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International Conference on
Materials Science and Research

November 16-18, 2017 | Dubai, UAE

Program Schedule

  • Sessions:
    Advanced Materials & Computational Materials Science & Materials Chemistry and Physics

    Time:

    Title: High Temperature Materials Development for Power Plant used for Electricity Generation

    R G Faulkner
    Loughborough University, UK

    Biography
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    Biography

    R G Faulkner
    Loughborough University, UK

    Professor Roy Faulkner (Loughborough Materials Ltd) has been involved with nuclear reactor materials research for almost three decades. He was employed as a consultant to UKAEA, Harwell from 1980-90, and has led are search group interested in nuclear reactor materials at Loughborough Universitysince1990,with funding support from Rolls Royce Naval Marine, EDF, Magnox, EPSRC, and Oak Ridge National Laboratories. His interests are in breeder blanket ferritic ODS steel development for fusion, radiation-induced grain boundary segregation of P in Pressure vessel steels, and radiation induced chromium depletion in austenitic steels. Non- irradiation based interests, but still relevant to the current project proposal, are thermally induced chromium depletion modeling and experimental validation in Alloys 600 and 690, modeling and validation of micro structural evolution in ferritic and austenitic steels, and nickel base alloys, and its relation to creep and fracture toughness properties in these alloys. His overall mission is to provide, by modelling, a better understanding of micro structural changes occurring in high alloy steels and nickel based alloys in irradiation and high temperature environments. This mission is supported by a strong experimental expertise in high resolution microscopy techniques, most of which are available in the Loughborough Materials Characterisation Centre. He is Past-President of the East Midlands Metallurgical Society, Chairman of the IOM3 Publications Committee, and past Chairman of the IOM3 Younger Members Committee. He is also Past-Chairman of the Midlands Microanalysis Group.



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    Abstract

    R G Faulkner
    Loughborough University, UK

    Substantial research has been done in recent decades to improve on the basic first choice materials for modern power plant for the production of electricity. Two basic technologies will be reviewed: fossil fuel fired plant; and nuclear plant. For fossil fired plant the most extreme conditions are to be found in the super heaters and top-end boilers. Materials for this application require high temperature (6500C) strength, oxidation resistance, good thermal conductivity, and low thermal expansion. High alloy ferritic steels with 9-12% Cr are used with grade names such as P91 and P92, HT9, or 1.4914. Development has centred on providing better high temperature strength. This has demanded the use of strong carbide forming elements such as Nb and V, and solution strengthening elements such as Mo and W, but higher carbon is avoided because of weldability issues. High nitrogen combines with strong carbide formers to form Z phase, which, along with sigma phase, limits the stress rupture life. This situation can be improved by redistributing the Z phase or other very stable phases such as HfC, in very fine particulate form, producing very high creep life materials. Advanced heat treatments can also improve creep strength in the ferritic steels. Higher temperatures than 6500C are now being considered, and nickel based alloys, such as IN 618 and 740 are the only materials which will offer the combination of high temperature strength and corrosion resistance required. Nuclear plant that have undergone the most extensive materials research in recent times are: 1) the light water fission reactors; and 2) fusion tokamak systems. The light water reactors consist of Zircaloy-clad uranium or plutonium fuel in high pressure water that is contained within a mild steel pressure vessel. These materials have generally performed well in the light water reactors, although there have been some concerns to limit the phosphorus levels in the pressure vessel steels to below 0.001% to prevent embrittling radiation-induced grain boundary phosphorus segregation. Copper precipitation during irradiation at operating temperatures of 3000C has also caused some embrittlement problems. The steam generators have generally relied on Alloys 600 and 690 nickel based alloys. In recent years an alloy more resistant to inter granular stress corrosion cracking, Alloy 625, has been employed. Fusion reactors present perhaps the most formidable conditions for materials of any of the currently considered power plant systems. The first wall constructional material in the test reactor ITER (International Thermonuclear Experimental Reactor) will eventually be a ferritic steel based on the 9% Cr composition of 1.4914 or P92. One materials development that has accompanied the development of ITER is the production of the worlds first reduced activation steel, Eurofer97, which has the long half-life radioactive elements, Co, Ni, Nb and Mo removed. Another development is a novel heat treatment for this steel which reduces the DBTT to acceptably low temperatures (≤ -200C).

    Time:

    Title: A Highly Efficient and Durable Electrocatalyst based on N-incorporated into Mesoporous NiO Functionalized Melamine for Glycerol and Methanol Electrooxidation

    Khalil Abdelrazek Khalil
    University of Sharjah, UAE

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    Biography

    Khalil Abdelrazek Khalil
    University of Sharjah, UAE

    Prof. Khalil is currently working as a professor and head of the Mechanical Engineering Department at the University of Sharjah. After graduating from Minia University, Faculty of Engineering, in 1990, he worked for three years in Sugar and Integrated Industries Company (SIIC) as a planning and follows up engineer. In July, 1995, he moved from SIIC to work as a demonstrator in Faculty of Energy Engineering, Aswan University, Egypt. In 1996 he completed his Master Degree. In 1998 he was accepted into the Trans-Century Training Program for Talents by the Ministry of Education of China and the Ministry of Higher Education of Egypt as a scholarship student to complete his Ph. D degree. He earned PhD in 2002. He was promoted to Assistant Professor in 2002. He got an opportunity for Postdoc fellowship in Chonbuk National University(CBNU), South Korea from 2004-2005. He was later selected through the Long-Term Foreign Faculty Program for another 2 years in the same University. In 2008, he has been appointed as Associate Professor in Faculty of Engineering, King Saud University. He has published more than 100 ISI papers of international standard with high impact factor in addition to 3 patent and two book chapters. He is also running more than five funded projects. He has promoted to the rank of full professor in both Saudi Arabia and Egypt in 2011.



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    Abstract

    Khalil Abdelrazek Khalil
    University of Sharjah, UAE

    Cost-effective and highly active electro catalysts for alcohols electro oxidation reaction are of great importance in order to widespread the commercial feasibility of fuel cell technology. However, the commercial validity of alcohols fuel cells is significantly hindered owing to the high cost of the noble metal catalysts and concurrent activity degradation. Herein, were report the design of nitrogen doped nickel oxide-porous carbon hybrid as a potential solution to this long standing issue. The embedding of conductive carbon dots into the hierarchal nano architecture is expected to play the decisive role in promoting the electro catalytic performance towards methanol and glycerol electro oxidation and enable better utilization exposed electroactive sites. As a result, the synthesized hybrid show exceptional activity for both methanol and glycerol oxidation reaction due to the synergy of Ni3+/Ni2+ active sites and carbon dots as well as nitrogen species. In addition, the hybrid reveals remarkable durability under periodic reactivation over 80,000 s which is largely attributed to the strong mutual interactions of components leading to fast electrocatalysis and unprecedented durability for methanol oxidation reaction (MOR).

    Time:

    Title: Foaming of Chitosan Generated Under Steady State Flow Condition as a Biobased Material for Bone and Tissular Regeneration

    Cedric Delattre
    University Clermont Auvergne, France

    Biography
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    Biography

    Cedric Delattre
    University Clermont Auvergne, France

    Doctor Cedric Delattre is an associate professor in Biochemistry at Institut Pascal UMR CNRS 6602, France since 2012. He built his experience in biochemistry both in international academic institution (Picardie Jules Verne University, France; Vellore Institute of Technology, India) and industrial Setting (Greentech, France). His expertise areas include chemical/synthetic biochemistry, poly- and oligosaccharides biochemistry, enzymology technologies (development of immobilized enzyme for industrial reactor), functional biomaterial including design and development of bioactive polysaccharides, biorefinery, green chemistry. He is author of 62 scientific papers in international peer-reviewed journals, 5 book chapters, 9 international patents, 41 oral presentations in international conferences, h-index 20.



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    Abstract

    Cedric Delattre
    University Clermont Auvergne, France

    Thanks to its biodegradability and biocompatibility, chitosan (CS) has great potential to be used in bone tissue engineering and drug delivery. Nevertheless, scaffolds made of CS, must be porous to be used in these biomedical applications. Pore size and interconnectivity between pores have an influence on the foam properties like mechanical strength and cell adhesion. However, when foaming occurs in batch, as the gas comes from the sky of the vessel the control of the density and the pore size distribution will be difficult. The present work aims to study the foaming ability of CS solution alone and with hydroxyapatite (Hap)/Tetraethylorthosilicate (TEOS) under steady state flow conditions. A jacketed Narrow Annular Gap Unit (NAGU) system was used for continuous foaming study. CS mixtures and gas were introduced at the bottom of the unit. Mixture flow rate was maintained at 30 ml/min. To obtain foam with different density, gas flow rate was changed from 10 to 70 mL/min. Temperature was maintained constant by the circulation of glycol solution in the jacketed unit. Foaming experiments were carried out using a CS solution and Tween 20 as foaming agent. The experiments were investigated with CS alone or in the presence of Hap and/or TEOS as source of calcium and silice respectively. The influence of operating conditions: gas/liquid flow rates, rotation speed on the density and porosity of final material were studied. The aim is to afford a sample process permitting to obtain reproducible biomaterial with a desired porosity and density for bone and tissular regeneration. Samples were collected for foams analysis (density, bubbles sizes distribution) and freeze dried for mechanical and porosity analysis (DMA, SEM). It was shown that continuous foaming process could be efficiently used to generate new biomaterial with controlled density/porosity as ceramic-like foam.

    Time:

    Title: Tailor-making materialsfor 100-nm thin inorganic solar cells

    Clas Persson
    University of Oslo, Norway

    Biography
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    Biography

    Clas Persson
    University of Oslo, Norway

    Clas Persson, graduated in materials science at Linkoping University in 1999. Postdoctor at National Renewable Energy Laboratory, USA, thereafter assistant professor 2004 at KTH Royal Institute of Technology, Stockholm. Since 2011, professor at Department of Physics, University of Oslo in Norway and at the same time, since 2007, associate professor at KTH. His research involves first-principles atomistic modeling of semiconductors for clean energy technologies, and also code development for analyzing materials. He has over 200 publications as collaborative works together with more than 250 researchers at 90 research groups world-wide, and he has supervised twenty postdoctors and research students.



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    Abstract

    Clas Persson
    University of Oslo, Norway

    Emerging Cu-based materials are explored to benefit from the energetically high-lying Cu d-state in combination with low effective mass of the minority carriers. Materials with higher functionality open for ultrathin devices and thereby less raw material usage. In this talk, we discuss the details in the optoelectronic properties of emerging Cu-based chalcogenides, like for instance Cu2(Sn,Ge)S3, Cu3Sb(S,Se)3, Cu3Bi(S,Se)3, and Cu2XSnS4 (X = transition metal atom), theoretically analyzed by employing hybrid functionals within the density functional theory. For example, we demonstrate that the band-gap energy Eg of CuSb(Se,Te)2can be optimized for high energy conversion in ultrathin photovoltaic devices, and that the alloys then exhibit excellent optical properties, especially for tellurium rich CuSb(Se1-xTex)2. This is explained by multi-valley band structure with flat energy dispersions, mainly due to the localized character of the Sb/Bi p-like conduction band states. Still the effective electron mass is reasonable small for CuSbTe2. The absorption coefficient α(ω) for CuSb(Se1-xTex)2 is at ħω = Eg + 1 eV as much as 5 to 7 times larger than α(ω) for traditional thin-film absorber materials. Auger recombination does limit the efficiency if the carrier concentration becomes too high, and this effect needs to be suppressed. However with high absorptivity, the alloys can be utilized for extremely thin inorganic solar cells with the maximum efficiency ηmax ≈ 25% even for film thicknesses d ≈ 50 to 150 nm, and the efficiency increases to ~30% if the Auger effect is diminished.The results help to understand fundamental physics of the Cu-based compounds in order to design and optimize very thin solar-energy devices.

    Time:

    Title: Dynamically Tunablevanadium Dioxide Metamaterials

    Zhijun Liu
    University of Electronic Science and Technology of China, China

    Biography
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    Biography

    Zhijun Liu
    University of Electronic Science and Technology of China, China

    Zhijun Liu, Ph.D, currently a Professor at University of Electronic Science and Technology of China. He obtained his Ph.D. from Princeton University in 2008. He then did his postdoctoral research at Brown university and University of California Los Angeles. Since 2013, he has been on faculty in the School of Optoelectronic Information at University of Electronic Science and technology of China. He was awarded National 1000 Young Talents Programof Chinaand Honorific Wallace Memorial Fellowship at Princeton University. His current interests are md-infrared and terahertz metamaterials and optoelectronics.



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    Abstract

    Zhijun Liu
    University of Electronic Science and Technology of China, China

    A large shift in the optical constants of phase-change vanadium dioxide (VO2) enables active control of its transmission and reflection properties. When incorporated as a structural element of a metamaterial, such a dynamic control opens door to properties and functionality that are otherwise unavailable in nature materials, and to tunable and reconfigurableoptical devices. In this talk, we present thermal and electrical tuning responses of two VO2-integrated metamaterials. First, we realize a tunable infrared metasurface made of a plasmonic antenna array atop a VO2 film backed with a reflecting metallic plane. By triggering the insulator-to-metal phase transition of VO2, the metasurface resonance is shifted by 3.5% in frequency, which results in a reflectivity change of 30% in magnitude. Secondly, we fabricate a VO2-integrated planar multilayer structure, which exhibits a broadband absorbance tuning. By mediating the effective impedance of the multilayered thin films with VO2 phase transition, a tuning magnitude of more than 60% is measured for absorption over the wavelength ranges of 5-9.3 micron m and 3.9-8.2 micron m.Such tuning of resonance frequency and absorbance can be deployed for reconfigurable bolometric sensing, camouflaging and modulation of infrared radiations.

    Time:

    Title: Spin-Orbital Polarons in Electron Doped Cooper Oxides

    Fedor Kusmartsev
    Loughborough University, UK

    Biography
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    Biography

    Fedor Kusmartsev
    Loughborough University, UK



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    Abstract

    Fedor Kusmartsev
    Loughborough University, UK

    Here we show that in electron doped copper oxides oxygen orbitals in CuO2 planes can be polarised with electron doping to form spin-orbital polarons. We introduce a concept of such a polaron. In these spin-orbital polarons, electrons are self trapped in one dimensional channels created by a polarisation of the oxygen orbitals forming an elongated filament. All these filaments have two possible orientation, along the main diagonals of the elementary CuO2 square. When the density of doped electrons increases many filaments are formed. they may be condense in a big filament or crossing each other perpendicularly, i.e. under right angle and therewith creating a conducting quasi-one-dimensional web. The web and the AF state are coexisting with each other at small doping. When doping increases the web of filaments is modifying the AF correlations and leads to a series of quantum phase transitions. We show that with electron doping here may arise an issue related to a polarisation of the oxygen orbitals in CuO2 plane, which can lead to a formation of new spin-orbital polarons. These polarons combine the features of the conventional electron-phonon polarons and of magnetic polarons8. They can form nanofilaments as spin bags. The multi-polarons may naturally arise in oxide materials due to the screening of the electron-elecron interaction by oxygen polarisation. Such multipolaron network provide the anomalous in-plane and out-plane magnetoresistance of electron-doped cuprate La2−xCexCuO4±δ[1]. We made a detail comparison of the developed theory with experiments and show that the spin-orbital polarons may describe these experiments very well.

    Time:

    Title: Identification of Material Parameters in Biological Soft Tissues

    Nizar Harb
    American University in Dubai, UAE

    Biography
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    Biography

    Nizar Harb
    American University in Dubai, UAE

    Dr. Nizar Harb is an assistant professor of mechanical engineering at the American University in Dubai since Fall 2015.He received his Ph.D. in Mechanics in 2013 from the University of Technology of Belfort-Montbeliard, and also a M.Sc in mechanical engineering and design in 2008. His thesis works led to developing novel numerical tools in the context of inverse identification of biomechanical parameters. In 2014, he was assistant professor of mechanical engineering at Higher Engineering School of Mechanics and Aerotechnics (ENSMA), Poitiers, France and was part of research institute Pprime (CNRS). His main field of research is non-linear solid mechanics, biomechanics, metaheuristic optimization and numerical modeling.



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    Abstract

    Nizar Harb
    American University in Dubai, UAE

    Biomechanics is interested in uncovering the link between the structure (nanoscale to milli-scale) of a biological tissue (morphology and histology) to external forces. From a mechanical stand point, properties of these tissues must be determined where an interest is given to load-bearing tissues, bones and connective soft tissues. Collagen fiber-reinforced soft tissues are known to exhibit a complex mechanical behavior that can be separated into a passive response (elastic and inelastic) and an active response (chemical factors, growth and remodeling). In this context, we discuss a behavior law (Holzapfel et al. 2002) that models the mechanical passive behavior of the arterial wall and the related parameter identification problem. It is widely accepted that the instantaneous response (elastic) of collagen fiber-reinforced soft tissues is fairly modelled by employing the hyperelastic theory. As for Long term inelastic response of the tissue, the theory of viscoelasticity gives good results. However, viscoelasticity raises the challenge as the mathematical formulation of a behavior law will lead to a highly non-linear system with many material parameters to be identified. Fung (2002) proposed the quasi-linear viscoelasticity (QLV) theory after observing that certain connective tissues exhibit a strain-rate insensitive response. QLV resides uses a multitude of classical viscoelastic elements (spring and dampers) to cover the insensitivity spectrum of the tissue. This formulation reduces the complexity of the system but leaves us with many material parameters to be identified. Hence, we propose a new parameter identification approach where the formulation of the problem accounts for the strain-rate insensitivity of soft issues. It is then solved using genetic algorithms. Consistent parameter identification results are obtained despite the non-linearity of these mechanical models.

    Time:

    Title: Substrate Effects on Silicene and How to Exploit Them

    Udo Schwingenschloegl
    King Abdullah University of Science and Technology (KAUST), Saudi Arabia

    Biography
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    Biography

    Udo Schwingenschloegl
    King Abdullah University of Science and Technology (KAUST), Saudi Arabia

    Udo Schwingenschlogl is a Professor of Materials Science & Engineering at King Abdullah University of Science and Technology (KAUST). His research interests in condensed matter physics and first-principles materials modeling focus on two-dimensional materials, interface and defect physics, correlated materials, thermoelectric materials, metal-ion batteries, nanoparticles, and quantum transport.



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    Abstract

    Udo Schwingenschloegl
    King Abdullah University of Science and Technology (KAUST), Saudi Arabia

    Silicene is the Si analogue of graphene with the same honeycomb structure and linear dispersions of the π and π* bands at the K point of the Brillouin zone. It is predicted to realize a buckled structure, due to sp2-sp3 hybridization, and is compatible with the current Si-based nano-electronics. Silicene yet has not been achieved by mechanical exfoliation but can be deposited on metallic substrates such as Ag (111), Ir (111), and ZrB2 (0001). Regrettably, strong interaction to these substrates destroys the Dirac physics. For this reason, semiconducting substrates, including Si (111) and SiC (0001), have been explored theoretically to evaluate whether they lead to a Dirac cone with reasonable band gap (which is essential for applications). However, surface passivation is inevitable for these and similar substrates, due to their dangling bonds. Layered materials such as MgBr2 (0001), MoX2, and GaX2 (X = S, Se, and Te), on the other hand, might preserve the characteristic electronic states of silicene and additionally simplify the preparation procedure as passivation is not required. The predicted effects of different substrates on silicene will be compared and evaluated with respect to technological requirements.

    Time:

    Title: Novel Electro-Crystallization of Ferricenyl Materials from Coordination-Driven Self-Assembled Ferrocenyls

    Hakikulla Shah
    Sultan Qaboos University, OMAN

    Biography
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    Biography

    Hakikulla Shah
    Sultan Qaboos University, OMAN

    Dr. Hakikulla Shahwas born in Dhule, Maharashtra, India, in 1982. He received the B.Sc. degree in Chemistry from the North Maharashtra University, Jalgaon, India, in 2004, and the M.Sc (Major: Analytical Chemistry) Chemistry from Wadia College, Pune University, India. He pursued his Ph.D. degree in Chemistry (Organometallics) from Sultan Qaboos University, Oman in 2013. During his Ph.D. he also obtained a research scholarship from British Council, UK from a British council PMI-2 Research collaboration in the Middle East grant. During his Ph.D. training Dr. Shah stayed half of every year at University of Bath, UK from 2010-2012 as a British Council visiting scholar. Currently, Dr. Shah is working at Department of Basic Science, in College of Applied Science at A Sharqiyah University, Oman



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    Abstract

    Hakikulla Shah
    Sultan Qaboos University, OMAN

    New neutral tetra-ferrocenyl-ethynylpyridinyl copper complexes have been formed by the coordination-driven self-assembly of the ferrocenylethynyl-pyridine Ligand (L) and the copper(I) halides (I-, Br- and Cl-) forming cubic L4(CuI)4, and rhomboid L4(CuBr)2, L4(CuCl)2. However, in the presence of triphenylphosphine (PPh3) under similar conditions, the reactions gave new neutral di-ferrocenyl-ethynylpyridinyl copper complexes, L2(CuI)2(PPh3)2 (5),L2(CuBr)2(PPh3)2, and L2(CuCl)2(PPh3)2. Ferrocenylethynyl functionalized pyridine ligand provided the coordination site to connect ferrocenyl units through the copper clusters. The ferrocenylethynyl-copper cluster materials oxidize under mild condition giving electro-crystallization of oxidized products. EDX analysis indicated formation of partially- and fully-oxidized products. These results were complimented by Raman analysis. SEM showed oxidation products having distinct morphologies. Some of these morphologies of the electrodeposited Cu-based microstructure are of high recent interest for fundamental studies and for potential applications in catalysis and other fields

    Time:

    Title: Finite Size Effects in a Supercooled Medium

    Taamalli Sonia
    University de Monastir, Tunisie

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    Biography

    Taamalli Sonia
    University de Monastir, Tunisie



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    Abstract

    Taamalli Sonia
    University de Monastir, Tunisie

    The properties of an amorphous material to the limits (e.g. adjacent a surface) are greatly modified by the presence of the interface. For this study we use computer simulations, molecular dynamics. This technique, widely used for the study of amorphous materials, to simulate the static and dynamic properties of these environments (Allen et al.,1989).We used modified boundary conditions and we will study various statistical quantities characterizing the material derived from the numerical results. We studied the finite size effects(Burkhard et al.,2002) on a system composed of a pho-tochromic molecular motor and a variable number of surrounding molecules Decreas-ing the size of the box has several effects, one of which is to increase the concentration of molecular motors in the medium due to periodic boundary conditions. Our simula-tions show that the diffusion coefficient D increases linearly with the concentration of chromophores when the size of the boxes decreases ,but, in contrast, D decreases and remains constant in the vicinity of the chro-mophore. Natural cooperativity of the me-dium evolves with the size of the system considered. However, we note that this coo-perativity is strongly modified by the action of molecular motors. Simultaneously, the dynamic behaviors caused by the finite size are also changed. However the structure of the medium is not changed by the system size These results show that one can increase the number of chromophore for applications in the concentrations of the study, without sa-turation effects. They also show that cooper-ative processes involved are modified by the action of the molecular motor.

    Time:

    Title: Removal of Chlorine and Chlorinated Organic Compounds from Aqueous Media Using Substrate-Anchored Zero-Valent Bimetals

    Isaac Mwangi
    Kenyatta University, Kenya

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    Biography

    Isaac Mwangi
    Kenyatta University, Kenya



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    Abstract

    Isaac Mwangi
    Kenyatta University, Kenya

    Chlorine added to drinking water as a disinfectant is a concern of this generation. This is because chlorine reacts with dissolved organic compounds to form polychlorinated complexes that are carcinogenic. Available methods for the removal of chlorine and chlorinated compounds include adsorption, precipitation, electrolysis and ozonation, but some result in the generation of more toxic compounds. This study explored the use of zero-valent bimetals Fe/Zn for the degradation of chlorinated compounds in water which did not generate toxic by-products. The zero-valent bimetallic material was anchored on a polystyrene waste material as a green method of cleaning the environment. It was prepared through nitration, amination, complexation and reduction. The resulting solid material was characterised using Fourier transform infrared (FTIR). The material was also characterised using XPS which confirmed the presence of metals anchored on the material through complexation. The metals were also found to be present upon reduction to zero valence and even after the degradation process of the chlorinated organic compounds. It was then applied for the removal process. Optimization parameters such initial halideconcentration, effect of time and bimetal dosage variation were established using synthetic water samples. It was found that the substrate-anchored ZVB material had a degradation capacity of 4.532, 5.362 and 4.513 μmol l−1 for 1,2-dichloroethane, 2-chloro-2- methylpropane and 1-chlorobutane, respectively. The material was then applied on real samples sourced from Nairobi. Quantification of chlorine was done using potentiometric methods and the results confirmed that the degradation was first order. The degradation capacities were found to be 2.37±0.01, 3.55±0.01 and 3.72±0.01 in that order.

    Time:

    Title: Khon-Sham approach to Quantum-Electrodynamical Density Functional Theory

    Muhammad Ayub Faridi
    University of the Punjab Lahore, Pakistan

    Biography
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    Biography

    Muhammad Ayub Faridi
    University of the Punjab Lahore, Pakistan



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    Abstract

    Muhammad Ayub Faridi
    University of the Punjab Lahore, Pakistan

    The density-functional theory (DFT) for quantum electrodynamics provides the significant role for Kohn Sham (KS) system. The resulting KS systems for many body methodologies were specified for different values of effective potentials that give the impression of particle to particle (Coulomb) interaction and the particle to photon interaction. Applications of these procedure and methodology to KS potentials enhanced and facilitated the calculations that were become numerically possible

    Time:

    Title: Investigating the Valence Band Structure of (Ga, Mn) As

    Intikhab Ulfat
    University of Karachi, Pakistan

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    Biography

    Intikhab Ulfat
    University of Karachi, Pakistan



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    Intikhab Ulfat
    University of Karachi, Pakistan

    The origin of ferromagnetism in dilute magnetic semiconductors remains an issue of debate [1]. Two main scenarios are discussed: acceptor induced holes in the host valence band and holes in an impurity band. Experimental evidence for the existence of an impurity band based on optical properties has been presented [2], though later studies suggest that the data are consistent with the valence band model [3]. Support for an impurity band scenario is also obtained from resonant tunneling experiments on quantum well structures [4]. Two other recent studies, one based on channeling in combination with magnetization, transport, and magneto-optical experiments [5], the other on hard X-ray photoemission [6], have come to different conclusions: the first one supporting an impurity band model in which the location of the Fermi level within the impurity band plays a crucial role in determining the Curie temperature (TC), the second emphasizing the coexistence of coupling mechanisms in the impurity band and host valence band models. It is clear that further reliable experimental work is needed to clarify the situation and provide directions for systematic procedures to find the optimally stabilized ferromagnetic state. Our recent work on Mn-doped GaAs has revealed new unexpected features, including a spin polarized energy band with strong in-plane dispersion, extending slightly above the VBM of GaAs. Very surprisingly, similar observations are made above and below the Curie temperature of (Ga,Mn)As (typically 70K for as-grown samples). Since the band structures of the para- and ferromagnetic states are predicted to be distinctly different [7], even if the exchange splitting is very small [3], this result is not compatible with the currently accepted view of (Ga,Mn)As. The combined information gathered so far indicates that there exists a ferromagnetic surface layer on (Ga,Mn)As even at room temperature.

    Sessions:
    Materials Science and Engineering & Mining, Metallurgy and Materials Science & Nano and Biomaterials

    Time:

    Title: Directional Templating of Anisotropic Nanoparticles using Poly (pyromelliticdianhydride-p-phenylene diamine)

    Wunmi Sadik
    State University of New York at Binghamton, USA

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    Biography

    Wunmi Sadik
    State University of New York at Binghamton, USA



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    Abstract

    Wunmi Sadik
    State University of New York at Binghamton, USA

    Research into anisotropic nanomaterials has significantly increased due to their potential applications in cancer cell imaging, surface enhanced Raman scattering, sensors, optical contrast agent, photochemical cancer therapy among other applications. Anisotropic nanomaterials are a class of materials whose structures, properties, and functions are direction-dependent. This presentation will focus onthe use of poly (pyromelliticdianhydride-p-phenylene diamine) (PPDD)as a reducing & stabilizing agent, immobilization matrix, and directional template for the synthesis of anisotropic silver nanoparticles (AgNPs).It will also discuss a new physical insight into the mechanisms of directional templating of anisotropic nanoparticles based on diffusion limited aggregate model and coalescence growth mechanism. Molecular dynamics (MD) simulations and density functional theory (DFT) calculations were performed to provide insight into possible conformation of PPDD monomer. Anisotropic (non-spherical) peanut-shaped, nanorods and dendritic nanostructures were prepared in situ using varying concentrations of precursors from 0.1% w/v to 1.0 % w/v within PPDD matrix. The PPDD served as the reducing and directional template, thus enforcing preferential orientation. The mechanism of formation and growth of the polymer-mediated anisotropic nanoparticles was confirmed using transmission electron microscopy (TEM), UV-vis near-infrared absorption spectra(UV-vis-NIR), and X-ray diffraction (XRD).

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    Title: 3D Hierarchical Assembled Ag Nanosheetsas SERS Platforms with Hydrophobic Condensation Effect Biomimetic Surfaces for Explosives Sensing

    Xuan He
    China Academy of Engineering Physics, China

    Biography
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    Biography

    Xuan He
    China Academy of Engineering Physics, China

    Received her B.S., and M. S. degree from School of Chemistry, Sichuan University. Then she worked as a lecturer in Institute of Chemical Materials, China Academy of Engineering Physics. Her research interests include chiral recognition, synthesis of nanomaterials and surface-enhanced Raman scattering (SERS) sensors.



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    Abstract

    Xuan He
    China Academy of Engineering Physics, China

    An efficient hydrophobic condensation strategy was presented to develop3D hierarchical Ag-nanosheet micron/nano-pillar arrays (AMA) surface-enhanced Raman scattering (SERS) spectroscopy sensors for the ultrasensitive detection of diluted water soluble organicmolecules. Highly uniform Si micro-pillar arrays which had the similar modality as cicada wings were prepared by a photolithographic technique and deep-Si etching process and then used as templates for the electrochemical deposition generation of 3D hierarchical AMA with biomimetic superhydrophobicsurface. For the first time, we reported the use of such AMA SERS platform to detect various organic pollutants (R6G, explosives picric acid, NTO, FOX-7) based on this working principle. Through a simple synthetically processing, NTO, and FOX-7 were synthesized as water-soluble salt K+(NTO)-and K+(FOX-7)-. When solution was dropped to the biomimetic superhydrophobic substrate, the greatly diluted solute was concentrated and localized into a very small region of the plane, where plasmonic electric-field hot spots were used to carry out molecule detection. So few molecules could be localized and detected even at femto-(10-15mol/L of aqueous R6G) levels without solution wasting in a short time. Contrastively, R6G was detected only at 10-12mol/L levels in ethanol. The integration of water-soluble synthesis of low-solubility molecules and the hydrophobic condensation strategy dealing with the problems for limited organic solutions of target molecules in difficulty to SERS sensing were achieved.

    Time:

    Title: Structural Behavior of Prefabricated Pad Footing System Designed Using Cold Formed Steel Lipped Channel Section

    Mahmood Tahir
    Universiti Teknologi Malaysia, Malaysia

    Biography
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    Biography

    Mahmood Tahir
    Universiti Teknologi Malaysia, Malaysia



    Abstract
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    Abstract

    Mahmood Tahir
    Universiti Teknologi Malaysia, Malaysia

    Conventional methods for constructing the pad footings required the used of plywood as formwork and reinforcement bar, thus both materials required the used of skilled workmanship in construction site. The main concern in conventional pad footing is wastage, this is because some of the materials such that plywood can no longer be used and will contribute to the additional construction cost. The purpose of this research is to investigate the structural behavior of prefabricated pad footing system using cold formed steel (CFS) lipped channel section where CFS were used as reinforcement bar and permanent formwork, by carrying out experimental tests. In addition, the experimental test results were validate with theoretical calculation and the economical aspect of CFS in pad footing system were compared with conventional pad footing throughout the steel area required. There were nine 3 full scale specimens for square pad footing with internal CFS is arranged parallel to the support have been tested. All samples are tested until failure using uniform axial compression tests. During the testing, all samples were put under increment of loads; maximum failure load, failure modes and displacement were observed and recorded. Experimental results were then compared to theoretical prediction using MSEN 1992(2010) Eurocode 2 part 1-1. The comparison shows good result between experimental and theoretical calculation. The use of CFS in ad footing seems more economic compared of using conventional methods of constructing the pad footing.

    Time:

    Title: Fabrication of Exotic Materials by Selective Laser Melting

    Prashanth Konda Gokuldoss
    Norwegian University of Science and Technology, Norway

    Biography
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    Biography

    Prashanth Konda Gokuldoss
    Norwegian University of Science and Technology, Norway

    Prashanth Konda Gokuldoss working as an Associate Professor in Additive Manufacturing at the Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, Gjovik, Norway. I have several years of research and industrial experience with nearly 70 research articles in peer scientific reviewed international journals. In addition, I have delivered 3 keynote lectures, nearly 15 invited presentations and over 25 contributed oral and poster presentations at various national and international Conferences, Symposiums and Seminars.



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    Abstract

    Prashanth Konda Gokuldoss
    Norwegian University of Science and Technology, Norway

    Selective Laser Melting (SLM) is one of the additive manufacturing processes, which can produce a three dimensional part from a pre-designed computer aided design (CAD) data layer by layer. The major advantage of the SLM process is the added functionality the parts can have apart from design flexibilities. Moreover, a near net shaped component can be produced in a single step (theoretically) and the powder particles (raw materials) can be recycled without much wastage of material and is an environmental friendly process. Extensive research has been carried out in the last decade, focusing on the development of the process parameters for different classes of materials followed by the microstructure evaluation and the testing of their mechanical properties. Some studies has also focused on the mechanisms involved in the process and the laser metal interactions. In addition, researchers have also focused on the modelling aspects of the SLM process, right from the melt pool modelling, microstructural modelling, estimation of mechanical properties etc. The present talk will focus on the different classes of materials that can by fabricated by SLM. So lights will also be shed on the considerations that are taken into account in fabrication of exotic materials.

    Time:

    Title: Three-Dimensional Nanostructures for Bio-Photonics and Neural Engineering

    Francesco De Angelis
    Istituto Italiano di Tecnologia, Italy

    Biography
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    Biography

    Francesco De Angelis
    Istituto Italiano di Tecnologia, Italy

    He is currently Senior Scientist at the Italian Institute of Technology and Supervisor of Nanostructure Facility (clean room). He leads the Plasmon technology Unit (about 25 members) and his main expertise relies on micro and nano-optical devices for biomedical applications. He currently holds an IDEAS-ERC Consolidator grant whose aim is to develop radically new interfaces between electrical/optical devices and neuronal networks. He published more than 100 papers on peer-review impacted journals



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    Abstract

    Francesco De Angelis
    Istituto Italiano di Tecnologia, Italy

    In the last years we introduced different 3D nanostructures and devices for managing the electromagnetic field at the nanoscales through the generation of surface plasmons polaritons. Firstly, we will briefly revise our past achievements concerning 3D plasmonic nanostructures and their applications to bio-sensing. Secondly, we will show our recent achievements and future perspectives of plasmonic nanopores for next generation sequencing of DNA and protein (European Project FET-Open Proseqo, GA N°687089). In the final part we will present the exploitation of 3D nano-devices in combination with CMOS arrays for intracellular recording of action potentials in mammalian neurons and intracellular delivery of biomolecules, genic materials and nanoparticles. Also, the active interaction of the cell membrane with such 3D devices will be discussed. The developed platform may enable significant advances in the investigation of the neuronal code, development of artificial retinas and low-cost in-vitro platforms devoted to the pharmacological screening of drugs for the central nervous system. As future perspective we will also discuss potential application of our system for the investigation of electrical activities of plant roots that in the near future may revolutionize plant biology. This project is supported by the European Community through the IDEAS grant program (Neuroplasmonics, GA N° 616213).

    Time:

    Title: Robust Nano-particles on Active Perovskite Electrodes for High Temperature Electrochemical Device

    Tae Ho Shin
    Korea Institute of Ceramic Engineering & Technology (KICET), South Korea

    Biography
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    Biography

    Tae Ho Shin
    Korea Institute of Ceramic Engineering & Technology (KICET), South Korea

    Dr. Tae Ho Shin (Tim. J. Shin) is an academic researcher of Energy Materials Centre at Korea Institute of Ceramic Engineering & Technology (KICET), South Korea. He received M.S. in ceramic engineering from Yonsei University and his PhD in advanced materials chemistry from Prof. Tatsumi Ishihara at Kyushu University (PhD 2012), Japan. He held a research fellow position, followed by University of St Andrews Research Fellowship (2012-2015) and worked with Prof. John T. S. Irvine. After fellowship work, he joined the faculty of Energy Materials Centre at KICET, Korea. His research involves developing new oxide electrode for the electrochemical devices such as SOFC and SOEC. An area of particular interest is crystal structure analysis for understanding and predicting the design of materials with targeted electrochemical properties. Recently, he received the Reaxys PhD Prize Finalist Award (2012), Dr. Bernard S. Baker Student Awards for Fuel Cell Research (2011, FCS&E USA), and the Electrochemical Society (USA)s Summer Fellowship Award (2011).



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    Abstract

    Tae Ho Shin
    Korea Institute of Ceramic Engineering & Technology (KICET), South Korea

    Nano-structured surfaces, such as supported nano-wires, nano-tubes, nano-rods, nano-sheets, or nano metal particles have considerable potential to solve several key challenges which catalysis and renewable energy are currently facing, provided that their morphology and hence catalytic activity can be controlled during preparation but also during operation. In particular, the use of nanoparticles in solid oxide electrochemical cells has been considered problematic because the nano-structured surface typically prepared by deposition techniques may easily coarsen and thus deactivate, especially when used in high temperature redox conditions. Recently we have shown that perovskite lattice defects in general and built-in A-site vacancies in particular, are instrumental for tailoring several aspects related to exsolution, including particle nucleation, size, distribution, stronger interaction with the parent support, and can also enable a wider range of species to be ex-solved more reliably, including for instance, Ni (1) Here we show that robust transition metal nano complex grown in situ from specifically designed nonstoichiometric perovskites or extreme nano ceria share a uniquely strong interaction with the parent support and form a well-functioning solid oxide electrolysis cell cathode, with good stability even after several redox cycles. In this study, it will be therefore concluded that novel method for robust ceramic electrode with nano complex could be used as an active cathode in solid oxide electrolysis with excellent redox and coking tolerance.

    Time:

    Title: Solidification Control of High-Si Ductile Cast Irons

    Iulian Riposan
    Politehnica University of Bucharest, Romania

    Biography
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    Biography

    Iulian Riposan
    Politehnica University of Bucharest, Romania

    Professor, Materials Science and Engineering, POLITEHNICA University of Bucharest, Romania; >300 scientific papers [published in 32 countries]; 35 Papers at American Foundry Society (AFS) / Ductile Iron Society Conferences; 22 Papers at World Foundry Congresses; 16 Papers at World Conferences on Cast Irons; 35 Romanian Patents; AFS International Member; Award of Romanian Science Academy; 2012 American Foundry Society Scientific Merit Award for advancing the knowledge of the cast iron industry through extensive research and for generously sharing his knowledge and expertise with the industry;BEST PAPER AWARDS: 63rd World Foundry Congress; 106th and 107thAmerican Foundry Society Congresses.



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    Abstract

    Iulian Riposan
    Politehnica University of Bucharest, Romania

    The new generation ductile iron with up to 6.0% Si exhibits a fully ferritic matrix, which is solution strengthened by silicon. Outstanding advantages of these grades result in their strongly increasing demand, especially in the automotive industry. The strength of ferritic irons is improved or the instability of a mixed ferritic-pearlitic matrix could be replaced with more predictable and controllable ferritic grades. Because of the combination of a high strength and good elongation it is possible to decrease the wall thickness (light weight construction); the hardness and tensile strength is homogenous over the wall thickness. The machining cost is decreased. More than 4.0%Si enhances performance at elevated temperatures by stabilizing the ferritic matrix and forming a silicon-rich surface layer, which inhibits oxidation. Molybdenum additions up to 2%, to more than 3.5%Si, give superior mechanical properties at high temperatures and improved resistance to oxidation. More than 3.0%Si increases the corrosion resistance. Experiments studied the solidification pattern of three ductile iron compositions [2.5%Si; 4%Si and 4%Si-1.6%Mo], by thermal analysis technique. Wedge samples having a different cooling modulus [ASTM A367] and rapidly graphite nodularity testing samples were also produced. Despite that silicon favours chunky graphite formation, effective inoculation decreased the sensitivity to form a dark coloured porous region in the thermal centre of Si-alloyed ductile iron and limited it in Si-Mo ductile irons. Alloying with silicon reduced the carbides sensitiveness for the entire solidification cooling rate range in both un-inoculated and inoculated irons. Without inoculation a supplementary Mo addition drastically decreased the beneficial effect of Si on undercooling. It was found that inoculation is important for high-Si but particularly so for Si-Mo alloyed irons, requiring a high efficiency inoculation procedure.

    Time:

    Title: Rheological and Impact Properties of Exfoliated Graphite Nanoplatelet-filled Impact Modified Polystyrene Nanocomposites

    Anselm Ogah
    Ebonyi State University, Nigeria

    Biography
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    Biography

    Anselm Ogah
    Ebonyi State University, Nigeria

    Dr. Ogah Anselm Ogah holds a PhD in Polymer Chemistry and Technology. He is a Lecturer in the Dept. of Industrial Chemistry, Ebonyi State University, Abakaliki, Nigeria and an adjunct lecturer with Dept. of Polymer and Textile Engineering, Nnamdi Azikiwe University, Akwa, Nigeria. He was a visiting scholar to the Composite Materials and Engineering Center, Washington State University, Pullman, WA, USA. Published over sixteen peer reviewed national and international journals.



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    Abstract

    Anselm Ogah
    Ebonyi State University, Nigeria

    In this study exfoliated graphite nanoplatelets (xGnP)-filled impact modified polystyrene (IMPS) composites were prepared at 2,4, 6 and 8 wt% xGnP with and without the addition of a coupling agent and compounded using melt mixing followed by injection molding. The coupling agent utilized in this study was polystyrene-graft-maleic anhydride. The nanoparticles used were xGnP with three different sizes: xGnP5 has an average thicknes of 10 mm, and an average platelet diameter of 5 micron m, whereas xGnP15 and xGnP25 have the same thickness but average diameters are 15 and 25 micron m, respectively. Results indicate that nanocomposites with smaller xGnP diameter exhibited improved impact properties for both pristine and compatibilized composites. However, unnotched and notched impact strengths as well as fracture initiation resistance were markedly deteriorated with the incorporation of xGnP. This brittle behavior in nanoplatelet-filled IMPS is explained using melt flow index and transmission electron microscopy.

    Time:

    Title: Investigation of H2S Gas Destruction Potential Using Zr Doped Nanoparticles

    Naeem Shahzad
    National University of Sciences and Technology, Pakistan

    Biography
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    Biography

    Naeem Shahzad
    National University of Sciences and Technology, Pakistan

    Dr. Naeem Shahzad s research focused on the Environmental applications of Nanotechnology for the abatement of air pollution. He completed his PhD focusing on the destruction of H2S gas using TiO2 nanomaterials. Besides, he also validated his experimental results through theoretical modeling using Density Functional Theory (DFT) Studies. He used DFT calculations for studying different adsorption and dissociation mechanism of H2S on the surface of TiO2. He has numerous International publications in reputed journals.



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    Abstract

    Naeem Shahzad
    National University of Sciences and Technology, Pakistan

    Due to its toxicity, destruction of H2S gas has been an important topic of researchers. Many studies have been carried for investigating various techniques for the removal of this gas. One of those techniques is catalytic and photocatalytic destruction of H2S gas using various catalysts including TiO2 owing to its significant potential for degradation of various pollutants. This study investigates the destruction potential of Zr doped TiO2 for the abatement of H2S gas. The catalysts were characterized using different techniques like XRD, SEM, XRF. The catalytic experiments were performed using fixed bed catalyst system. The samples were analyzed using GC-MC technique and it was revealed that the Zr doping of TiO2 did not favour positively towards enhancing the H2S destruction potential as found in other studies.

  • Sessions:
    Materials for Energy and Environment & Materials in Industry & Discovery and Design of new materials

    Time:

    Title: ZnO in Semiconductor Industries

    Yang Xi
    Diodes Inc, USA

    Biography
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    Biography

    Yang Xi
    Diodes Inc, USA

    Dr. Yang Xi graduated from The University of Texas at Dallas in 2015 as Ph.D. in materials science and engineering. During his Ph.D. study he focused on 2D-semiconductor fabrication and devices design. Also his research covered low-k organic materials, PVDF fibers, nanomaterials and porous materials. Dr. Yang Xi is working in Diodes Inc., (NASDAQ: DIOD) for semiconductor fabrication system quality design and new devices failure analysis.



    Abstract
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    Abstract

    Yang Xi
    Diodes Inc, USA

    ZnO thin film transistors (TFTs), due tohigh electron mobility and visibletransparency,has been used as an alternative to amorphous silicon TFTs for use in flat panel displays.ZnO is also an industries fabrication friendly material because of lower deposition temperatures than polycrystalline siliconanda higher mobility than amorphous silicon. The purpose of this talk will focus on ZnO thin film fabrications in two systems: Atomic layer depositions (ALDs) and solution based fabrications. Based on my research result a detailed analyze is displayed for this two different fabrication systems. Two different applicationsbased on refreshing rate, head up devices (HUDs) and portable artificial reality (p-AR), are explained. Challenges and solutions of ZnO thin film deposition in nowadays manufacturing industries are also included in this talk.

    Time:

    Title: Prediction Of Safe Welding Conditionsto Avoid Cold Cracking Of High Strength Steel Welded Structures

    Mohamed Rashad El Hebeary
    Cairo University, Egypt

    Biography
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    Biography

    Mohamed Rashad El Hebeary
    Cairo University, Egypt

    1989- Present; Professor, 1984; Associate Professor, and 1979; Assistant Professor, Department of Mechanical Design and Production Engineering, Faculty of Engineering, Cairo University, Egypt. 1973-1979; Research Assistant and Postgraduate student, Technical University of Heavy Industries, Miskolc, Hungary and Research Institute for Ferrous Metallurgy, Budapest, Hungary. 1967-1973; Demonstrator, Mechanical Engineering Department (Production Section), Faculty of Engineering, Cairo University, Egypt. 1965-1967; Mechanical Engineer, Establishment of Production Cooperation and Small Industries, Ministry of Industry, Egypt.



    Abstract
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    Abstract

    Mohamed Rashad El Hebeary
    Cairo University, Egypt

    The current work presents a comprehensive study of the factors affecting cold cracking of welds to find out how can we produce crack-free joints. The complicated interrelations between these factors are analyzed. The Implant cracking test is developed to quantitatively study the effect of each factor on the susceptibility of steel to Heat Affected Zone (HAZ) cold cracking. Implant static fatigue limit (RSFL) can be determined experimentally for the given material and welding conditions. To avoid cold cracking in weld (HAZ), RSFL must be greater than the stresses arising in the welded joint (RS). Implant weldability tests were carried out on C-Mn and High Strength Low Alloy steels (HSLA) with a carbon equivalent (CE) ranging from 0.38 to 0.48% and 0.52 to 0.68%, respectively. Static fatigue limit is modeled as a function of base metal chemical composition including carbon equivalent, welding variables and weld metal diffusible hydrogen content. HAZ hardness is a function of base metal chemical composition and welding variables. Static fatigue limit can be modeled as a function of HAZ hardness and weld metal diffusible hydrogen. Direct determination of stresses arising in welded joints, either analytically or experimentally, is complicated and difficult to obtain accurately. Here, an indirect technique is proposed and applied. In our experiments two different types of steels: St 52-3 and 17Mn4 with thicknesses 12 mm and 20 mm are used. Rigid steel structures are designed and welded using wide scale of welding parameters and electrode coatings. For each joint type, static fatigue limit values are calculated, and sections of the welded joints are examined microscopically for cracking. For each specified joint, the crack/no crack limiting value of RSFL is taken as the critical RS value. The critical static fatigue limits for butt-, T- and cruciform joints are determined experimentally. Nomograms are constructed to predict safe welding conditions to avoid cold cracking in single and multilayer welding.

    Time:

    Title: The potential of coating layers on erosion resistance of wind turbine blades

    Nabil El Tayeb
    British University, Egypt

    Biography
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    Biography

    Nabil El Tayeb
    British University, Egypt

    Professor Nabil El-Tayeb gained his PhD from Leeds University in Leeds, UK (1986), attended his MSc at Aston University in Birmingham, UK (1982), and received his first degree BSc distinction with honor from Helwan University-Cairo (1977). He has over 170 international and National Publications: 85 Research Publications in the International journals of: Wear, Tribology International, Proc. IMechE Part J: J. Engineering Tribology, Materials Processing Technology, Materials & Design, Tribology online, Tribology Letter, International Polymer Processing, Tribology Transaction, Applied Composite Materials, Lubrication Science, Machining Science and Technology, Applied sciences, American Journal of Applied Sciences, Surface Review and Letters.



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    Abstract

    Nabil El Tayeb
    British University, Egypt

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

    Time:

    Title: Passengers Thermal Comfort in Car Cabins

    Essam E. Khalil
    Cairo University, Egypt

    Biography
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    Biography

    Essam E. Khalil
    Cairo University, Egypt



    Abstract
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    Abstract

    Essam E. Khalil
    Cairo University, Egypt

    Cabin thermal comfort is predominantly impacted by the interior car cabin temperature. This study aims to investigate the impact of orientation of air vents on the private car cabin temperature when cooling is started. In contrast, the cabin temperature depends on the size of the cabin, the number and shape of the air vents and the collective flow of the entire HVAC system and the interior materials of the dashboard, trims and seats. In this study numerically investigated thermal comfort in a car cabin resulting of the solar radiation. Normally, the air vents in the car cabin is manually adjustable to adjust the airflow direction. Computationalfluid dynamics (CFD) investigation was performed by using FLUENT 18.0 as a solver and a CFD processor developed by ANSYS Inc., in which the solar load model is embedded. A three -dimension (3D) computational model for the car cabin has been conducted with ICEM CFD software for good quality grid generation; more than 5,000,000 grid nodes. The performance of HVAC system is characterized by air flow patterns, temperature, relative humidity contours as well as the most commonly used comfort parameters the predicted mean vote (PMV) and the predicted percentage of dissatisfied (PPD) based on Fanger model. With the help of CFD simulations it is shown that oriented air ventswith 30°provide a better thermal comfort for passengers. The study showing that the calculated temperature near the driver increased by about1.5°C resulting of the solar radiation. The study showing that the impact of inlet air temperature from vents has better effect on thermal comfort instead using higher air change per hour (ACH) at the same vent direction.

    Time:

    Title: Novel Polymeric Materials for Organic Electronics and Solar Energy

    Mohammed Al-Hashimi
    Texas A&M University, Qatar

    Biography
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    Biography

    Mohammed Al-Hashimi
    Texas A&M University, Qatar

    Dr. Al-Hashimi received his MSci Honours degree in Pharmaceutical Chemistry in 2003 and PhD in 2007 from Queen Mary University of London, UK, where he was awarded with the Donald C. Bradley, Lefevre and ASPICC Prizes. In 2007 Dr. Al-Hashimi Subsequently worked as a Senior Development Chemist at Evotec OAI/Aptuit, Oxfordshire, UK. In 2008 he joined Imperial College London, UK as a postdoctoral research assistant in the chemistry department. In 2011 he joined Texas A&M University at Qatar as a researcher and in 2012 he joined Qatar University as an Assistant Professor. In July 2013 he moved back to Texas A&M University at Qatar. Currently he is a Research Assistant Professor and his research group focus on the design and synthesis of organic semiconductor materials for a range of optoelectronic applications. His other interests center on the development of well-defined novel polymeric materials for catalysis. He has significant project management experience both in industrial and academic settings. Within the industrial setting he has direct experience in working within both longer term corporate research and customer focused business units. In academia he has managed grants in the United Kingdom and currently leads a team of 5 PDRA and 4 undergraduate students, and has attracted over $8 million in funding since he started his academic career in 2012.



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    Abstract

    Mohammed Al-Hashimi
    Texas A&M University, Qatar

    Plastic electronics has made great commercial and scientific progress over the past decade, predominantly driven by the potential of applications such as organic field effect transistors (OFETs) for flexible backplanes and e-paper, organic light emitting diodes (OLEDs) for large area lighting and displays and organic solar cells (OPV) for large area energy generation.1,2 Much of this work has been motivated by the fact that organic semiconductors can combine the superb mechanical and processing characteristics of plastics with a variety of printing techniques, enabling large-area, low-cost manufacturing. There has been an intensive worldwide research effort on the development of stable, conjugated organic semiconducting polymers as potential replacements for conventional silicon, the benchmark large area amorphous semiconductor. ID TechEx, the UK-based market research company, estimates that over the last two decades global investments into plastic electronics technologies exceed US $10 billion, and predict that this will grow to almost US $25 billion by 2020

    Time:

    Title: Sensing Human Pulse-Rate Using Ionic Polymer Metal Composite (IPMC)

    Debabrata Chatterjee
    University of Burdwan, India

    Biography
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    Biography

    Debabrata Chatterjee
    University of Burdwan, India

    Dr. Debabrata Chatterjee is former Head of the Chemistry and Biomimetics Group of CSIR-Central Mechanical Engineering Research Institute at Durgapur, India. He is now engaged as Research Advisor in the Vice-Chancellors Group at the University of Burdwan, Burdwan, India. His present research interests lie in the development of bio-inspired devices using electro-active polymers. He is an elected fellow of National Academy of Science, India (FNASc) and Fellow of the Royal Society of Chemistry, UK (FRSC). Childhood polio has left him physically challenged with a considerable mobility problem.



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    Abstract

    Debabrata Chatterjee
    University of Burdwan, India

    Development of smart material using ionic polymer-metal composites (IPMCs) is a demanding area of research [1-2]. The IPMCs are now recognized to have potential applications in developing bio-mimetic sensors, actuators, transducers, and artificial muscles. The IPMCs offer several advantages such as bio-compatibility, low power consumption and miniaturization. We have been engaged in developing IPMC based actuators and sensors [3,4]. Recently we have reported results of the actuation and sensing studies of a five-fingered miniaturized robotic hand fabricated by using IPMC [4]. Very recently, we have explored the possibility of using Nafion based IPMC for sensing the rhythm of human pulse and hear rate. In this talk the concept of a novel pulse rate sensing device is introduced exhibiting the proof-of-principle of the mechano-electrical functions of the device, namely IPMC film prepared by surface platinization of the ionic-polymer film.

    Time:

    Title: Agricultural Waste Fiber High-Density Polyethylene Bio-composites Towards Sustainability and Advanced Utilization

    Anselm Ogah
    Ebonyi State University, Nigeria

    Biography
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    Biography

    Anselm Ogah
    Ebonyi State University, Nigeria

    Dr. Ogah Anselm Ogah holds a PhD in Polymer Chemistry and Technology. He is a Lecturer in the Dept. of Industrial Chemistry, Ebonyi State University, Abakaliki, Nigeria and an adjunct lecturer with Dept. of Polymer and Textile Engineering, Nnamdi Azikiwe University, Akwa, Nigeria. He was a visiting scholar to the Composite Materials and Engineering Center, Washington State University, Pullman, WA, USA. Published over sixteen peer reviewed national and international journals.



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    Abstract

    Anselm Ogah
    Ebonyi State University, Nigeria

    The agricultural waste fibers are of notable economic and cultural importance all over the world are used for building materials, as a decorative product and as a versatile raw material. Agricultural waste fibers have significant potential in composite due to its high strength, eco-friendly nature, low cost, availability and sustainability. The agricultural waste is one of the most important problems that must be resolved for the conservation of global environment. The potential properties of agricultural waste fibers have triggered a lot of research to use these fibers as a material to replace man-made fibers for safe and environmentally friendly products. Agricultural waste is seen as one potential source of renewable energy. Their availability is obtained from oil palm plantations and some other agricultural industries such as rice husk, rice straw, sugarcane, pineapple, banana and coconut. Agricultural waste produces large amounts of biomass that are classified as natural fibers which until now only 10% are used as alternative raw materials for several industries, such as bio-composites, automotive components, biomedical and others. Characterization and comparison of the flexural, impact, water absorption and thickness swelling properties of corncob fiber, rice hull fiber, walnut shell fiber and flax shive fiber reinforced high density polyethylene (HDPE) bio-composites was studied. The composites were compounded by extrusion processing technique and results indicated that the corncob composites showed higher diffusion coefficient of 8.57 x 10-12m2s-1 while the flax shive composites showed least diffusion coefficient of 3.14 x 10-12m2s-1compared to the rice hull and walnut shell composites. The rice hull composites showed higher values of thickness swelling of 12 %, while the flax shive composites showed the lowest value of thickness swelling of 0.5 % compared to the other composites. The flexural modulus and un-notched Izod impact strength increased with a decrease in flexural strength of the composites compared to the neat HDPE. Rice hull composites showed superior flexural strength of 22.5MPa. Flax shive composites gave superior flexural modulus of 3.0 GPa and walnut shell composites exhibited superior un-notched Izod impact strength of 52.5 J/m. The study showed that agro fiber sample load of 65 wt. % could be used in composite formulation with good result.

    Time:

    Title: Sulfamethoxazole Residues in Vegetables Irrigated with Untreated Wastewater

    Ruth Wanjau
    Kenyatta University, Kenya

    Biography
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    Biography

    Ruth Wanjau
    Kenyatta University, Kenya

    Ruth Wanjau is an Associate Professor of Chemistry Department, Kenyatta University (KU). She did her B.Ed (Sc) and M Sc (Chemistry) in KU and her Ph D in Wuhan University, China. Currently, she is the Chairman, Kiambu County Education Board, Director of Accommodation Services in KU, a mentor to youths in religious, academic and life issues and a motivational speaker. She is a wife and mother of five and a grandmother of two



    Abstract
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    Abstract

    Ruth Wanjau
    Kenyatta University, Kenya

    Untreated waste water is used for growing of vegetables in small scale urban farming. Vegetables grown or irrigated with untreated wastewater may contain high levels of antibiotics residues that are detrimental to health. Sulfamethoxazole (SMX) is an antibiotic, administered in the management of pneumocystis carinii pneumonia, pneumocystis jiroveci pneumonia, toxaplasmosis and genitourinary tract infections in HIV-AIDS patients or in cases of oral thrush infections. It is cheap and readily available over the counter even through self-prescription for management of upper respiratory tract and genitourinary tract infections. The drug is also administered to poultry and livestock as a growth promoter, prophylactic and to control microbial infections. Its presence in vegetables could induce microbial resistance and minimize drug sensitivity. The concentration of sulfamethoxazole in untreated wastewater and vegetables collected during the dry season from various sites in Ruai and Njiru from small scale urban farms along Ngong River was determined. The samples for sulfamethoxazole residues underwent solvent extraction pre-analysis and the extracts were then analyzed using high performance liquid chromatography. The untreated waste water and vegetables were found to have sulfamethoxazole residues.

    Time:

    Title: Experimental Investigation And Optimization Of Laser Machining Process Parameters For Solar Cell Cutting Based On Taguchi Method

    Benson kilonzo
    Dedan Kimathi university of technology, Kenya

    Biography
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    Biography

    Benson kilonzo
    Dedan Kimathi university of technology, Kenya



    Abstract
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    Abstract

    Benson kilonzo
    Dedan Kimathi university of technology, Kenya

    In recent times, laser material processing has become a mainstream manufacturing technique in micromachining applications. This trend has been due to the various unique properties of the laser beam. Laser machining has desirable properties like flexibility and the ability to focus the beam to a small point makes it to be embraced leading to high energy density which allows cutting, welding, and drilling almost any material including silicon. In solar cell cutting of solar cell, the input parameters dictate the various output parameters after cutting. This process when it comes to customized solar panels faces challenges because not any input parameter combination produces the optimal output parameters for best quality solar cells. Therefore there is the need for optimization of the input parameters so as to produce quality solar panels. In this research, the effect of laser beam and process variables (inputs) on cut quality attributes of solar cell was investigated. The input parameters selected for this study were: laser power, scan speed, and spot diameter. The quality attributes (outputs) which were investigated were: kerf depth, kerf width, and material removal rate for the process. The input parameters were used in the design of experiment by Taguchi 9-orthogonal array implemented in Minitab17 software. The design provided nine experiments for unique combinations of the input parameters. Experiments were then conducted and the results were tabulated and analyzed. The input factors were found to have a significant effect on the quality attributes of the solar cell. The kerf depth was found to increase with increasing laser power and decreased with increasing spot diameter and scan speed. The kerf width was found to increase with increasing laser power and spot diameter while it decreased with increasing scan speed. On the other hand, material removal rate was found to increase with increasing laser power and spot diameter while scan speed had the opposite effect. From this analysis, models relating the responses to the input factors were developed with the aid of the software. Optimization process provided the solution for the desirable set values for the responses i.e. kerf depth was set at a target value of 0.1840mm, the kerf width was set to be minimal as possible, and the material removal rate was set to be at maximum as possible to reduce machining time. The optimal conditions were found to be; laser power at 126.67W, spot diameter at 0.4158mm and the scan speed at 3121mm/min. An experimental validation of the optimized conditions was conducted obtaining kerf depth at 0.1839mm with a standard deviation of 0.00001, kerf width at 0.5828mm with a standard deviation of 0.0005 and material removal rate at 1456mm3/min with a standard deviation of 1.76. These experimental results showed conformity to the optimal conditions obtained using the software. In conclusion, the study showed that the input parameters selected have a significant effect on the selected output parameters for the laser cutting process of solar cells. The study also showed that there exists a suitable combination of the input parameters in values which provide optimal output parameters.

  • Sessions:
    Synthesis & Architecture of Materials & Nanotechnology in Materials Science & Discovery and Design of new Materials

    Time:

    Title: Functional Materials From Gas Sensors To Programmable Optical Components

    Mounir Gaidi
    University of Sharjah, UAE

    Biography
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    Biography

    Mounir Gaidi
    University of Sharjah, UAE

    MounirGaidi, Doctor in physics (Ph.D Material Sciences from the national Institute of polytechnic of Grenoble-France)), now he is an Associate professor of physics at Sharjah University. He worked for many research institutes such as National center of Scientific Research (France), National Institute of scientific Research (Canada) and the Research and technology center of energy (Tunisia). Currently Dr. MounirGaidis researches focus on Nanomaterials for photovoltaic solar cells applications, Doped and un-doped metal oxide Gas sensors, Nanomaterials for photocatalysis and Multiferroic materials for opto-electronic application. He is also expert in Thin films elaboration by physical (PLD-sputtering), chemical process, electrochemical and pyrosol techniques. DrMounir co-authored more than 60 papers and books in the field of nano and smart materials applications.



    Abstract
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    Abstract

    Mounir Gaidi
    University of Sharjah, UAE

    The recent development of synthesis techniques has enabled the development of new materials and complex systems for which properties and functions are adjustable over several size scales, ranging from nanometers to centimeters. Functional materials, called smart, have taken now days an important place among the most studied research topics. Various applications have emerged as a result of this progress. As an example, we will discuss the following two cases: Conductive gas sensor: SnO2 as example During the last years and following the increase in problems related to air pollution, the work of basic and applied research in the field of gas detection, particularly the detection of pollutants, have become more and more important. Progress in the field of developing and shaping solid materials and the new possibilities offered by micro and nano-technology have contributed to the research and development of new devices for the detection of polluting gases in the air and in particular, reducing gases such as carbon monoxide, methane, H2S ... etc.Many devices operate then by using electrical conductivity variation of apolycrystalline semiconductor oxide as a result of gas-surface interactionon the grain boundaries. Despite a very large number of studies on the effect of NP metal doping on the sensing properties of SnO2, the role of these additions has so far remained largely unknown. This ignorance has been an impediment to the development of sensitive and reliable sensors. We try to propose and present the different mechanisms used to explain the role of these metal additions on the electrical properties of SnO2, and its response in the presence of a reducing gas. Inedited experiments using in-situ and simultaneous X-ray absorption spectroscopy and electrical conductivity and CO gases measurement present the main achievement of this work. Programmable Optical Components The need for next-generation photonic systems has led to the adoption of the technique known as multiplexing or "dense wavelength division multiplexing" to increase the capacity of existing optical networks. This approach requires the development of new concepts of components to ensure multiplexing, demultiplexing, switching, routing and control of each wavelength of the optical signal. This creates considerable pressure on photonic components currently used for optical signal processing. The trend will shift significantly to miniaturized optical devices with low power consumption and low cost, which not only provide superior performance than the current cumbersome devices, but also replace the functions of microelectronics. Photonic components such as networks waveguide / fiber embedded in anelectronically controllable geometry could form the basis of the new generation of "Programmable photonic components".

    Time:

    Title: Synthesis of a Hierarchical Tri-Modal Porous Silica

    Mohamad Hassan Amin
    RMIT University, Australia

    Biography
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    Biography

    Mohamad Hassan Amin
    RMIT University, Australia

    Mohamad Hassan Amin Worked as a Chemist in Pejouheshyar Company, Tehran, Iranduring Jan 1999 to Sep 2005, After that, he worked as a Lecturer and Assistance Professor/Head of Chemistry Department/Director of Research Department in Azad University, Yazd, Iran from Sep 2000 to Sep 2006, Later he moved to Material and Energy Research Centre, Tehran Iran as a Lecturer and Assistance Professor/Head of the Ceramics Department From Sep 2006 to Jan 2009. At present, he is a Research Scientist in Centre for Advanced Materials & Industrial Chemistry at School of Applied Science, RMIT University, Sydney, Australia.



    Abstract
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    Abstract

    Mohamad Hassan Amin
    RMIT University, Australia

    Hierarchical porous materials have received a tremendous research interest because of their potential role in overcoming mass transport limitations of single-mode porous materials in various industrial applications. This work reports the synthesis of a novel hierarchical tri-modal porous silica using 7.5 molar ratio of 1,2,4-trimethylbenzene:tri-block copolymer, EO20PO70EO20. The pore size distribution curve shows the presence of three types of pores w h g d m ~8 25 d 89  m. E m p m g h m h existence of macropores, larger ordered mesopores, and smaller ordered mesopores. This research provides new insights to develop novel tri-modal porous silica materials with versatile applications.

    Time:

    Title: A Robust Molecular Catalyst Generated In-Situ for Photo- and Electrochemical Water Oxidation; A Step Towards Artifical Photosynthesis

    Hussein Abdel Azim Youns
    Fayoum University, Egypt

    Biography
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    Biography

    Hussein Abdel Azim Youns
    Fayoum University, Egypt

    Hussein A. Younusreceived his PhD Degreein Material Science and Engineering from Wuhan University of Technology, China in 2015. Currently, next toa lecturer of physical chemistry at Fayoum University-Egypt, he is aPost-Doctoral Research Fellow, Wuhan University of Technology. His main research interestsconcernwater splitting, MOFs, MOPs, and electrochemical CO2reduction.He has published as a first author and co-author several papers in highly ranked scientific journals such as Chemical Society Review, Coordination Chemical Review, ChemSusChem, Scientific Reports, Advanced Synthesis& Catalysis, Catalysis Science& Technology, and ChemCatChem.



    Abstract
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    Abstract

    Hussein Abdel Azim Youns
    Fayoum University, Egypt

    Water splitting is the key step towards artificial photosystems for solar energy conversion and storage in the form of chemical bonding. The oxidation of water is the bottle-neck of this process that hampers its practical utility and hence efficient, robust, and also easy to make catalytic systems based on earth abundant materials are of exceptional importance. Here, we present an in-situ generated cobalt catalyst [Co(II)(TCA)2(H2O)2] (where TCA = 1-Mesityl-1,2,3-1H-triazole-4-carboxylate) that efficiently conducts photochemical water oxidation at near-neutral conditions. The catalyst showed high stability under photolytic conditions for more than 3 h of photoirradiation. During electrochemical water oxidation, the catalytic system assembled a catalyst film, which proved not to be cobalt oxide/hydroxide as normally expected, but instead and for the first time, generated a molecular cobalt complex incorporating the organic ligand bound to cobalt ions. The catalyst film exhibited low overpotential for electrocatalytic water oxidation (360 mV) and high oxygen evolution peak current density of 9 mA cm−2 and 2.7 mA cm−2 on GC and ITO electrodes at only 1.49 and 1.39 V (vs. NHE), respectively, under neutral conditions. Furthermore, DFT calculations predict a mono-nuclear oxidation mechanism and show that this Co(TCA)2.2H2O catalyst lies very close to the top of the theoretical volcano plot. Based on these computational results, a small modifications of this type of catalyst can lead to a superb easily synthesized industrial water oxidation catalyst.Our finding, exemplified on the insitu generated cobalt complex, might be applicable to other molecular systems and suggests that the formation of catalytic film in electrochemical water oxidation experiments is not always indication of the catalyst decomposition and formation of nanoparticles.

    Time:

    Title: The Role of Embedded Nanoclusters in Bcc-Iron in Hardening and Embrittlement of Reactor Pressure Vessel Steels as Revealed by Atomic Level Simulations

    Ahmed Tamer Al Motasem Al Asqalani
    Assiut University, Egypt

    Biography
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    Biography

    Ahmed Tamer Al Motasem Al Asqalani
    Assiut University, Egypt

    Dr. Ahmed received bachelor and master degree in Physics, with honor, from Assiut University, Egypt in 2000 and 2005, respectively. He continued his postgraduate studies at computational engineering at HUT, Finland 2007. He then joined HZDR, Germany pursuing his Ph.D. In 2012, he obtained doctoral degree (with magna cum laude) from Dresden University, Germany. He worked on the multiscale modeling of embrittlement of RPV steels in nuclear power plants. In 2013, he started his postdoc career at FMAM lab, South Korea. Then, he joined CMM group at KAU,Sweden to continue his work on atomistic modeling of wear/fatigue of low-alloy steels.



    Abstract
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    Abstract

    Ahmed Tamer Al Motasem Al Asqalani
    Assiut University, Egypt

    The increase of computing power in recent years has made large scale simulation with million, or even billion of atoms is possible. Computer simulations using classical interatomic potentials are an efficient tool to study and understand materials properties and to investigate processes of materials on the atomic level. In this manner length and time scales can be considered which are often hardly accessible by experiments. In the talk two different applications of atomistic simulations are considered. In the first topic the energetics and thermodynamics of the coherent copper nanoclusters in bcc-Fe are obtained using a combination of on-lattice Monte Carlo simulations and off-lattice molecular dynamics. These nanoclusters are assumed to be the main cause of hardening and embrittlement of Cu-bearing reactor pressure vessel steels since they act as obstacles to dislocation motion within the grains of the polycrystalline bcc-Fe. The second topic about the fracture of ferrite steels (structural materials for nuclear fission reactors) during neutron irradiation in which the interaction between embedded nanocluster and an edge crack in the framework of linear elastic fracture mechanics (LEFM), are investigated at nanoscale using molecular static (MS) simulations.

    Sessions:
    Poster Presentations

    Time:

    Title: A Study of Cleaning of Fouling Materials on Energy Transfer Surface in Thermal Power Engineering System

    Han Kyu Il
    Pukyong National University, Korea

    Biography
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    Biography

    Han Kyu Il
    Pukyong National University, Korea

    Dr. Kyuil Han received his B.S. Degree in Mechanical Engineering in 1977 from Seoul National University. He received his M.S. Degree in Mechanical Engineering in 1984 from Ohio State University and received a Ph.D. Degree in Mechanical Engineering in 1989 from Colorado State University. Present Kyuil Han is a Professor of Mechanical System Engineering in Pukyong National University in Busan, KOREA. His research Interest field is an efficiency increment of energy transfer for heat exchanging device and thermal power engineering.



    Abstract
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    Abstract

    Han Kyu Il
    Pukyong National University, Korea

    The efficiencies of thermal power system using fossil fuel depend on heat exchangers which extract energy from the exhaust gas before it is expelled to the atmosphere. To increase heat transfer efficiency it is very important to maintain the surface of heat exchanger as clean condition. The accepted skill of cleaning of fouled surface of heat exchanger is soot blowing. A high pressure jet of air is forced through the flat surface of plate to remove the deposit of fouling. There is, however, little knowledge of the fundamental principles of how the jet behave on the surface and how the jet actually removes the deposit. Therefore, the study focuses on the measuring of cleaning area and cleaning dwell time after accumulating the simulated deposit on the flat surface. The deposit test rig was built for the study and simulated deposit material is used after measuring the physical property of the each material by shearing stress test. Much data was obtained for the analysis by the parameters change such as the different jet speed, different inner pressure and variable distance of the jet from the test rig surface. The experimental data was compared with the theoretical equation and most of the data matches well except some extreme cases.

    Time:

    Title: Development of Recycling Process for Recovery of Copper from Wasted Sludge

    Jei Pil Wang
    Pukyong National University, Korea

    Biography
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    Biography

    Jei Pil Wang
    Pukyong National University, Korea

    Based on my knowledge and experience I am now working at Department of Metallurgical Engineering in Pukyong National University as an Associate Professor. I have worked at LS-Nikko Copper Smelting company for one year as a researcher and did various projects including copper smelting, recovery of nickel from smelting dust, and refining of tellurium and selenium etc. Now I am also doing many projects related with fabrication of nanosized metallic powder, recycling process, composite material, corrosion engineering, powder metallurgy, and extractive process.



    Abstract
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    Abstract

    Jei Pil Wang
    Pukyong National University, Korea

    A Recovery of copper from wasted sludge containing copper has been conducted through various processes. The sludge was analyzed by XRD (X-ray diffraction) and it was found to be amorphous phase. The specimen was oxidized in air for 24 hours to transform crystalline phases that are CuO, Cu(SO)4, Ca(SO)4, Fe3O4 and Fe2(H2O4((SO4)2O)(H2O)4. The specimen was placed into alumina crucible and it was placed in reactor. Reduction reaction was conducted by introducing hydrogen gas at 500°C for 2 hours. When reduction was done, the sample was examined by XRD and it was found to be Cu, Fe, Cu(SO)4, Fe2O3, Cu2FeS4. In the long run, copper content in the sludge was increased from 54.30 wt.% to 70.68 wt.%.

    Time:

    Title: Enhance Broaden of quantum dot emission by selective area intermixing

    Hala Alhashim
    King Abdullah University of Science & Technology (KAUST), Saudi Arabia

    Biography
    χ

    Biography

    Hala Alhashim
    King Abdullah University of Science & Technology (KAUST), Saudi Arabia



    Abstract
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    Abstract

    Hala Alhashim
    King Abdullah University of Science & Technology (KAUST), Saudi Arabia

    Semiconductor quantum-dot (QD) lasers are well known of exhibiting superior performance due to the delta-like function of the discrete density-of-states, resulting in low-threshold current densities, and high gain. Arising from the size, composition and strain distribution in and around the QD, multi-state lasing are resulting, and leading to emission broadening. For monolithic integration of photonic integrated circuits, the selective area intermixing technique is preferred. Controlling the Lasing spectra of QD lasers is highly desirable for certain application. The wide spectral bandwidth of the light source determines the coherence length which in turn determines the resolution of imaging optical coherence tomography (OCT) systems, Broad band light source are vital component for wavelength division multiplexing (WDM), and. Various methods have been proposed and utilized to achieve broad spectral bandwidth light emission from QD devices, such as using multilayer stacks of QDs with different emission wavelength for each layer, hybrid quantum well (QW)/quantum dot structures, optimizing the growth conditions to increase the inhomogeneous dot size distribution, or using multi-contact device structures. Quantum dots intermixing is a promising technique, to modify confining potential throw atoms interdiffusion, by increasing the effect of interface fluctuations between the QDs and their surrounding barrier layer materials shows as change in emission spectra. in this work, we will present the systematic post-growth thermal annealing studies using various dielectric capping TiO2, SiO2, SrTiO3, HfO2, Si3N4, ZnO, and Al2O3, to control the degree of intermixing for tuning the energy spacing between ground and exited states during the spontaneous emission process, and with the view of achieving the broadest emission. We determined the best capping and annealing process to achieve the broadest emission from each capping, followed by selecting three specific capping layer to gain the highest broadening. Our experimental results show that annealing at 650oC for 120s are the best conditions to achieve the broadest spontaneous emission spectra. The QD laser structure capped with Al2O3, HfO2 and SiO2 gave emission wavelength and full-width at half-maximum (FWHM) of 1200nm / 182nm, 1210 nm / 153 nm, and 1110nm / 116nm, respectively. By combining these three selectively dielectric capping, a broad emission with 200 nm FWHM can be achieved. Other wise even if only use Al2O3 as one capping a large emission of 182 nm can be achieved.

    Time:

    Title: Conjugated Polymers Side Chains Post-Processing for Improved Molecular Packing and Mobility of Organic Thin-Film Transistors (OTFTs)

    Maciej Barlog
    Texas A&M University, Qatar

    Biography
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    Biography

    Maciej Barlog
    Texas A&M University, Qatar

    Maciej Barlog graduated as MSc Eng in 2004 from Poznań University of Technology in Poland and moved to water treatment company for 2 years. In 2007 started my PhD at University of Glasgow under Prof Pavel Kocovsky. Main area of my research was asymmetric catalysis, singlet oxygen chemistry and Pd catalysed reactions. Straight after my viva, I moved to Texas A&M at Qatar to work with Prof Bazzi and Prof Sleeiman (McGill) doing DNA related chemistry. In 2016 I moved to Prof Al-Hashimi group with organic photovoltaics as my main area of research.



    Abstract
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    Abstract

    Maciej Barlog
    Texas A&M University, Qatar

    Soluble conjugated polymers have nowadays attracted broad academic and industrial spotlight as innovative materials of easy tuneable optical and electronic properties.1 These properties translate into various optoelectronic applications such as organic solar cells, light-emitting diodes (LEDs), and thin film transistors. The pivotal parameters that define characteristics of conjugated polymer based devices are of chemical (structure, solubility, mass) and mechanical (macroscopic) nature.2 Although the physical properties CPs is determined by designed chemical structure, critical alterations result from variations of the nanostructure of the polymer in its solid state.3 Therefore the complete optoelectronic potential of CP based device can be fully assessed only with the optimal conjugated chains alignment. We envisioned thermal and UV induced post processing of conjugated polymers predesigned to dramatically change their properties in given conditions by removal of nonconductive side chains and reducing interlayer distance.

    Time:

    Title: Adsorption and Gas-Sensing Characteristics of a Stoichiometric α-Fe2O3 (0 0 1) Nano Thin Film Forcarbon Dioxide and Carbon Monoxide With and Without Pre-Adsorbed O2

    Changmin Shi
    Linyi University, China

    Biography
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    Biography

    Changmin Shi
    Linyi University, China

    Changmin Shiwas born in May 26, 1986. He received his B.S. degree in Condensed Matter Physics (2010-2015) from ShandongUniversity. At present,he worked as a teacher in Institute of Condensed Matter Physics, School of Physics and Electric Engineering, Linyi University.



    Abstract
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    Abstract

    Changmin Shi
    Linyi University, China

    The adsorption and gas-sensing characteristics of CO2 and COmolecules onstoichiometricα-Fe2O3 (0 0 1) nano-thin film with and without pre-adsorbed O2 molecules had beenstudied using the density functional theory (DFT) method. Without pre-adsorbed O2 molecules, CO2molecule playedas an acceptor and obtains electrons from stoichiometricα-Fe2O3 (0 0 1) nano-thin film. For the O2 pre-adsorptionα-Fe2O3 (0 0 1) nano-thin film system, the CO2 molecule alsoplayedas an acceptor. However, less number of electrons was transferred toCO2 molecule ascompared to pre-adsorbed O2 molecule. Different from CO2 molecule, CO moleculealways playedas a donor forα-Fe2O3 (0 0 1) nano-thin film system with and without pre-adsorbedO2. The theoretical results verify that the CO molecule can react withlattice oradsorbed oxygen ofα-Fe2O3 (0 0 1) nano-thin film. The electrons transferred to the stoichiometricα-Fe2O3 (0 0 1) nano-thin film from CO molecule/new formed CO2 molecule were more than that of transferred to the O2 pre-adsorptionα-Fe2O3 (0 0 1) nano-thin film. For stoichiometric or O2 pre-adsorptionα-Fe2O3 (0 0 1) nano-thin film, the CO2 and CO moleculesexhibited opposite behaviors ofcharge transformation. In addition, pre-adsorbed O2 molecules displayed competitive adsorption withCO2 or CO molecule. The pre-adsorbed O2 molecules hinder electron transfer to CO2molecule fromα-Fe2O3 (0 0 1) nano-thin film or hinder electron transfer toα-Fe2O3 (0 0 1) nano-thin film from CO molecule. Theoretical results demonstrate that the(0 0 1) surface ofα-Fe2O3materials could be prepared as adsorbents or gas sensors for CO2 and CO molecules.Their structures were stable after CO2molecules were adsorbed or after the reaction of CO molecules withlattice or adsorbed oxygen ofα-Fe2O3 (0 0 1) nano-thin film.

    Time:

    Title: Robust Large-Gap Quantum Spin Hall Insulators in Chemically Decorated Arsenene films

    Dongchao Wang
    Linyi University, China

    Biography
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    Biography

    Dongchao Wang
    Linyi University, China

    Dongchao Wang gained his Ph.D from School of Physics, Shandong University. He joined the institute of condensed matter physics, school of physics and electric engineering, Linyi University in July 2016. His major is in the area of condensed matter theory, nanostructures and quantum devices. His research project is on theoretical and computational studies of structural and electronic properties of two-dimensional materials



    Abstract
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    Abstract

    Dongchao Wang
    Linyi University, China

    Based on first-principles calculations, we propose one new category of two-dimensional topological insulators (2D TIs) in chemically functionalized (-CH3, -OH and halogens) arsenene films. The results show that the surface decorated arsenene films are intrinsic 2D TIs, which are verified by calculating the edge states with obvious linear cross inside bulk energy gap. The bulk energy gaps range from 0.184 eV for AsCH3 film to 0.304 eV for AsOH films, which make them suitable to realize quantum spin Hall effect in an experimentally accessible temperature regime. These novel 2D TIs are potential candidate in future electronic devices with ultralow dissipation.

    Time:

    Title: Quantum Phase Transitions in Sn Bilayer Based Interfacial Systems by An External Strain

    Li Chen
    Linyi University, China

    Biography
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    Biography

    Li Chen
    Linyi University, China

    Li Chen gained herPh.D from School of Physics,ShandongUniversity. She worked in Institute of Condensed Matter Physics,School of Physics and Electric Engineering, LinyiUniversity. Her major is in the area of condensed matter theory, quantum Hall effect, nanostructures and quantum devices. Her research project is on theoretical and computational studies of structural and electronic properties of electronic materials.



    Abstract
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    Abstract

    Li Chen
    Linyi University, China

    Using first-principle calculations, we report for the first time, the changes in electronic structures of asingle bilayer Sn stacked on a single bilayer Sb(Bi) and on a single quintuple layer Sb2Te3 induced byboth interface polarization and strain. With BL, Bi, and QL Sb2Te3 substrates, the stanene tends to have alow-buckled configuration, whereas with BL Sb substrate, the stanene prefers to form high-buckled configurations. For strained Sn/Sb(Bi) system, we find that the Dirac cone state is not present in theband gap, whereas in strained Sn/Sb2Te3 system, spin-polarized Dirac cone can be introduced into theband gap. We discuss why tensile strain can result in the Dirac cone emerging at the K point based on atight-binding lattice model. This theoretical study implies the feasibility of realizing quantum phasetransitions for Sn thin films on suitable substrates. Our findings provide an effective manner inmanipulating electronic structures and topological states in interfacial systems by using interfacepolarization and strain, which opens a new route for realizing atomically thin spintronic devices

    Time:

    Title: Research of Carbon Nanotubes/Nafion Transparent Conductive Films

    Tianjiao Qi
    China Academy of Engineering Physics, China

    Biography
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    Biography

    Tianjiao Qi
    China Academy of Engineering Physics, China

    Tianjiao Qi received her B.S. degree in Applied Chemistry (2003-2007) from Chengdu University of technology. She received her M.S. degree in Applied Chemistry (2007-2010) from Graduate School of China Academy of Engineering Physics. At present she worked as a researcher in Institute of Chemical Materials, China Academy of Engineering.



    Abstract
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    Abstract

    Tianjiao Qi
    China Academy of Engineering Physics, China

    Transparent conductive films (TCFs) is high transparency in visible light(λ=380~780nm)with nearly metallic conductivity. They are important materials in functional films because of good conductivity and optical transmittance. In this study, we incorporated Nafion® into the coating layer of carbon nanotubes (CNTs) to improve the transparent conductive films. The transparency and electrical conductivity properties of the CNTs/Nafion® thin films were significantly improved by the 3,4-ethylenedioxythiophene (EDOT) incorporation. Carbon nanotubes/Nafion® (CNTs/Nafion®) composites are prepared based on filtration technology. CNTs are dispersed in mixed with different amounts of Nafion® and then driven by ultrasonic. From these mixtures CNTs/Nafion® composites were dipped in EDOT. The dispersion of CNTs/Nafion® is characterized by infrared spectroscopy, scanning electron microscopy and UV–vis spectra. Using the developed process, CNTs/Nafion® thin films that are uniform and the dispersion of CNTs with Nafion® connected with one another to form an interweaving films and highly transparent have been fabricated. The resistivity and optical transmittance of CNTs/Nafion® with EDOT thin film were 82 KΩ/□ and over 69% with optimum condition when the volume of CNTs/Nafion® was 0.3mL and the ratio of Nafion® was 2.5%. With the optimization of the composition of Nafion® composite, CNTs/ Nafion® thin films might potentially offer better or comparable performances as the conductive oxides.

    Time:

    Title: Stress Shift in Metallic Thin Films during Processing

    Youngman Kim
    Chonnam National University Gwangju, Korea

    Biography
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    Biography

    Youngman Kim
    Chonnam National University Gwangju, Korea



    Abstract
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    Abstract

    Youngman Kim
    Chonnam National University Gwangju, Korea

    When an average stress in growing metallic thin film was measured as a function of the film thickness during real time deposition, a reversible stress shift to the tensile side was observed for Al, Cr, and Cu thin films due to an abrupt interruption of deposition. This study comprised the effects of metal mobility and final grain size on the magnitude of the stress shift caused by an abrupt interruption of thin film deposition. The reversible shift was observed only for the interruptions at the compressive stress state. For Al the total amount of stress shift increased as the magnitude of compressive stress at the point of interruption increased. The amount of stress shift increased as the grain size of film before the deposition interruption was larger for Cu.

    Time:

    Title: Hydrothermal Synthesis, Crystal Structures, and Enantioselective Adsorption Property of Bis(L- histidinato)nickel(II) Monohydrate

    Christian Paul Ramos
    Quirino Streets University of the Philippines, Philippines

    Biography
    χ

    Biography

    Christian Paul Ramos
    Quirino Streets University of the Philippines, Philippines



    Abstract
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    Abstract

    Christian Paul Ramos
    Quirino Streets University of the Philippines, Philippines

    Porous materials such as chiral metal-organic frameworks (MOFs) have attracted growing research interest for their application promise in material science, energy storage, asymmetric catalysis, and enantioselective separation of racemic molecules. Despite the numerous researches in MOFs, there are only few reports on biologically important amino acids, histidine in particular, on its use as bridging ligand in the construction of open-framework architectures. In this work, hydrothermal synthesis was used to prepare compounds based on transition metals and histidine. The coordination assembly of imidazole side chain of histidine with divalent nickel ions in aqueous condition yielded violet prismatic solids. Single crystal X-ray diffraction (XRD) analysis showed Ni(C6H8N3O2)2 . H2O that has a monoclinic (C2) structure with lattice parameters, a = 29.41, b = 8.268, c = 6.314 Ĺ, β = 90.01 ˚. Powder X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Circular Dichroism – Optical Rotatory Dispersion (CD-ORD), and Fourier Transform – Infrared Spectroscopy (FT-IR) are conducted to further characterize the crystals. To investigate the enantioselective property, qualitative assessment of the synthesized MOFs by adsorption study with a racemic mixture of 2-butanol and CD spectroscopy was performed.

    Time:

    Title: Magnetic Characterizations and Structural, Microstructural Of Mechanically Alloyed Fe65Si20Cr15 Powders Mixture

    Ammouchi Nesrine
    University 20 aout 1955-Skikda, Algeria

    Biography
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    Biography

    Ammouchi Nesrine
    University 20 aout 1955-Skikda, Algeria



    Abstract
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    Abstract

    Ammouchi Nesrine
    University 20 aout 1955-Skikda, Algeria

    Nanostructured Fe65Si20Cr15 (at.%) powders were prepared by mechanical alloying in a planetary ball mill. Morphological, structural and magnetic characterizations of the powders milled several times were investigated by scanning electron microscopy, X-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometer. Morphological observations have shown the existence of a broad distribution of size and shape of the powder particle. A decrease in the average particle size is observed during milling process. A mixture of substitutional bcc Fe(Si) (~ 29 nm) and bcc Cr(Si) (~ 45 nm) is obtained after 3 h of milling. On prolonged milling, all the as-milled powders exhibit non-equilibrium α-Fe(Si,Cr) solid solution with crystallite size of 19-23 nm. The variations of microstructural parameters such as crystallite size, r.m.s. microstrain, static Debye Waller parameter and dislocation density as a function of milling time show good correlations among them. Mossbauer spectra of the milled powders, recorded at room temperature, reveal the decrease of the average hyperfine field suggesting a random distribution of atoms during milling and point out the formation of the disordered bcc Fe (Si,Cr) solid solution. Magnetic measurements show the ferromagnetic behavior of the milled powders.

    Time:

    Title: Structural and Electronic Properties of CaFX (X= Cl, Br and I) Compounds in its Matlockite-Type Structure via First-Orinciples Calculations

    Meriem Harmel
    Center Universitaire d'Ain Temouchent, Algeria

    Biography
    χ

    Biography

    Meriem Harmel
    Center Universitaire d'Ain Temouchent, Algeria



    Abstract
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    Abstract

    Meriem Harmel
    Center Universitaire d'Ain Temouchent, Algeria

    We present the results of the ab initio theoretical study of the structural, electronic, optical and thermal properties for CaFX (X= Cl, Br and I) compounds in its matlockite-type structure used the full-potential linearized augmented plane-wave (FP-LAPW) [1] method as implemented in WIEN2K code [1]. We used the generalized gradient approximation (GGA) [1] based on exchange correlation energy optimization to calculate the total energy. Moreover, the modified Becke-Johnson potential (TB-mBJ) [1] was also applied to improve the electronic band structure calculations. Ground state properties such as the lattice parameters, c/a ratio, bulk modulus, pressure derivative of the bulk modulus and cohesive energy are calculated as well as the optimized internal parameters, by relaxing the atomic position in the force directions. The variations of the calculated interatomic distances and angles between different atomic bonds are discussed. The electronic band structure, density of states and charge density calculations show that these compounds are ionic insulators.

    Time:

    Title: Calculation of Electronic and Structural Properties of The Semi-Conductor MgSxSe1-x by Using The FP-LAPW Method

    Boutarfa Bariza
    Guelma University, Algeria

    Biography
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    Biography

    Boutarfa Bariza
    Guelma University, Algeria



    Abstract
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    Abstract

    Boutarfa Bariza
    Guelma University, Algeria

    The structural, electronic properties of three chalcogenide compounds MgS, MgSe in rockslat phase have been investigated by using the full-potential linearized augmented plane-wave method (FP-LAPW) within density functional theory(DFT). We employed the local density approximation (LDA) and generalized gradient approximation (GGA) for the exchange-correlation (XC) potential.The equilibrium lattice constants are in agreement with the values reported in the literature.From the study of the electronic properties, we find that these binary compounds MgS andMgSe have indirect band gaps. For ternary alloy MgSxSe1-x the study of these various properties are calculated, particularly the variation of structural and electronic parameters with concentration x. We focused our attention on the origins of bowing parameters corresponding to these physical properties. In this study, we compare these predictions to the results already obtained experimentally as well as theoretical work in this regard.

    Time:

    Title: The calculated electron distribution in the In2O3 compound validated by the electron spectroscopy AES and EELS

    Hamaida Kheira
    University Center Of Ain Temouchent, Algeria

    Biography
    χ

    Biography

    Hamaida Kheira
    University Center Of Ain Temouchent, Algeria



    Abstract
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    Abstract

    Hamaida Kheira
    University Center Of Ain Temouchent, Algeria

    The electron distribution in the valence band and on the core levels in the CTO (Conductive Transparent Oxide) In2O3 is very important to predict its applications. We adopt the calculation simulation based on the approximations GGA (Generalized Gradient Approximation) and mBJ (modified Becke Johnson) using the programWien2K to obtain the electron distribution. The valence band involves the hybridation of states s and p of chemical species indium and oxygen in the range -6eV to 0eV. The features related to these states s and p are very discriminated from other features located to low energies related to states d of indium in the range -13 eV to -11eV. The calculation results enable us to predict the interband transition. Furthermore, the electron distribution around the cation (indium) and anion (oxygen) allows us to determine the ionic character of the chemical bond in the In2o3 compound. We confirm such results owing to the characterization methods by the electron spectroscopy AES ( Auger Electron Spectroscopy) and EELS (Electron Energy Loss spectroscopy).

    Time:

    Title: Experimental analysis of low density poly ethylene effect on the mechanical properties of poly ethylene vinyl acetate for prosthetic and orthotic application

    Yenealem Yilma
    Ethiopia biotechnology institute, Ethiopia

    Biography
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    Biography

    Yenealem Yilma
    Ethiopia biotechnology institute, Ethiopia

    yenealem yilma has completed his Masters at the age of 28 years from Hawassa University.He is the Team ledear of Ethiopia biotechnology institute Material Science department biomaterial research group



    Abstract
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    Abstract

    Yenealem Yilma
    Ethiopia biotechnology institute, Ethiopia

    In this comparative study, the effect of low density poly ethylene and ethylene vinyl acetate loading ratio by melt blending with additives and without additives on mechanical properties for prosthetic and orthotic application was analyzed. To carry out this thermoplastic materials such as low density poly ethylene (LDPE), Ethylene vinyl acetate (EVA), color pigment, calcium carbonate, titanium dioxide and black carbon have been used as raw material to produce the sample in sheet form and to achieve comfortable prosthetic and orthotic application. The method used were blending, molding, testing of produced materials. Increasing the content of EVA and decreasing content of LDPE had effect on compatibility, tensile strength and elongation at break vice versa. The blended composite with additives have no significant effect on molding and without additive have significant effect on molding due to molecular mobility which leads shrinkage. The maximum tensile strength reached to 10.5Mpa and minimum tensile strength reached 2.8Mpa and the maximum elongation at break reached 469.8% and minimum elongation at break 40.2%.The other result are in between of these ranges, which have better than existing one has maximum tensile strength of 2.3Mpa and elongation at break have 265%.The mean value of maximum tear load is 74.4N/mm and minimum tear load have 38.9N/mm which have better result than existing one has 10.5N/mm. Scanning electron microscope(SEM) test result showed that specimen with more filler and less content of EVA become poor in its morphology and compatibility. Keywords: prosthetic, orthotic, ethylene vinyl acetate, low density poly ethylene

    Time:

    Title: Composition Effect on CZTS Properties Prepared by Solid State Reaction

    Amar Khelfane
    CRTSE Research Center, Algeria

    Biography
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    Biography

    Amar Khelfane
    CRTSE Research Center, Algeria

    KHELFANE Amar was born on 18/03/1979 in Bouira, Algeria. He graduated from magister in 2012, a physical option for materials and components at the USTHB University in Algiers. He worked as a physics teacher in high school for two and a half years before joining the CRTSE Research Center in Algiers in December 2014 where he worked as a researcher inBulk Semiconductors Crystal Growth team (CSM) working in photovoltaic materials of 3rd generation Cu2Zn(Ge)SnS4.



    Abstract
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    Abstract

    Amar Khelfane
    CRTSE Research Center, Algeria

    Cu2ZnSnS4 (CZTS) is one of the most promising and emerging quaternary absorber materials for thin film solar cells because of its low-cost, non-toxic constituents, ideal direct band gap and high absorption coefficient. In this work, we studied the effect of zinc excess on the crystallization of Cu2ZnSnS4 compound. For this purpose, we synthesized by solid state reaction three CZTS crystals initially with 0.2, 0.4 and 0.6 wt.% of zinc excesses. The CZTS crystals were analyzed using X-ray fluorescence (XRF) to determine chemical composition, X-ray diffraction (XRD) to examine structural properties and Raman scattering for vibrational properties. The composition ratio of [Cu]/([Zn]+[Sn]) is in the range of 0.81-097 while the [Zn]/[Sn] ratio varies from 0.97 to 1.33. The sample with 0.6 at% zinc excess, thus, can be considered optimal for reaching high efficiencies in CZTS based thin films solar cells. XRD profiles exhibit major peaks at 2θ=28.45°, 47.35° and 56.12° for the three samples. These peaks are attributed respectively to the (112), (220) and (312) kesterite planes (JCPDS N°:04-003-8920). The lattice parameters a and c calculated from XRD analysis were respectively 5.429Ĺ and 10.870Ĺ. However, ZnS and Cu4Sn7S16 secondary phases were found. Furthermore, segregation of Cu2-xS phase occurs, as can be seen in Fig.2. Raman scattering spectrum of the sample with 0.6 wt.% excess zinc depicts a weak band at 471cm-1 corresponding to the Cu2-xS phase. Even so, the kesterite phase was confirmed bythe presence of four strong bands at 247cm-1, 294cm-1, 333cm-1 and 364cm-1.

    Time:

    Title: Study of CuGaTe2 Thin Films Fabricated by Flash Evaporation

    louardi yandjah
    Univ- Souk-Ahras, Algeria

    Biography
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    Biography

    louardi yandjah
    Univ- Souk-Ahras, Algeria



    Abstract
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    Abstract

    louardi yandjah
    Univ- Souk-Ahras, Algeria

    CuGaTe2 are very promising absorber materials for thin film photovoltaic devices due to their direct band gaps, which well match with the solar spectrum and their high absorption coefficients. Thin films of about 1µm of thickness have been prepared by flash evaporation technique. The structural and optical properties of these samples were investigated. X-ray diffraction analysis revealed that the films present the chalcopyrite structure with (112) preferred orientation. Optical measurements have been carried out in the wavelength range 200-3000 nm. From the transmission measurements we have deduced an absorption coefficient and optical band gap of 4.104cm-1 and 1.21eV respectively.

    Time:

    Title: Green catalyst from natural eggshell for biodiesel production

    Kaoutar Kara
    Mohammed V University in Rabat, Morocco

    Biography
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    Biography

    Kaoutar Kara
    Mohammed V University in Rabat, Morocco

    Kaoutar KARA received the masters degree in Surface Hydrology and Water Quality from Sidi Mohamed Ben Abdellah University of Science and Technology, Fez, Morocco. She is currently a PhD student at the Laboratory of Mechanics and Industrial Processes. Chemical Sciences Research Team. Mohammed V University, Rabat, Morocco. Her research interests are in waste fish valorization, biodiesel production and green energy.



    Abstract
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    Abstract

    Kaoutar Kara
    Mohammed V University in Rabat, Morocco

    High active, reusable solid catalyst was obtained from eggshell by a simple heat treatment method. Calcined eggshell was used in the transesterification of vegetable oil with methanol to produce biodiesel. In order to explain the effect of calcination temperature, we investigated the calcination process of eggshell with thermal gravity analysis (TGA), X-ray diffraction (XRD) pattern, Fourier transform infrared spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) analysis. The yield of biodiesel was affected by reaction variables, such as methanol/oil ratio, catalyst amount and reaction time. For the following reactions, all the catalyst was prepared by calcinning eggshell at 800 °C for 2 h. the produced biodiesel was characterized by techniques such as Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy. The experimental results showed that the yield increase with increasing the methanol/oil molar ratio, and reached a maximum when the ratio was above 9 and 3% of catalyst. The method of reusing eggshell waste to prepare catalyst could recycle the waste, minimizing contaminants, reducing the cost of catalyst, and making the catalyst environmentally friendly. This high efficient and low-cost eggshell catalyst could make the process of biodiesel production economic and fully ecologically friendly.

    Time:

    Title: Study of The Structural, Electronic, Thermodynamic and Magnetic Properties of AgCr2Ga Heusler Alloys by First Principals Approachs

    Belasri Amina
    LMM, Laboratoire des Materiaux Magnetiques, Algeria

    Biography
    χ

    Biography

    Belasri Amina
    LMM, Laboratoire des Materiaux Magnetiques, Algeria



    Abstract
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    Abstract

    Belasri Amina
    LMM, Laboratoire des Materiaux Magnetiques, Algeria

    The purpose of this study is to exploit structural, electronic, magnetic and thermodynamic properties of the full Heusler Ag2CrGa compound using the method of calculation of linear Muffin-tin-orbital potential (FP-LMTO) in the L21 phase with the local approximations density (LDA), local spin density and the local spin (LSDA)density coupled(LSDA-couplé). The calculation made on the structural properties such as modulus, pressure derivatives and electronic properties have enabled us to deduce the nature of this alloy which proved a metal. While the calculated magnetic properties has enabled us to evaluate the magnetic moment of the test compound Ag2CrGa and the magnetic moments of each constituent element of the latter. The calculated thermodynamic properties are apparent change in modulus, heat capacity and the Debye temperature [from 0 to 1600 °C].

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