oC/300 MPa. The superior creep resistance is attributed to the two-level hierarchical structures and the two-scale reinforcements. The micro-TiBw reinforcement distributed in the first network boundary around Ti6Al4V matrix contributed to creep resistance primarily by blocking grain boundary sliding, while the nano-Ti5Si3 particles in the secondary network boundary (β phase) around α phase mainly by hindering phase boundary sliding. In addition, the nano-Ti5Si3 particles dissolved to smaller nano-Ti5Si3 particles precipitated at α/β interface during creep deformation due to high temperature and external stress, which further enhanced the creep resistance greatly. Finally, the creep-rate during steady-state stage was even unpreceded decreased. Fig. 1 Schematic illustration and SEM micrograph of (Ti5Si3+TiBw)/Ti6Al4V composites with two-scale network architecture

Biography:

Valeriy Ryabov
Valeriy Ryabov

National Research Centre "Kurchatov Institute", Russia

Title of Talk: Reconsideration of Continual and Statistical Mechanics Based on Scalar Representation of Deformation

Valeriy Ryabov

National Research Centre "Kurchatov Institute", Russia

Title of Talk:
Reconsideration of Continual and Statistical Mechanics Based on Scalar Representation of Deformation

Abstract:
Theory of particle and continuous mechanics is developed which allows a treatment of deformation in terms of molecular variables “coordinate-momentum-force” instead of the standard treatment in terms of tensor-valued variables “strain-stress”. The new concept is based on a representation of the classical mechanics on the surface of Euclidean 6-torus. The six parameters representingthe topological dimensions of the torusare responsible for three stretches and three angles related to their orientationin a deformed body. A withdrawal of thestrain descriptionfrom the real 3D coordinate system to an extended one changes and simplifies essentially all computational basis in particle, continual and statistical mechanics. Instead of stress-strain relation the new constitutive equationscontain a dependence of generalized tension forces acting on each atom (or small element of mass) on scalar deformation parameters. In other words, any notions of surface or volume forces could be excluded from statistical and continual mechanics. The novel concept generates a new type of ensemble with constant tension forceNfE.Much more simple principle of virtual work implicit theregivesa serious advantage overthe widespread isostress ensembleNtEinmolecular dynamics (MD)simulations.Besides, the equality ofinternal tension forces to the boundary forces (traction)enables a fully atomistic MD calculationsof deformation.In thermodynamical limit, instead of the pressure and volume as state variables this ensemble employs deformation force measured in energetic unit and stretch ratio. So the changes might be spread even to formulas in schooltext books. The governing equations of nonlinear elastostatics for inhomogeneous mediumare also formulated.Unlike to the standard theory here is no need for the compatibility conditionsor the Saint-Venant’s principle to justify solutions to boundary value problems in elasticity theory.It suggests completely different strategy in continual mechanic’s computations. The conventional algorithms use a finite element analysis for strain-driven constitutive equation. Unlike this, containing no differential relations in deformation gradient, a discretization schema in terms of scalar deformation variables is dealing directly with coordinate dependence of large scale deformation based on fully atomistic foundation. But the most important consequence of derived approach is that the continual mechanics ceases to be separated and independent branch of theoretical physics going over to a part of particle physics. Several key examples illustrate the implementation of the new theory in calculations of statics and dynamics of deformed body. Referencies 1. V.A. Ryabov, Mechanics of deformations in terms of scalar variables. Cont. Mech. Thermodyn. Springer, 29, 3, 715 (2017). 2. V.A. Ryabov, Implementation of isotension ensemble in molecular dynamics. Comp. Meth.Appl. Mech. and Eng., Elsevier, acceptedfor publication (2018).

Biography:

Rong Liu
Rong Liu

Carleton University, Canada

Title of Talk: Corrosion performance of Stellite 6 alloy and 17-4PH stainless steel in amine solutions

Rong Liu

Carleton University, Canada

Title of Talk:
Corrosion performance of Stellite 6 alloy and 17-4PH stainless steel in amine solutions

Abstract:
The corrosion behavior of Stellite 6 alloy and 17-4PH stainless steel in amine solutions is studied using electrochemical test methods, simulating the boiler feed water service condition of coal power plants. Morpholine, cyclohexylamine, and sodium hydroxide (NaOH) solution with pH 9.5 are selected to be the corrosive media. The first solution is a typical amine medium, the second one is selected to examine if different amine media with the same pH can result in any change in the corrosion behavior of these materials. Sodium hydroxide is chosen to offset the effect of pH change. Polarization test is performed on Stellite 6 alloy and 17-4PH stainless steel under the low potential varying from -0.4 VSCE to 1.2 VSCE and is also conducted under a constant high potential (4 VSCE) in order to fail the sample surfaces. The polarization curves 17-4PH stainless steel from the low potential tests show an apparent passivation region indicating a protective oxide film formed on the sample surface, but Stellite 6 alloy only exhibits a tendency to passivate. The Stellite 6 alloy and 17-4PH stainless steel samples after the failure tests under the high potential (4 VSC) are analyzed using SEM/EDX. It is shown that the former is severely corroded in all the solutions while the latter is only corroded in morpholine solution and it is very corrosion-resistant in sodium hydroxide solution. The corrosion mechanisms of Stellite 6 alloy and 17-4PH stainless steel in amine solutions are discussed with assistance of the Pourbaix diagrams.

Biography:

Natalya Froumin
Natalya Froumin

Ben-Gurion University of the Negev, Israel

Title of Talk: Characterization of the Fluorescent Nanodiamond for Biological Applications

Natalya Froumin

Ben-Gurion University of the Negev, Israel

Title of Talk:
Characterization of the Fluorescent Nanodiamond for Biological Applications

Abstract:
Frontier applications of biology require smaller and smaller particles to conduct nvestigations. These particles need to be effectively monitored (fluorescent) and inherently biocompatible in order to improve our understanding of phenomena occurring at the single cell level. Though efforts to drive large scale production (5-10g batches) of stable sub-10nm fluorescent diamond particles containing NV centers will undoubtedly continue, carbon dot decorated 5nm diamond particles produced by detonation synthesis offer an alternative for fabrication of fluorescent sub-10nm particles. In this work we present the results of the study of the carbon dot containing nanodiamonds produced via detonation of an oxygen-deficient explosive mixtures of trinitrotoluene and hexogen (50:50 wt.%). The obtained nanodiamonds were analyzed by Nuclear Magnetic Resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), Electron Paramagnetic Resonance (EPR), and Photoluminescence (PL) Spectroscopy. While the unique spin properties that are often exploited for NV centers are not a feature of the carbon dot decorated diamonds, the overall brightness of the carbon dots appears to be comparable to that of commercially available HPHT diamonds containing NV centers at small sizes and similar excitation lines. This fact, coupled with the inherent biocompatibility of the material suggests that it can be used as a fluorescent biomarker.

Biography:

José Francisco Lopes Filho
José Francisco Lopes Filho

Universidade Estadual Paulista, Brazil

Title of Talk: Microstructure and thermal and functional properties of biodegradable films produced using zein

José Francisco Lopes Filho

Universidade Estadual Paulista, Brazil

Title of Talk:
Microstructure and thermal and functional properties of biodegradable films produced using zein

Abstract:
Research is being conducted in an attempt to produce biodegradable packaging to replace plastic products, thereby reducing solid waste disposal. In this work, zein films were produced from vegetable oils (macadamia, olive and buriti) and from pure oleic acid. The surface of zein-based films made using oleic acid has a good lipid distribution. The high content of oleic acid produced a film with the greatest elongation at break (8.08 ± 2.71%) due to the greater homogeneity of the protein matrix. The different oils did not affect the glass transition temperature (Tg). Tg curves of films with fatty acids showed a reduction in mass at between 50 and 120°C due to water evaporation. At 120°C the weight loss was 3-5% and above this temperature further weight loss was observed with the highest loss being seen in the film made using pure oleic acid. In conclusion, although biodegradable films were produced using the four different oils, the film made from pure oleic acid has the best characteristics. Keywords: biodegradable films, biomaterial, zein.

Biography:
Graduate in Food Engineering from Universidade Federal de Viçosa (1979), master's at Science and Technology of Food from Universidade Federal de Viçosa (1983) and Ph.d. in Agricultural Engineering from University of Illinois (1995). Full professor at UNESP, University in Brazil. Has experience in Agricultural Engineering, focusing on Engineering of Processing of Agricultural Products, acting on the following subjects: maize - milling, maize co-products, food technology, maize - steeping. Utilization of zein maize protein to produce Biomaterial";

Muhammad Ajmal
Muhammad Ajmal

University of Wah

Title of Talk: Synthesis and characterization of stimuli responsive poly(N-vinylcaprolactum-co-itaconic acid) microgel containing silver nanoparticles with tunable optical and catalytic properties

Muhammad Ajmal

University of Wah

Title of Talk:
Synthesis and characterization of stimuli responsive poly(N-vinylcaprolactum-co-itaconic acid) microgel containing silver nanoparticles with tunable optical and catalytic properties

Abstract:
In this work, we prepared poly (vinylcaprolactum-co-itaconic acid) microgel by free radical polymerization. Silver nanoparticles were prepared in synthesized microgel networks by in situ reduction of Ag + ions which were loaded in microgel from aqueous solution of AgNO3. The prepared microgel was characterized by Fourier Transformation Infra Red Spectroscopy, UV-Visible spectroscopy, Fluorescence Spectroscopy, X-Ray Diffraction, Laser Light Scattering, Thermal Gravimetric Analysis, Differential Scanning Calorimetry and Transmission Electron Microscopy. Swelling behavior of microgel was studied as a function of temperature and pH. The microgel was found to be in swollen state at low temperature and basic medium while in collapsed state at high temperature and acidic medium. A slight decrease in swelling capacity of microgel was observed after the fabrication of silver nanoparticles. A red shift was observed in surface plasmon resonance wavelength of silver nanoparticles with pH induced swelling of microgel. Catalytic activity of the composite microgel was studied by using them as catalyst for the reduction of 4-nitrophenol. Effects of temperature and catalyst dose were also investigated. Activation energy for the catalytic reduction of 4-nitrophenole was found to be 28.4KJ/mol. The change in catalytic performance and shift in absorption maxima of composite microgel as a function of temperature and pH reveals that this system has potential to be used as tunable catalyst and optical sensor.

Biography:
Dr. Muhammad Ajmal is working as assistant Professor of Physical chemistry at Department of Chemistry, University of Wah, Pakistan. Dr. Ajmal Completed his PhD with specialization in Physical Chemistry from Quaid-i-Azam University Islamabad, Pakistan in 2016. He is working on synthesis of polymer hydrogels, fabrication of nanomaterials in hydrogels, and their applications in adsorption and catalysis. He has published 15 research articles in international journals.

Hadj Hamaizi
Hadj Hamaizi

University of Oran, Algeria

Title of Talk: Extraction of Creatinine by adsorption onto Pure Micro-And Mesoporous Silica materials

Hadj Hamaizi

University of Oran, Algeria

Title of Talk:
Extraction of Creatinine by adsorption onto Pure Micro-And Mesoporous Silica materials

Abstract:
This report describes the compositional and structural design strategy of a micro- and mesoporous silica materials mesh for the efficient removal of uremic toxins towards blood purification application. A series of mesoporous textured amorphous silica powdered samples have been prepared using non-ionic polyoxyethylene alikali surfactants which are inexpensive, biodegradable, and non-toxic materials. A cubic structure and a more or less orderly porosity are obtained from a highly acidic reaction mixture using tetraethylorthosilicate (TEOS) As expected, the nature of the surfactant used (i.e. CnH2n+1(EO)x-OH type) influences the porous structure and leads to pores in the order of 2 (microporous) to 4 nm (mesoporous) in addition to thick silica walls. Calcined materials lead amorphous silica with no toxicity; therefore, they have the potential to be utilized as a new approach to removing creatinine selectively from the bloodstream. Key words: Synthesis; Mesoporous silica; Creatinine; Adsorption

Biography:

Nursel Pekel Bayramgil
Nursel Pekel Bayramgil

Hacettepe University, Turkey

Title of Talk: COMPOSITES OF ACID-MODIFIED GRAPHENE WITH POLYETHYLENIMINE AND VINYLIMIDAZOLE

Nursel Pekel Bayramgil

Hacettepe University, Turkey

Title of Talk:
COMPOSITES OF ACID-MODIFIED GRAPHENE WITH POLYETHYLENIMINE AND VINYLIMIDAZOLE

Abstract:
Graphene is the last shining star in material physics and intensified matter physics.Graphene represents a conceptually new class of materials that are only one atom thick, and, on this basis, offers new inroads into low-dimensional physics that has never ceased to surprise and continues to provide a fertile ground for applications. In our study, firstly graphene was modified by some strong acids to make easy compatibility to other ingredients. Secondly, composites of acid-modified graphene with polyethylenimine and vinylimidazole were prepared and made their characterizations using different instrumental analysis methods such as FTIR, XRD, SEM, Elemental analysis, TEM, and Raman Spectroscopy.

Biography:

G. K. Elyashevich
G. K. Elyashevich

Russian Academy of Sciences, Russia

Title of Talk: Hybrid electroactive polymer hydrogels as 3D electrode materials for supercapacitors

G. K. Elyashevich

Russian Academy of Sciences, Russia

Title of Talk:
Hybrid electroactive polymer hydrogels as 3D electrode materials for supercapacitors

Abstract:
Conducting polymers are promising materials for the application in various fields [1]. The elaboration of composite systems based on conducting polymer providing through conductivity to the material and polymer matrix which supports mechanical integrity, strength and elasticity of the material is a perspective way to form 3D electrode material for energy storage [2]. This study was aimed to obtain novel electoactive supercapasitor materials based on swelling hydrogels and electroconducting polymers. New methods to prepare these materials using polyacrylamide (PAAm) as hydrogel matrix and electroconducting polyaniline (PANI) as active component were elaborated. The influence of the composition and structure of the material on electrochemical activity and specific capacity have been investigated. The specific capacity of the samples has been calculated using the data on galvanostatic charge discharge cycling, and the stability of the capacity at cycling has been evaluated. The contributions of the electronic and ionic constituents of electric conductivity have been determined. Swelling degree in various media was measured. The cyclic voltammetry, electrochemical impedometry, mechanical stress-strain curves at uniaxial compression and deformation behavior at cyclic stress were used to characterize the samples. It is shown that the systems are characterized by uniform distribution of the polyaniline phase consisting of the structure elements in the form of nanofibers with sizes 500 × 50 nm in the volume of hydrogel. It was proved that the samples under study are hybrid systems, i.e., they are bound by physical and chemical crosslinks, both, and demonstrate the equilibrium swelling ability. The obtained PANI/PAAm hydrogels are the electroactive ones, and they retain the values of specific capacity about 300 F/g at charge-discharge cycling, which indicates that the electroactive properties of these samples are very stable.

Biography:
Prof. Galina K. Elyashevich, Chief Staff Scientist, Laboratory of Polymer Physical Chemistry, Institute of Macromolecular Compounds, Russian Academy of Sciences (IMC RAS) Education: 1959, MSc., Leningrad State University, Department of Physics, Leningrad. 1975, PhD in Polymer Physics, IMC RAS, Leningrad. 1984, Dr. Sci. in Polymer Physics, IMC RAS, Leningrad. Main fields of study: orientation phenomena in melts and solutions of polymers, structure and mechanical properties of oriented polymer systems, liquid-crystalline polymers, porous polymer systems, microporous films, polymer membranes, hydrogels, electrically conducting polymers . Author of more than 400 publications, 7 monographs and 6 Patents of Russian Federation.

Yiming Li
Yiming Li

Northeast ForestryUniversity, China

Title of Talk: Pavement Performance Effect of DTDM on SBR Modified Asphalt and Mixture

Yiming Li

Northeast ForestryUniversity, China

Title of Talk:
Pavement Performance Effect of DTDM on SBR Modified Asphalt and Mixture

Abstract:
SBR modified asphalt is a kind of modified asphalt with good low temperature performance. However, although its high temperature stability is a little better than that of the base asphalt, it can not satisfy demand of the hot region. In order to improve pavement performance of SBR modified asphalt and mixture, DTDM is used to crosslink with the butadiene styrene rubber through changing traditional way of physical mixing. Performance of modified asphalt with different content of SBR and DTDM and the high temperature stability, water stability and low temperature cracking resistance of mixed materials were tested so that comparative analysis could be carried out. Results showed that the high temperature performance was slightly improved with the addition of SBR, while the low temperature performance was obviously improved. It can be indicated that 4% SBR content is proper. The addition of DTMD changed the distribution structure of SBR in asphalt, improved the compatibility of polymers with asphalt and formed a crosslinked structure so that the elastic recovery and high temperature performance of modified asphalt were improved. The rutting stability of SBR modified asphalt was increased by about 45% and TSR was improved by 10% after the addition of DTDM. The failure strain of modified asphalt after crosslinking was 1.4 times than that without crosslinking, which could indicate that the addition of DTDM improved the pavement performance of SBR modified asphalt mixture.

Biography:
Ph. D student. Yiming Li, who majors in Road and Railway engineering, is a Student at Northeast Forestry University.

Wanli Kang
Wanli Kang

China University of Petroleum, China

Title of Talk: Preparation and characterization of dispersed low elastic polymer microspheres used for conformance control treatment

Wanli Kang

China University of Petroleum, China

Title of Talk:
Preparation and characterization of dispersed low elastic polymer microspheres used for conformance control treatment

Abstract:
Dispersed low elastic polymer microsphere system(DLEPMS), which consists of low elastic polymer microspheres and polymers, is a novel suspension system for confromance control treatment in heterogeneous reservoirs. In this paper, one kind of low elastic polymer microsphere with storage modulus (G’) of 23.6 Pa was prepared by inverse suspension Polymerization. Experiments were performed to characterize the morphology of the synthetic low elastic polymer microspheres. The stability and rheological property of DLEPMS were investigated using stability analyzer and rheometer. In the flow and displacement experiments, parallel-sandpack models and microscopic visualization model were used to study the micro migration mechanism of low elastic microsphere. The stability evaluation standard of DLEPMS was established. Meanwhile the growth in diameter and microscopic migration characteristics of microsphere in DLEPMS were researched. A kind of DLEPMS with well stability was optimized. The regulatory factors of viscoelasticity of DLEPMS were proposed. Using the "cluster" theory, the mechanism of shear thickening and the energy dissipation behavior of the system were revealed. Studies have shown that DLEPMS at high shear rates can easily form a "cluster", exhibiting shear thickening behavior; the dissipation energy increases with the increase of the shear angle frequency. The quantitative corelation between the performance parameters of low elastic polymer microspheres and the pore throat size and the crack width were established. The migration mechanism in porous media was described. There are five ways for the migration of low elastic polymer microspheres in porous media: deformable passing through, partition passing through, blocking, adhesion and directly passing through. The water plugging rate is greater than the rate of oil in the same permeability cores. The DLEPMS cause less damage to the low permeability layer, displaying good effects of selective profile control and turning fluid direction capability. For the higher permeability ratio, the better profile improvement effect when the high permeability layer was fixed. The research could provide a good theoretical guidance and technical support for the development of DLEPMS.

Biography:

Yoshitaka NARA
Yoshitaka NARA

Kyoto University, Japan

Title of Talk: Effect of calcium ion concentration on resistance to fracturing in rock in water

Yoshitaka NARA

Kyoto University, Japan

Title of Talk:
Effect of calcium ion concentration on resistance to fracturing in rock in water

Abstract:
Considering the development in the human society and the technology, the utilization of a rock mass is essential for mining mineral resources, constructing the structures such as repositories of radioactive wastes and the underground power plants, and storing carbon dioxide in the underground. For this purpose, information and knowledge of mechanical property, especially the property of fracturing in rock are required. It has been known that the strength and fracture propagation in rock are affected by the surrounding environment. The strength of rock in water is lower than that in air. For the measurement of subcritical crack growth, it has been clarified that the crack velocity in rock in water is much higher than that in air. It has been clarified that the fracture toughness of rock in water is lower than that in air. In addition, the long-term strength of rock in water is lower than that in air. Considering the construction of structures such as the repository of radioactive wastes and the underground power plant in a rock mass, the concentration of the calcium ion in the groundwater can be high. However, it has not been investigated the influence of the calcium ion concentration in water on the fracturing in rock. In this study, we investigated the influence of the calcium ion on the fracture toughness of rock in water. We measured the fracture toughness of rock in distilled water and calcium hydroxide solution using Double Torsion method. It was shown that the fracture toughness of rock in calcium hydroxide solution was higher than that in distilled water. Especially, the increase of the fracture toughness of tuff was more significant than that of sandstone. It was recognized that the precipitation of calcium compounds (calcium carbonates) occurred on all rock specimens used in the measurements in calcium hydroxide solution. It was considered that the precipitation of calcium compounds on the crack influenced the resistance to fracturing in rock and then brought about the increase of the fracture toughness. It is concluded that the precipitation of minerals can ensure the mechanical stability of rock materials.

Biography:
I have completed my doctorate in March 2004 in Hokkaido University in Japan. I’ve been a Postdoc in Hokkaido University from 2004 to 2008. Then I have been a Postdoc in University College London in UK from 2008 to 2010. From 2011 to 2014, I have belonged to Kyoto University in Japan as Assistant Professor. From 2014 to 2016, I have belonged to Tottori University as Associate Professor. From April 2016, I am working in Kyoto University as Assistant Professor. I have mainly investigated the fracturing, strength, and permeability of rocks and cementitious materials.

Mieke Luiten-Olieman
Mieke Luiten-Olieman

University of Twente, Netherlands

Title of Talk: Hybrid silica membranes for selective separation of small gasses under hydrothermal conditions

Mieke Luiten-Olieman

University of Twente, Netherlands

Title of Talk:
Hybrid silica membranes for selective separation of small gasses under hydrothermal conditions

Abstract:
The hydrothermal stability of microporous ceramic membranes is of high importance for implementation of these membranes in industry, as a lot of industrial processes include steam. Here, we present the results of a study on the hydrothermal stability of a ceramic membrane system consisting of an intermediate γ-alumina layer and a hybrid, ethylene-bridged, silica separation layer. Also, the influence is investigated of the addition of a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer on the membrane stability. The results show that the hybrid silica on γ-alumina retains its gas separation performance after a hydrothermal treatment, while a bare γ-alumina layer is degraded during a hydrothermal treatment. On the other hand, the hybrid silica on a MAP-modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a hydrothermal treatment of the hybrid silica on a MAP modified γ-alumina membrane results in a significant increase in the H2/N2 (perm)selectivity of a factor 3. Also the influence of the amount of water (RH<0.5% or 90%) in the support on the dipcoating/gelation process was examined. No detectable permeation of N2 was observed for RH<0.5% but a RH> 90% resulting a significantly higher N2 permeation. The formation of larger pores can be understood by a higher condensation rate and longer drying times when more water is present. This results in a stronger network that better withstands the compressive forces during drying. By limiting both the water and acid contents in the dip sol, a more dense pore structure is obtained that gives the highest H2/N2 and CO2/CH4 (perm)selectivity’s found to date for hybrid silica membranes.

Biography:
Dr. Ing. Mieke Luiten-Olieman graduated in 1992. For more than 11 years, she worked as a research assistant in various projects in the Inorganic Membrane group, focusing on the development of porous ceramic membranes gas separation membranes, flat and tubular geometry. During her PhD research she worked on the development of a preparation methodology for high quality inorganic porous membranes with large membrane surface area and received her PhD in March 2012. Currently she is works as a researcher in the Inorganic Membrane group in several projects in the field of materials science and membrane technology.

Alex Frolov
Alex Frolov

Kurchatov institute, Russia

Title of Talk: Evolution of the structural-phase state of RPV claddings material under the influence of operational factors

Alex Frolov

Kurchatov institute, Russia

Title of Talk:
Evolution of the structural-phase state of RPV claddings material under the influence of operational factors

Abstract:
At the present time, a zirconium-based alloy with 1% niobium (E110) is used as the main material for shells of fuel elements of VVER-type reactors because it has good processability, acceptable radiation resistance, and a quite small thermal neutron capture cross section. In the course of reactor operation, the radiation-induced structural elements (dislocation loops, second phases (for example, phases based on niobium and zirconium, which form periodic structures), vacancy voids) are formedin alloys based on zirconium.This causes the degradation of mechanical properties - reduced plasticity, an increase in the yield strength, etc.However, at present, there is practically no quantitative the contribution assessment of various radiation-induced structural components to the degradation of mechanical properties. In this work, studies of zirconium samples (from fuel claddings) in different states were carried out (in the initial state and after irradiation under VVER-1000 conditions). Microstructural studies were carried using transmission (FEI Titan 80-300) and scanning electron microscopy (Zeiss Merlin), as well as atomic-probe tomography (Camceca LEAP 4000 HR): the phase composition (density, size and composition of the second phases) is determined, the dislocation structure is assessed (the density of dislocations and dislocation loops, the plane and the Burgers vector are established). Thus, the basic degradation mechanisms of the E110 alloy under the influence of operational factors were established.

Biography:

Hichameldin Mahfoz Kotb
Hichameldin Mahfoz Kotb

King Faisal University, Saudi Arabia

Title of Talk: Giant Dielectric Na1/2La1/2Cu3Ti4O12 Nanoceramics by Spark Plasma Sintering

Hichameldin Mahfoz Kotb

King Faisal University, Saudi Arabia

Title of Talk:
Giant Dielectric Na1/2La1/2Cu3Ti4O12 Nanoceramics by Spark Plasma Sintering

Abstract:
Giant dielectric constant (GDC) materials (ε′>103) [1-4] have potential use in various electronics applications. One of the most promising GDC materials is CaCu3Ti4O12 (CCTO) as it has the special properties: room temperature dielectric value of ∼104–105 that is independent of temperature and frequency over wide ranges. In the present study we report on the giant dielectric behavior of CCTO-like ceramic: Na1/2La1/2Cu3Ti4O12 (NLCTO). Nano powder of Na1/2La1/2Cu3Ti4O12 (NLCTO) was synthesized by mechanochemical milling of stoichiometric amounts of high-purity La2O3, TiO2, CuO and Na2CO3 in 2-prpoanol medium. Dense ceramics of NLCTO were obtained by Spark Plasma Sintering at 925 °C, 950 °C, 975 °C and 1000 °C for 10 min. X-ray powder diffraction analysis showed that pure perovskite-like CCTO phase was obtained for the prepared ceramics. Scanning electron microscope observations revealed an increase in the average grain size from 200 nm to 1.2 μm with increasing the sintering temperature (Figure 1). Impedance spectroscopy studies performed in a wide frequency range (1- 10 MHz) and at various temperatures (120 −470 K) have been used to study the dielectric and electrical properties of NLCTO ceramics. All the studied ceramics showed giant dielectric constant (ε’>103) over a wide range of frequencies (Figure 2). Impedance complex plane analysis showed that the studied ceramics are electrically heterogeneous: semiconductive grains surrounded by electrically resistive grain-boundaries. The observed dielectric properties were explained in terms of was explained in terms of the internal barrier layer capacitance [5] effects.

Biography:
Dr Hichameldin Mahfoz Kotb was born in Assiut, Egypt. He received a Bachelor of Science degree in Physics from Assiut University in 1995. He received the Master and PhD in Microelectronics from the University of Rennes 1, France in 2000 and 2004, respectively. Dr Kotb is currently an Associate Professor in the Department of Physics, Faculty of Science, King Faisal University (KSA) on leave from the Department of Physics, Faculty of Science, Assiut University (Egypt). Dr Kotb authored or coauthored over 24-refereed articles in the area of Mircoelectronics Technology, Gas Sensors, Thin films and Metal Oxide Dielectric Ceramics.

Nesrine Kassem
Nesrine Kassem

Title of Talk: Addition of Treated Leather Shavings in Bagasse Paper Sheets

Nesrine Kassem

Title of Talk:
Addition of Treated Leather Shavings in Bagasse Paper Sheets

Abstract:
Leather industry generates large amounts of wastes, most of them are burned causing environmental pollution. This study aims to use these wastes as filler in bagasse pulp before sheet formation, as a novel method. Leather shavings were subjected to multistage disintegration to prepare powder, then treated with different monomers and applied in paper sheets. The formed sheets exhibit a considerable improvement in some of their properties such as tear, water resistance, air permeability, and thermal stability. Only breaking length was affected by adding untreated and treated leather shavings. Consequently, the resulting paper sheets have potential for application in wrapping and packaging industries.

Biography:

Yu-Tai Tao
Yu-Tai Tao

Institute of Chemistry, Academia Sinica, Taipei, TAIWAN

Title of Talk: Organic Transistor Memory with Self-assembled Monolayer as Charge-Storage Floating Gate

Yu-Tai Tao

Institute of Chemistry, Academia Sinica, Taipei, TAIWAN

Title of Talk:
Organic Transistor Memory with Self-assembled Monolayer as Charge-Storage Floating Gate

Abstract:
Organic memory device constitutes an essential component for data processing, storage and communication in realizing all-organic electronic devices. Among various types of memory devices, transistor-based memory device is attractive for the structural integration. The memory effect can be achieved in a transistor by inserting a charge-trapping floating gate between the semiconductor and the gate dielectric to give the electric bistability needed in the memory function. We have assessed carrier traps based on metal nanoparticles, conjugate diacetylenic polymer, self-assembled monolayers for their role as floating gate in fabricating the transistor memory device.1-4 The performance characteristics such as width of memory window, switching response time, memory retention time are dependent on the structure of the charge trapping moieties, which allow some room for rational design. In this presentation, a flexible, low-voltage and non-volatile memory device is designed by implanting a single molecular layer on aluminum oxide dielectric surface in a pentacene-based organic transistor. The monolayer-forming molecule contains different functional core groups flanked between two alkyl chain spacers. The memory characteristics strongly depend on the type of monolayer used due to localized charge trapping in different core groups, including diacetylenic unit (DA) as the donor, naphthalenediimides unit (ND) as the acceptor, and the ones with both DA and ND in the same molecule, respectively. The device with the molecule containing both donor DA and acceptor ND shows better device performance than others in terms of memory window and retention time. This hybrid organic monolayer/inorganic dielectric device also exhibited rather stable device characteristics upon bending of the substrate. The simple and low temperature processing procedures of the key elements (self-assembled monolayer) could be integrated with large area flexible electronics applications.

Biography:
Yu-Tai Tao completed his PhD degree from University of Rochester, USA in 1981 and postdoctoral studies from Harvard University, USA in 1984. He started his career in teh Institute of Chemistry, Academia Sinica, Taiwan as Associate Research Fellow (1984-1990), and became a Research Fellow since 1990. His research interests include Surface chemistry, materials chemistry, self-assembled monolayers, organic molecular electronic materials and devices, including organic light-emitting diodes, organic field-effect transistors, organic memories. He has published more than 140 papers

Jing Liu
Jing Liu

Chinese Academy of Railway Sciences, China

Title of Talk: Use of Closed Cell Microstructure Polymer for Quick Uplift Rehabilitation of Differential Sunken Turnout Zone Ballastless Track

Jing Liu

Chinese Academy of Railway Sciences, China

Title of Talk:
Use of Closed Cell Microstructure Polymer for Quick Uplift Rehabilitation of Differential Sunken Turnout Zone Ballastless Track

Abstract:
The turnout zone ballastless track is an advanced track structure with high stability and integrity. However, due to complicated geological conditions, local groundwater level declined, and many other unavoidable objective reasons, the roadbed foundation of turnout zone ballastless track appeared large uneven settlement deformation, so the above structure also experienced uneven settlement accordingly. Compared with ballast track which could be restored by increasing the ballast under the sleepers simply, the smoothness of turnout ballastless track could only be restored by adjusting the thickness of the base plates of fastener system accordingly. But if continuous settlement deformation exceeded the specified allowed adjustable range of the fastener system, the smoothness of ballastless track diminished, the speed of passing trains had to be limited to ensure the safety. In order to solve this global challenging problem, a closed cell microstructure hydrophobic polymer with low-viscosity, quick-setting, large -expansion ratio and high-strength properties was used for injecting, filling and uplifting under turnout zone ballastless track. Field results indicated this polymer could uplift the turnout zone ballastless track effectively and restore the smoothness of railway tracks accurately.

Biography:

Leonid Rubinovich
Leonid Rubinovich

Ben-Gurion University of the Negev, Israel

Title of Talk: Modeling of Phase Separation in Alloy Nanoparticles: Size-Dependent Diagrams and Finite-Size Scaling

Leonid Rubinovich

Ben-Gurion University of the Negev, Israel

Title of Talk:
Modeling of Phase Separation in Alloy Nanoparticles: Size-Dependent Diagrams and Finite-Size Scaling

Abstract:
Alloy nanoscale particles exhibit distinct chemical and physical properties that lead to increasing numbers of technological applications in heterogeneous catalysis, magnetic and biomedical devices and others. Future developments obviously necessitate the foundation of basic research focusing on the relationship between compositional-structure at the atomic level and desired properties. In the present work phase-separation transitions in binary alloy nanoparticles (NPs) consisting of ~500 up to ~100,000 atoms (~1–10 nm) are modeled in order to furnish nanophase diagrams as well as finite-size scaling (FSS) in terms of the correlation-length critical exponent, . Theoretical framework includes the free-energy concentration expansion method (FCEM) [1] combined with a coarse-grained model (CGLM) [2] and two different energetics as input: (I) a quite simple one involving the “effective pair interactions” (EPI) and equal constituent surface energies (thus, possible influence of surface segregation is excluded); (II) a more realistic one involving Cu and Ni surface energies as well as coordination-dependent bond-energy variations (CBEV) [3]. I) FCEM/CGLM computations for equiatomic composition of fcc rectangular NPs predict at low temperatures an asymmetric Janus-type concentration profile along the [100] separation axis. The data are summed up in nanophase separation diagrams as well as in TC scaling plots giving a correlation-length critical exponent,  = 0.83, attributed to dominant interfacial effects [4]. Variations in  with NP size, as revealed by a refined analysis, are linearly extrapolated, ultimately yielding the known  = 1.0 value. II) Compositional-structures of CuNi TOs are predicted according to the energetically more elaborate CBEV-based modeling. Intra-core quasi-Janus separation under Cu segregated surface takes place in smaller NPs (e.g., containing 586-atoms), and at Cu or Ni rich compositions of larger NPs. In the latter case core-shell configurations become stable at intermediate core compositions. The highly efficient FCEM/CGLM/CBEV modeling facilitates the construction of nanophase complete diagrams for a sequence of size-increasing TOs. NP size-dependent shifts in the critical temperature obey approximately power-law FSS with characteristic . [1] 1. M. Polak and L. Rubinovich, Surface Science Reports, 38, 127 (2000). [2] M. Polak and L. Rubinovich, Phys. Chem. Chem. Phys., 17, 28211 (2015). [3] L. Rubinovich and M. Polak, Phys. Rev. B 80, 045404 (2009). [4] M. Polak and L. Rubinovich, Phys. Chem. Chem. Phys., 18, 18391 (2016).

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).

Mok Tan Ahn
Mok Tan Ahn

Dong-a University, South Korea

Title of Talk: A Study on Optimal Design of Thickness by Bending Angle and Friction Variation in Dual Tube Bending Process by FEM Analysis

Mok Tan Ahn

Dong-a University, South Korea

Title of Talk:
A Study on Optimal Design of Thickness by Bending Angle and Friction Variation in Dual Tube Bending Process by FEM Analysis

Abstract:
The bending process is a process of forming a curved pipe through a mechanical force in the form of a straight pipe. In the bending process, the radius of curvature and the thickness change due to mechanical friction occur in the pipe, which affects the probability of occurrence of cracks in the bending tube and the precision molding. In this study, we investigate the effect of curvature radius and friction coefficient on the thickness variation of each case through experimental design and investigate the radius of curvature and friction coefficient of optimal curvature molding through FEM analysis.

Biography:

Zakaria Boumerzoug
Zakaria Boumerzoug

University of Biskra, Algeria

Title of Talk: A review: welding of dissimilar material

Zakaria Boumerzoug

University of Biskra, Algeria

Title of Talk:
A review: welding of dissimilar material

Abstract:
Actually, there is an increasing industry need to join dissimilar materials. Hybrid parts made by welding of dissimilar materials such as metal to metal, polymer to polymer, metal to polymer, and metal to ceramic are nowadays in high demand because the objective is to reduce the total weight and maintaining essential physical properties. For these reasons, research works on welding of dissimilar materials is very attractive and many scientific papers have been published in this research field. The objective of this paper is to review the metallurgical aspects of the main published works on dissimilar welded materials by presenting the main joining methods used, problems faced and the future research in this area.

Biography:
Zakaria Boumerzoug is a professor of metallic materials at Biskra University. He joined Biskra University in 1992. He obtained his PhD from Constantine University in 1998. He published fifty articles and he participated to more than thirty international conferences as speaker and invited speaker. He was as a member and also as a guest editor in some international conferences. He has supervised 17 PhD students. He has reviewed many articles of some scientific journals. He is a chief of an international project between Biskra University and UMONS University in Belgium. He has a short international teaching experience at Cadiz University, Spain, May 2017( ERASMUS Program). He has organised more than 10 scientific meeting in Algeria.

Arvind Kumar
Arvind Kumar

CSIR-Central Salt and Marine Chemicals Research Institute, India

Title of Talk: Advances in Room Temperature Ionic Liquids and Their Applications in Materials Chemistry

Arvind Kumar

CSIR-Central Salt and Marine Chemicals Research Institute, India

Title of Talk:
Advances in Room Temperature Ionic Liquids and Their Applications in Materials Chemistry

Abstract:
Room temperature ionic liquids (RTILs) are the organic analogues of inorganic molten salts with melting temperature < 100oC.[1] Being ionic in nature, these compounds are versatile in terms of solvent properties such as low volatility, high thermal stability, wide liquid range and good solvating ability. In view of flexibility of choice of cations or anions, RTILs can designed as low viscosity media suitable for self-assembling of amphiphile molecules or also can also be designed as surfactants by incorporating amphiphilic character in either cation or anion or in both the constituents. Therefore, with extraordinary properties it has been possible to include RTILs as media or as a surfactant or both for construction of colloidal formulations/self-assembled structures.[2] Such structures are highly thermally stable and can be used as templates for many applications such as nanoreactors for preservation of biomolecules at elevated temperatures (high temperature enzymatic catalysis) and preparation of shape/size controlled nanomaterials/quantum dots and their hybrid materials for applications such as novel light harvesting materials with enhanced quantum efficiency.[3] The presentation will focus on developments in ionic liquid based surfactants and formulations of thermally stable ionic liquid colloidal systems, characterization and their applications for materials preparation. 1. R. D. Rogers, K. R. Seddon, Science 2003, 302, 792. 2. J. L. Zhang, B. X. Han, J. S. Li, Y. J. Zhao, G. Y. Yang, Angew. Chem., Int. Ed. 2011, 50, 9911. 3. K. Srinivasa Rao, S. So and A. Kumar, Chem. Commun., 2013,49, 8111.

Biography:
Dr. Arvind Kumar did PhD in Chemistry at Kurukshetra University, India currently serves as Principal Scientist & Head, Salt and Marine Chemicals Division at CSIR-Central Salt & Marine Chemicals Institute Bhavnagar, Gujarat. His research interests cover physical chemistry of brine systems, design and development of ionic liquids and their use in green chemistry for sustainable technology. He visted Germany under a DAAD Fellowship-2004-05, and USA, undera CSIR-Raman Research Fellowship 2011-12 and is recipient members of the CSIR Rural Technology Award-2008. He has published over 90 research papers, holds several patents, book chapters and articles in popular magazines.