Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 8th International Conference and Exhibition on Materials Science and Engineering Osaka, Japan.

Day 3 :

  • Catalytic Materials

Session Introduction

Jun Ding

National University of Singapore, Singapore

Title: Ceramic structures made by additive manufacturing
Speaker
Biography:

Dr Jun Ding is Professor at Department of Materials Science & Engineering, National University of Singapore. He has been working on functional materials (particularly magnetic materials) over 25 years. His current research is focusing on additive manufacturing (3D printing) with the emphasis of advanced functional and multi-functional devices.

Abstract:

Additive manufacturing has been widely used in fabrication of structural and functional devices.  Additive manufacturing has the great potential in producing novel products with geometry and functionality which cannot be or very difficultly obtained using conventional manufacturing techniques.  Polymeric materials have been widely used in additive manufacturing because of their low melting temperatures.  Some metals have been used in additive manufacturing after the successful development of novel technologies such as selective laser melting.  High-quality ceramic structures are still challenging because of high melting temperature and brittleness.  We have paid a great attention on additive manufacturing of ceramic structures.  In our recent research, we have used extrusion free-forming in fabrication of high-quality ceramic structures including YBCO high-Tc superconductor, hard and soft magnetic ferrites and ZrO2.  In addition, digital light projection has been used in fabrication of ceramic structures.

Speaker
Biography:

As the PhD researcher in Department of Chemistry, National Central University, Taiwan, Canggih Setya Budi focuses his research interests on fabrication of nanomaterials including mesoporous materials, metal nanoparticles, bimetallic alloyed nanoparticles, nano-composites and their utilization for the energy storages and catalytic reactions. His academic and research skill are well distinguished and enabling him to publish his research in good journal and achieve academic scholarship from Taiwan government. He is actively involved as the member of High Energy Battery and Nano-catalyst Research Group which enabling him to share the current issues and ideas among the researchers. For about one and half years, he also experienced to work in Research and Development (R&D) division at Pura Barutama Ltd. Co., as the largest paper and printing company in South-East Asia.

Abstract:

Superior catalysts for the catalytic reduction of 4-nitrophenol (4-NP) based on alloyed bimetallic system of Ag-Ni nanoparticles have been successfully fabricated by facile immobilizing technique within the cage-pores of carboxylic acid –COOH functionalized mesoporous silica SBA-16 (named AgxNi1-x@S16C, where x is molar ratio), following procedure in our previous works with further modification.1,2 It was greatly acknowledged that the –COOH functional groups on mesostructure silica support play a critical role in improving the interaction with target cation and confining the crystallite growth during calcination-reduction process.3,4 Under wet impregnation in basic condition, the negatively charged density of S16C support (as confirmed by zeta potential measurement) endows effective sites to undergo ionic interaction with Ag(I)/Ni(II) cation. The successful functionalization of the organic functional group on the silica framework were well identified with detailed 13C cross polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR), 29Si MAS NMR, and Fourier transform infrared (FT-IR) spectroscopy.5 It worth noting that without stabilizing or reducing agents, the highly dispersed Ag-Ni nanoparticles immobilized in cage-pores of S16C could be achieved by calcination-reduction process under inert conditions. Further characterizations, alloying bimetallic of Ag-Ni nanoparticle has been confirmed by the powder X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray analysis and high resolution transmission electron microscopy. Interestingly, the presence of Ni in bimetallic alloy system could decrease the size of Ag-Ni NPs up to sub-3 nm, much smaller than that of only Ag NPs. As the catalyst for the reduction of 4-NP, the Ag0.4Ni0.6@S16C and Ag0.6Ni0.4@S16C perform much higher catalytic activity over monometallic counterparts. This enhanced catalytic activity might be attributed to the size, loading amount, high specific surface area, well-dispersed and unique electronic properties arising from Ag-Ni bimetallic system supported in cage-type S16C. Furthermore, their magnetic properties allowing a facile and rapid recycle technique for reuse. 

Speaker
Biography:

Amina is a PhD student working on developing new materials for use as electrolyte membrane in order to improve the electrical, mechanical and alkaline behavior toward. The concept is based on the generation of totally new polymers or copolymers offering a good compromise for industrial utilization. The final products are normally less expensive than the actual commercial ones and present pretty good compromises proving by different analysis and measurements.

Abstract:

Electrolyte membranes are very important component in fuel cells and influence significantly their performance. Polymers such as  poly(olefin)s, poly(styrene)s, poly(phenyleneoxide)s, poly(phenylene)s, and poly(aryleneether)s that have been studied for use as electrolyte membranes for fuel cells. In this work, a series of electrolyte membranes have been synthesized by copolymerization of polybenzimidazole, polystyrene and polyvinylimidazolium. Various ratios were studied in order to realize a good compromise between high conductivity, swelling ratio and water uptake. The conductivity test reveals that the percentage of each component in the copolymer influences directly the ion conductivity of the final membranes. The copolymerization of polystyrene and polyvinylimidazolium was confirmed by 1H NMR and FTIR. Compared to the commercial reference fuel cell membrane, A201 Tokuyuama; 6 of the synthesized membranes exhibit better conductivity at high temperatures and 3 at all temperatures. The best conductivity is observed for membrane PBI0.5 S1VIB5 which reaches chloride conductivity of 26.3 mScm-1 at 25°C and 73.7 mScm-1 at 100 °C; the membrane has an Ion Exchange Capacity of 2.6 mmol/g and a low activation energy of 6.62 kJ/mol; membrane PBI0.5 S2VIB5 is one of the 3 membranes with a 10.77% swelling ratio with a 6.66 kJ/mol as activation energy. All synthesized membranes show a linear Arrhenius behavior and exhibit low activation energy and mostly an in plane swelling ratio. From TGA and DSC analyses, they membranes are thermostable up to 250 °C. Morphology studies explored via TEM and AFM show a well-developed bicontinuous phase distribution of hydrophilic and hydrophobic regions that confirms facile ion transport channels.  

Speaker
Biography:

Ganesh Agawane obtained his PhD in 2015 from Chonnam National University, Gwangju, S. Korea. His PhD thesis title is Fabrication of CZTS thin film solar cells by sol-gel spin-coating and PLD method. Presently he is working as a post–doctoral researcher at Korea Photonics Technology Institute (KOPTI), Korea. His present research interest includes preparation of Er3+ doped Yb3+ sensitized fluorophosphate glasses for 1.53 um LiDAR applications.

Abstract:

Statement of the Problem: Erbium doped fiber amplifiers (EDFAs) have been studied extensively to convert the NIR radiation into the visible light. The EDFAs can be applied in numerous optical applications like; optical fiber communication, data storage, biomedical diagnostic, color display, sensor, eye-safe laser and undersea optical communication. The host glass matrix noticeably affects the emission properties of the rare earth ions and, therefore, a broad study is obligatory for the exploration of the paramount apt host matrix. Fluorophosphate (FP) provides an excellent way to obtain the best matrix for doping of rare earths. The FP matrixes endure fracture toughness effortlessly making stable solid state lasers over extensive physical qualities. These matrixes are perfect for large inhomogeneous augmentation, superior broadband and flatness due to low phonon energy. Methodology & Theoretical Orientation: In this study, we report preparation of Er3+/Yb3+ co-doped fluorophosphate (FP) glasses containing aluminium-metaphosphate by melt quenching technique. The UV-Vis-NIR absorption measurements were carried out and analyzed through Judd–Ofelt model. Various spectroscopic properties like radiative lifetime, transition probability, intensity parameters Ωλ, emission cross-sections and stimulated absorption cross-sections at 1.53 μm have been evaluated. Findings: In this study, we report preparation of Er3+/Yb3+ co-doped fluorophosphate (FP) glasses containing aluminium-metaphosphate by melt quenching technique. The UV-Vis-NIR absorption measurements were carried out and analyzed through Judd–Ofelt model. Various spectroscopic properties like radiative lifetime, transition probability, intensity parameters Ωλ, emission cross-sections and stimulated absorption cross-sections at 1.53 μm have been evaluated. The fluorescence lifetime was measured and calculated by non-exponential least square fit technique. The lifetime of the glasses first increased and then decreased with increased Yb3+ mol%. Conclusion & Significance: Near infrared absorption and absorption cross-section were increased with an increase in YbF3 content. Emission elucidations showed that the glass matrix and concentration of Er3+ and Yb3+ ions significantly impact the emission characteristics and radiative lifetimes. The longest lifetime of 12 ms proved the better host matrix and 2 mol% YbF3 is the best condition for Er co-doped glasses.

Speaker
Biography:

Osvaldo Mitsuyuki Cintho has his expertise in high energy ball milling, cryogenic highenergy ball milling and cryogenic deformation processes. For analysis of these processes products, he developed devices and techniques like cryogenic x-ray diffraction system, cryogenic samples preparation methods for TEM-Transmission Electron Microscopy, Cryogenic system for the XTMS: x-ray diffraction and thermo mechanical system on Synchrotron line.  Currently, he is researching about mechanical behavior and characterization of  metals and steels on cryogenic conditions in order to propose a deformation mechanisms and recovering processes on this condition.

Abstract:

Deformation of metals at cryogenic temperatures (CT), or at temperatures close to liquid nitrogen (LN) temperature can suppress partly the dynamic recovery during deformation, allowing a higher final density of defects in the material than on a deformation at room temperature (RT). In another way, unusual deformation mechanisms can take place on cryogenic conditions. The dynamic recovery and recrystallization has a great dependence on stacking fault energy and on annealing characteristics due the dislocations distributions are a function of this energy.  Annealing uses part of the stored energy in the material to the formation of new grains with low density of defects. In the present work pure metals with different stacking fault energy; aluminum (high), copper (medium) and silver (low); were rolled on room and cryogenic temperature and the products evaluate by tensile tests and hardness measurements just after rolling and after aging on room temperature. The results right after rolling show no great difference on tensile test curves but after aging, a very greater recovering of silver than other evaluated metals was detected. As showed on figure, both the rolled silver at room temperature and cryogenic temperature exibihit a great recovering level. In other side, the cryogenic rolling on silver promotes a higher tensile resistance and higher elongation after aging than the silver rolled at room temperature. This phenomenon can be due the unrecoverable defects at room temperature generated by deformations mechanism, which occurs at very low temperature (twinning). 

Chia-Jyi Liu

National Changhua University of Education, Changhua, Taiwan

Title: Energy-saving fabrication of Ag2Te-Te and Co1-x-yNixFey thermoelectric materials
Speaker
Biography:

Dr. Chia-Jyi Liu is currently a Distinguished Professor at National Changhua University of Education, Taiwan. He received B.Sc. from National Taiwan University in 1984. He received Ph. D. The Johns Hopkins University in 1991 under the supervision of Prof. Dwain O. Cowan who discovered the first organic metal TTF-TCNQ. He worked as a post-doctor at The Johns Hopkins University, Southern Illinois University at Carbondale (1991-1992), as a visiting scientist at Superconducting Research Laboratory, International Superconductivity Technology Center, Japan (1992-1994), as a research fellow at Victoria University of Wellington, New Zealand (1995-1996) and as a researcher at Industrial Research Limited, New Zealand (1996). His current interest is now developing novel materials for thermoelectrics.

Abstract:

Thermoelectric materials can be used to generate electricity from waste heat via the Seebeck effect. High-energy input is often required to fabricate thermoelectric materials. In this talk, we present  a green route to synthesize Ag2Te-Ag nanocomposites with the reaction taking place in one pot at room temperature without any organic substance involved. Various amounts of silver in the Ag2Te-Ag nanocomposite can be obtained depending on the reaction period of time. A possible mechanism is presented for the formaiton of Ag2Te-Ag nanocomposite. A core-shell structure at the incipient stage of Ag2Te growth can be observed. However, the reaction duriation has a significant effect on the electrical transport behavior of the nanocomposites due to presence of various amounts of Ag, which might be beneficial for enhancing the performance of thermoelectric composites.

We also present a rapid route for fabricating co-doped Co1-x-yNixFeySb3 using hydrothermal methods. Hydrothermal synthesis was carried out at 170°C for a duration of 12 h, followed by evacuated-and-encapsulated heating at 580°C for a short period of 5 h. The resulting samples are characterized using powder x-ray diffraction, density, electronic and thermal transport measurements. Due to the bipolar effects on thermopower are shifted to higher temperatures as compared with the nondoped CoSb3, the power factor of Co1-x-yNixFeySb3 is significantly enhanced in the high temperature region due to significant enhancement of the electrical conductivity and absolute value of thermopower. The thermal conductivity of Co0.76Ni0.14Fe0.10Sb3 decreases with temperature down to 1.02 Wm-1K-1 at 600 K. As a result, the largest zT of 0.68 is attained for Co0.76Ni0.14Fe0.10Sb3 at 600 K. We also analyze the lattice thermal conductivity to gain insight into the contribution of various scattering processes that suppress the heat transfer through the phonons in Co1-x-yNixFeySb3.