Day 2 :
Universidade NOVA de Lisboa, Portugal
Keynote: Driving flexible electronics by hybrid materials
Rodrigo Martins is a full time Professor and Head of Materials Science Department, Faculty of Science and Technology at New University of Lisbon. He is the Director of The Centre of Excellence in Microelectronics and Optoelectronics Processes of Institute of New Technologies; President of the European Academy of Science; Head of the Group of Materials for Electronics, Optoelectronics and Nanotechnologies of the Research Materials Center of the Institute for Nanostructures, Nano-modeling and Nanofabrication, CENIMAT/I3N; Chair of the European Committee Affairs of European Materials Research Society and the Global Leadership and Service Award Committee of the International Union of Materials Research Societies; Member of the Journal Management Committee for the Journal NPJ 2D Materials and Applications. His area of expertise is related to functional materials for electronics and energy applications. He pioneers worldwide work in the field of Transparent Electronics and is one of the Inventors of Paper Electronics.
Printable electronics and flexible electronics are the key areas of development world-wide once offer the potential to add functionality to everyday objects at very low costs that would be difficult with conventional technologies. This was pushed by the large success of organic electronics over the past few decades due to their attractive features such as low process temperatures, good mechanical flexibility, light weight and the possibility to use a wide range of substrates and being recyclable. Besides that we can prepare these devices using inexpensive solution processes over large areas. These benefits offered by printable and embedded electronics have been recognized in many sectors. Nevertheless the bottle neck here is the low electronic performances so far achieved. On the other hand, metal oxide electronic materials are quite attractive since they are reliable, able to be process at low temperature and present excellent electronic performance at 1-2D scales, providing so a large variety of different and possible applications, going from low costs to high complex systems able to compete with silicon in applications like transparent electronics, optoelectronics, magneto electronics, photonics, spintronics, thermo-electrics, piezoelectrics, power harvesting, hydrogen storage and environmental waste management. In terms of production techniques, RF magnetron sputtering has been well established and has demonstrated high performance devices, as ALD. However, these require complex equipment’s, especially if we are targeting low cost applications. In contrast, the solution process has many advantages such as large-area deposition, roll-to-roll capability and easy control of composition, atmospheric processing and low cost. In parallel, we have been observing a rapid and growing interest concerning the utilization of biological materials for a wide range of applications. One of the most representative example is cellulose, not only in the form of raw material mainly for pulp and paper production, but also in the development of advanced materials/products with tailor-made properties, especially the ones based on nanostructures, for low cost and disposable applications. In this presentation, we will review the main applications of vegetal and bacterial cellulose in electronics, either as substrate (passive) or as a real electronic material (active), taking into account the expertise as well as the major developments already done at CENIMAT|i3N in the area of paper electronics.
KAIST, South Korea
Keynote: Switching iron-based superconductivity with spin current
Jhinhwan Lee has completed his Bachelor’s degree from Seoul National University (1995). After obtaining his PhD degree from the same institution, he joined Professor J C Davis’ Laboratory at Cornell University as a Postdoctoral Associate and was appointed Research Associate in 2007. He went to Korea Advanced Institute of Science and Technology as Assistant Professor and began his life-long investigations on magnetism and unconventional superconductivity. He has received Korea Physical Society Bombee Physics award in 2004 and the Albert Nelson Marquis lifetime achievement award in 2018. His works includes bandgap engineering of nanotube published in nature; scanning probe microscope for advanced material research is published as a cover paper in Review of Scientific Instruments (2017) and switching iron-based superconductivity using spin current published in Physical Review Letters with Viewpoint (2017).
We have explored a new mechanism for switching magnetism and superconductivity in a magnetically frustrated iron-based superconductor using spin-polarized scanning tunneling microscopy (SPSTM). Our SPSTM study on single crystal Sr2VO3FeAs is made up of alternating self-assembled FeAs monolayer and Sr2VO3 bilayers shows that a spin-polarized tunneling current can switch the FeAs-layer magnetism into a non-trivial C4 (2×2) order, which cannot be achieved by thermal excitation with unpolarized current. Our tunneling spectroscopy study shows that the induced C4 (2×2) order has characteristics of plaquette antiferromagnetic order in the Fe layer and strongly suppresses superconductivity. Also, thermal agitation beyond the bulk Fe spin ordering temperature erases the C4 state. These results suggest a new possibility of switching local superconductivity by changing the symmetry of magnetic order with spin-polarized and unpolarized tunneling currents in iron-based superconductors. We have also performed high-resolution quasiparticle interference (QPI) measurements, self-consistent BCS-theory-based QPI simulations and a detailed e-ph coupling analysis to provide direct atomic-scale proofs of enhancement of iron-based superconductivity due to the BCS mechanism based on forward-scattering interfacial phonons.
- Advanced Functional Materials | Polymers Scicence and Engineering | Advanced Optical Materials | Advancement in Nanomaterials Science and Nanotechnology | Coating and Surface Engineering
Location: London B
Dieter M Gruen
Dimerond Technologies, USA
Tohoku University, Japan
private scholar, Germany
Title: Relation between internal friction and fatigue
Time : 10:20-10:40
Wolfgang Grafe has completed his Degree in Physics at the Humboldt-Universitat in Berlin (GDR) in 1962. In the following years, he worked with semiconductors and semiconductor surfaces at the Akademie der Wissenschaften in Berlin. With the results of those investigations, he also received the degree Dr. rer. nat. (PhD) at the Humboldt-Universität in 1969. From 1971, he worked in the field of mechanical properties of mineral glasses. With the results of these investigations he has completed his Dr. sc. nat. degree at the Akademie der Wissenschaften in Berlin in 1984. He was employed in a Federal Administrative Authority in Berlin from 1991 till his retirement in 2001.
The background of internal friction in solids and their fatigue may be theoretically described by a migration of unspecified items which is caused by the action of mechanical stress gradients. From the two resulting formulae a relation between the fatigue and the background of internal friction has been deduced. With this relation the statistical distribution of the fatigue data can be explained to some extent. Data published by Ravilly in 1938 demonstrates the correctness of this theoretical result. For the case that temperature gradients are the reason for the migration of the unspecified items, a formula results which is similar to the above mentioned one for the fatigue. With the statistical analysis of the data for fatigue and the total internal friction it could be possible to answer the question which physical quantity is the cause of fatigue.
Warsaw University of Technology, Poland
Title: Improvement of CFRP electrical conductivity by applying nano enabled products containing carbon nanotubes
Time : 10:40-11:00
Anna Boczkowska is an Associate Professor in the Faculty of Materials Science and Engineering at Warsaw University of Technology in Poland. She has completed her Graduation from the same faculty in 1989 and completed her PhD in 2000 and DSc in 2011. Her scientific experience is related to the processing and structure of polymer matrix composites, nano composites and smart materials and industrial background of over 15 years in the development and application of polymers and composites. She is a member of many international organizations (e.g., ACS, AAAS, and SPIE) and author of numerous scientific publications, books and patents.
Due to their low weight and high mechanical performance, carbon fiber reinforced polymer (CFRP) is used in the aerospace, automotive and defense industries. In comparison to metal parts, they can reduce total mass but cannot reduce electrostatic discharge or protect against lightning strikes. Therefore, a new challenge is to find a way to improve the electrical conductivity of CFRP, especially throughout its thickness. The most promising idea is to use carbon nano tubes (CNTs), which show not only high electrical conductivity but also good thermal conductivity and mechanical strength, while maintaining low density. There are different approaches to introducing CNTs into CFRP in manufacturing. One such approach is mixing the resin with CNT powder before performing the infusion. However, the significant increase of resin viscosity in the presence of CNTs makes the infusion process difficult. Another way is to bond CNTs covalently onto carbon fabrics. A more convenient way is to apply nano-enabled products such as thermoplastic non-woven fabrics containing CNTs (CNT-doped veils). The first manufacturing method involves the production of fibers and their thermal bonding; the second way is direct melt blowing of thermoplastic polymers doped with CNTs. Implementation of both types of non-woven fabrics in CFRP as inter layers by pre-preg and resin infusion results in good impregnation. When compared to the reference CFRP, the addition of CNTs increases the electrical volume conductivity throughout the panel thickness by as much as 350%. The obtained results are very promising for the further application of CFRP with CNTs as novel, lightweight and conductive structures for the replacement of metallic parts in many industrial sectors.
University of Limoges, France
Title: Boron carbide-based ceramics for thermostructural application: Sintering by SPS and mechanical performances
Time : 11:00-11:20
Alexandre Maître is a Professor at IRCER at Limoges in France. His thesis diploma was devoted to the Kinetic and Thermodynamic aspects of the Synthesis of Transition Metal Carbides by Carbothermal Reduction. In 2000, he has obtained a permanent position as CNRS Researcher at the Laboratory of Chemistry of Inorganic Solid at Nancy to develop investigations concerning the thermodynamic modeling, the electrochemical behavior in corrosive environment and the metallurgical aspects of lead-based alloys. Further, he became Assistant Professor in IRCER to implement research activities about the elaboration by polymer derived ceramics route and the mechanisms of sintering of high temperature ceramics. His scientific production (h index: 22) is now composed of 82 publications in international journals, 25 invited conferences, 98 oral communications, 3 chapters of books and 3 grants.
Boron carbide is a promising ceramic in the armor field and in nuclear reactors due to its low weight, its high hardness and its high capacity to absorb neutrons. These excellent properties result from unusual characteristics of B-B and B-C chemical bond. In the literature, there is a general agreement about the existence of solid solubility of carbon with the stable phase BxC and a large range extending from 8 to 20 at.% C. So, the mechanical properties of boron carbide monoliths depend on their chemical composition (i.e. carbide stoichiometry, presence of secondary phases such as free carbon) and on microstructural characteristics (i.e. porosity level, grain size). In the present work, fully-dense boron carbide monoliths exhibiting fine microstructure (i.e. submicrometric grain size) are shaped and sintered by spark plasma sintering. Two different commercial powder batches, exhibiting different stoichiometries and various amounts of secondary phases are used. Their chemical composition is well-defined by coupling different methods (TEM, XRD, IGA) and are correlated with their mechanical properties, characterized from meso- to macro-scopic scales by nano-indentation and ultrasonic pulse echography. The presence of secondary phases (graphite and boric acid) is noticed in various proportions in each powder batch. Their effect on the mechanical features of the corresponding boron carbide-based ceramics has been investigated. So, if the boric acid disappears during the sintering step, the graphite remains. However, for the considered amounts of graphite (lower than 1 wt.%), the low variation in graphite content have no significant effect on hardness and elasticity. At the opposite, the presence of oxygen in solid solution, leading to a boron oxycarbide phase, induces a decrease of both hardness and elasticity.
Tohoku University, Japan
Title: Synthesis of 2D layered semiconductor GaSe for the application of Terahertz non-destructive inspection
Time : 11:40-12:00
Yutaka Oyama has completed his BS, MS and PhD degrees in Electronics at Tohoku University, Japan. He was a Researcher with the Semiconductor Research Institute (SRI) in Japan and became a Senior Researcher with SRI. He was a Group Leader of the Nishizawa Teraherz Project of the Research Development Corporation of Japan (JRDC). He has been an Associate Professor and Professor of Materials Science and Engineering, Graduate School of Engineering, Tohoku University. He was a Visiting Researcher with IHP (Institut für Halbleiterphysik) at Frankfurt (Oder) Germany, and also EPFL (École Polytechnique Fédérale de Lausanne) at Lausanne Swiss. He is the author or co-author of over 300 international journals and conference publications on material science and its application for ultrafast semiconductor devices.
Terahertz (THz) wave has both superior characteristics of radio wave and light, in which high permeability for non-polar materials and efficient reflection from metal surface are principal features. Thus, THz wave reflected from the opaque coated metal surface can be used for nondestructive testing (NDT). In addition, specific inter molecular vibrations (finger print spectra) of soft and hard materials are appeared in THz frequency region. We have developed various THz wave generators by careful control of lattice vibrations in semi conducting GaSe crystals. THz wave has low quantum photon energy, thus it is safe for human tissues even for radiation. We have established a data base of terahertz permeability characteristics for industrial materials and successfully constructed non-destructive THz diagnosis of building blocks, polymers, insulated copper cable and hot-dip galvanized steel sheet, etc. For the efficient THz light sources, two-dimensional (2D) layered GaSe has been attracted much interest because of its superior crystallographic, optical features and even for spintronics. Layered crystals combine thin sheets by out-of-plane Vander Waals interactions. For the use of practical applications, mechanical strength needs to be improved. However, no direct experimental determination has been performed up to now for Vander Waals bonding energy. In our group, a precise tensile testing machine was constructed for the quantitative determination of the inter layer Vander Waals bonding force. In this study, low temperature liquid phase growth of GaSe and its characterization are shown with the improvement of Vander Waals bonding energy by the addition of Te and In. Then, some killer applications of THz wave for the health evaluation of infrastructures will be shown.
Cape Peninsula University of Technology, South Africa
Title: Solution deposition of Cu doped Co3O4 for electrooxidation of glucose
Time : 12:00-12:20
Mahabubur Chowdhury has received a Doctoral degree in Chemical Engineering and is currently a Senior Lecturer in the Department of Chemical Engineering at Cape Peninsula University of Technology. His research is on advanced functional materials for bio sensing and water treatment. His interest is on the relationship of electronic structure and ionic transport properties in semiconductor electrodes. He has published many journal articles, conference proceedings, book chapter and patent.
One of the major causes of death and disability in the world is due to diabetes mellitus. The frequent testing of physiological blood glucose levels to avoid grave emergencies is vital for the confirmation of effective diabetic treatment. The current glucose sensors that are being used by diabetic patients are glucose oxidase sensors. However, due to problems associated with fabrication of enzymatic glucose sensors, non-enzymatic glucose sensors have been of focus recently. In this study, a simple solution-based deposition process has been utilized to fabricate a Cu doped Co3O4 electrode for non-enzymatic glucose detection. The substitution of Cu into the Co3O4 host lattice resulted in an enhanced electrochemical performance compared to the pristine Co3O4 as was measured from the Hall Effect measurement. The sensor exhibited two distinctive linear ranges covering upto 7.6 mM at an applied potential of + 0.65 V vs. Ag/AgCl in 0.1 M NaOH solution. The sensor depicted good repeatability (RSD of <10%), stability and reproducibility (RSD of <10%). The sensitivity of the sensor was determined to be 1333 μA/cm2 mM (lower concentration range) and 141 μA/cm2 mM (upper concentration range), with a lower detection limit of 0.15 μM (S/N=3). The as prepared electrode showed a response time of <10 seconds and was very selective towards glucose in the presence of various interference species (Figure-1). The ease of fabrication, good electrochemical activity and good inter and intra electrode reproducibility makes this electrode a promising candidate for non-enzymatic glucose detection.
Title: Cu metal/Mn phthalocyanine organic sprinter faces atop Co with high spin polarization at room temperature
Time : 12:20-12:40
Wolfgang Weber has completed his PhD at RWTH Aachen, Germany during 1988-1992. He has completed his Postdoctoral studies and worked as a Senior Scientist at IBM Ruschlikon, Switzerland during 1993–2002. Since 2002, he is working as a Professor at University of Strasbourg. During 2007-2014, he was the Leader of the Department of Surfaces and Interfaces at the IPCMS. Currently, he is mainly working on the Magnetism of Thin Films and has great expertise in Spin Polarized Electron Spectroscopies.
Spin polarized charge transfer between a ferromagnetic metal and a molecule can magnetize the molecule atoms and generate an interface with a high spin polarization of electronic states at the Fermi level at room temperature. Similarly, the Mn-phthalocyanine molecule’s central paramagnetic site Mn can couple magnetically to a Co layer thanks to interlayer exchange coupling upon separating both interfacial constituents with an ultra-thin non-magnetic Cu spacer. However, the large spin polarization at the Cu/Mn-phthalocyanine sprinter face atop Co has so far only been predicted. We experimentally demonstrate this high spin polarization at room temperature through spin resolved photo emission spectroscopy measurements on the prototypical system Co (001)/Cu/Mn-phthalocyanine. Surprisingly, we find that the Cu thickness dependence of the spin polarization remains essentially constant up to 10 monolayers, which is inconsistent with the interlayer exchange coupling description of magnetic coupling between the Co layer and the molecule’s Mn site. Ab-initio calculations account for this fundamental discrepancy by showing that the top most Cu layer before Mn-phthalocyanine adsorption is already significantly spin-polarized and contributes to the formation of the Cu/Mn-phthalocyanine sprinter face atop Co. We thus find that this example of a non-magnetic metal/molecule organic sprinter face atop a ferromagnet is advantageously impervious to variations in the non-magnetic metal layer thickness as expected from an inter-layer exchange coupling description of its formation. Our results open a route toward integrating electronically fragile molecules within organic sprinter faces and electrically manipulating molecular spin chains using the well-documented spin-transfer torque properties of ferromagnetic metal/non-magnetic metal bilayers.
MTA–BME Research Group for Composite Science and Technology, Hungary
Title: Producing of aluminium matrix composite wire
Time : 12:40-13:00
Janos Dobranszky is working as a Scientific Advisor in the common research group for composite science and technology at the Hungarian Academy of Sciences and Budapest University of Technology and Economics. He is a Mechanical Engineer and International Welding Engineer. Since 2015, he is a Habilitated Doctor of the Faculty of Mechanical Engineering of BME and Doctor of the Hungarian Academy of Sciences. His main research field interests are Metal Matrix Composites, Biomaterials and Biocomposites, Weldability of Stainless Steels, Failure Analysis of Wood cutting Band Saw Blades. He is the Hungarian Delegate in the Commission VI of the International Institute of Welding.
Continuous fibre reinforced aluminium matrix composite wires were perspective materials as reinforcing core wire whether in electrical conductors or preferentially reinforced castings. Since the last years of the 2nd millennium composite cores were developed as reinforcement instead of a steel core in the high-tension electrical conductors. The much lower thermal expansion and the much higher specific strength were their advantages. Actually the leading type between these special products is the aluminium conductor composite core (ACCC) cable, in which the reinforcing is made of polymer composite tube that is filled with carbon fibre. Another type of low sag electric conductors is the ACCR cable (aluminium conductor composite reinforced), in case of that high strength steel or invar alloy core wires are replaced by aluminium matrix, alumina fibre reinforced composite wires. In the long-term practice, only two solutions were successfully applied for producing aluminium matrix composite wires. The first one is the 3M’s ultrasonic-assisted infiltration and the second one is the Blucher’s process. This last one applies continuous infiltration with gas pressure, but only the first infiltration is used on an industrial scale. The most critical step of the Blücher’s process is that, the reinforcing fibre roving is pulled across the molten aluminium containing gas-pressure system. The Blucher’s process was developed at the Metal Matrix Composite Laboratory of the Northeastern University (Boston MA, USA), but in 2005 the laboratory was transferred to Budapest University of Technology and Economics. The article describes those results, which were achieved in the new working period of the Metal Matrix Composite Laboratory.
Jawaharlal Nehru Tropical Botanic Garden and Research Institute, India
Title: Chitosan asiaticoside nanoparticles synthesized from Centella asiatica for glioma therapy
Time : 13:00-13:20
V Gayathri is a Senior Scientist at Phytochemistry and Phytopharmacology Division of Jawaharlal Nehru Tropical Botanic Garden and Research Institute, Thiruvananthapuram, Kerala, India. She has obtained her Bachelors’ and Masters’ in Biochemistry from Bharathidasan University, Tamil Nadu, India. She has obtained her PhD from Jawaharlal Nehru Tropical Botanic Garden and Research Institute (formerly Tropical Botanical Garden and Research Institute) and Rajiv Gandhi Centre for Biotechnology, Trivandrum, India. She has been engaged in various research activities as Post-Doctoral Fellow in Nano- Material Chemistry at Biomedical Technology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, India. Her field of expertise includes toxicological profiling of various materials/drugs/nanoparticles on various cell types and tissue engineering with several bio materials. She has 10 years of experience in the field of nano material chemistry and toxicology and her area of specialization is green nano chemistry. She has 20 research papers to her credit in peer reviewed journals.
Centella asiatica is a high value medicinal plant widely distributed in the tropical and sub-tropical regions. The main active principles are asiaticoside and madecassoside. Both these compounds have wide spectrum of biological activities. The plant is famous in the label of memory booster and it shows neuropharmacological activity. The brain targeted delivery of a drug is very challenging. Previous studies have shown that the penetrability of drug inside the brain is limited due to the presence of defensive mechanism of brain. Free diffusion transposition through the interstitium of the brain is restricted by complex anatomy of blood brain barrier (BBB). The poor solubility and low penetrability of a drug into the brain is the major drawback in the neuropharmacology related studies. To overcome these limitations nanovehicles were used. To enhance the permeability of a drug into the site of action was performed using nano delivery systems were developed. The brain permeability is a risk factor for a drug to exhibit therapeutic effects at a target site. The main objective of our study focuses on the development of a novel drug-based nanoparticle for the effective brain targeted delivery. Ionic gelation method was used for the encapsulation of asiaticoside into the chitosan alginate nanoparticle. Physicochemical and Biological characterization: The physical and chemical characterization study was done by Fourier transform infrared (FTIR), size distribution measurements using dynamic light scattering (DLS), surface morphology by scanning electron microscopy, internal structure by transmission electron microscopy and nature of the particle were analyzed by X-ray diffraction. The thermal characteristics were studied using thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and differential thermal analysis (DTA). Interfacing the nanoparticles with glioma cells showed significant death of the cells. The work concludes that Chitosan asiaticoside nanoparticles are potential remedy for the second level treatment of glioma.
Nataraj J R
R V College Of Engineering, India
Title: Investigation on weldability behavior of chromium-free nickel filler with stainless steel AISI-304
Time : 14:00-14:20
Nataraj J R is an Associate Professor in the Mechanical Department at R V College of Engineering, Bengaluru. He has more than 12 years of teaching and research experience and two years of industrial experience. He has completed his ME at University of Applied Sciences, Wildau, Berlin, Germany with scholarship grants from prestigious DAAD in the year 2003-05. He has completed his Doctoral degree at Kuvempu University, Karnataka, India in 2014 in the field of Cr-free welding and new materials development. He has 27 research publications and is a member of several societies such as ISSS, ISTE, ISSE, ASM, and IEI. He is also a Reviewer/Editorial Board Member for several national and international journals. His research areas are Stainless Steel Welding, New Materials Development, Composite Materials, Heat Treatment, Thin Film Sensors, Inter Metallic and Renewable Energy.
Two novel Cr-free nickel based welding filler rods were fabricated and used to weld austenitic grade stainless steel 304 (SS304) by tungsten inert gas (TIG) welding. Two welding wires designated as 3S (without Mn) and 4N (with 2% Mn) of %wt composition 43.499Ni, 25Fe, 10Mo, 10Cu, 10Co, 0-2 Mn, 1Ti, 0.5Al and 0.001C were fabricated and welded to SS304. Comparative studies of the joints welded by these two filler rods are presented. The weld joints were characterized for microstructure, mechanical and fracture properties. The microstructure of the weld interface showed presence of TiC and MoC precipitates within the grains and along the grain boundaries which is attributed for its strength of the weld joints. The Unmixed zone in the joint welded by 3S filler rod is wider than that welded with 4N filler rod. Presence of 2% Mn in 4N filler rod promotes the formation of γ' (gamma prime) precipitates and hence may be responsible for better joint strength than joints welded by 3S filler rod. Tensile tests results showed joint strength due to 4N filler rod is marginally superior (by 3.5%) to joints welded by 3S filler rod. However the ductility of the joint welded by 4N filler rod was lower by 6% compared to the joint welded by 3S filler rod. The hardness across the weld joints showed softer heat affected zone (HAZ) and hence is susceptible for failure during mechanical loading. The joint welded with 4N filler rod underwent significant amount of plastic deformation before failure. The joints welded with both the filler rods showed ductile mode of failure.
Ricardo A M Gotardo
Federal University of Paraná, Brazil
Title: Multiferroic properties and structural characterizations in Mn and Cr doped 0.9BiFeO3-0.1BaTiO3 compositions
Time : 14:20-14:40
Ricardo A M Gotardo has studied Physics and has pursued his PhD in Condensed Matter Physics at the State University of Maringa. He is a Professor at the Technological Federal University of Paraná in Cornélio Procópio since 2013. His research focuses on multiferroic materials, relating materials structure with the magnetic and electronic properties.
Bismuth ferrite (BiFeO3; BFO) is one of the most studied multiferroic materials, mainly due to its reported magnetoelectric properties at room temperature, potential use in nonvolatile memory applications and developments in the fundamentals of solid state physics. BFO ferroelectric and antiferromagnetic phase transitions are found significantly above room temperature, i.e., it is a ferroelectric material below Tc~1100 K and an anti-ferromagnetic one below TN~650 K. The drawbacks of BFO for bulk practical applications are the low resistivity and the difficult to synthetize single-phased polycrystalline materials. To overcome the low DC electrical resistivity, one solution is doping these materials with multiple valence ions like Mn. Also, Cr ions can be used to improve polarization. Therefore, in this work, we describe the structural; dielectric, magnetic and Mossbauer spectroscopy studies in 0.9BiFeO3 - 0.1BaTiO3 solid solutions doped with Mn and Cr processed by high-energy ball milling. Especially for the Mn doped samples a structurally correlated magnetization enhancement is reported. X-ray diffraction and Rietveld refinement studies revealed a distorted perovskite structure with the coexistence of rhombohedral and monoclinic symmetries. Mössbauer spectroscopy results showed a magnetic spectral signature of ordered Fe3+ ions for the rhombohedral phase of the undoped sample and for both rhombohedral and monoclinic phases of the Mn doped samples. A significant magnetization increase (reaching 0.50 emu/g), associated to the magnetic ordering of the Cm phase and to the retention of the Mn3+ valence state was observed for Mn doped samples.
Fujian Normal University, China
Title: Synthesis of Pt-WO3@W/GNs as a bifunctional electro-photo catalyst for catalyzing methanol oxidation and oxygen reduction reaction
Time : 14:40-15:00
Prof. Dr. Shen Lin obtained her B.S. Degree at Xia Men University in China in 1982, and completed her Ph.D. with Prof. Shixiong Liu at Fuzhou University in China in 2002. She works as a professor since 2000 in College of Chemistry and Material Science, Fujian Normal University, China. Her current research focuses on the development of new synthesis strategies of Pt/GNs based and non- noble metal electrocatalysts for their application in cathode and anode reaction of fuel cell, hydrogen evolution reaction and carbon dioxide reduction. Until now, she has published 20+ the related papers with average Impact Factor (corresponding author) over 3 (IF>3)
Direct methanol fuel cells (DMFCs) have attracted increasing attention due to its low cost, high power density, ease of handling, and low operating temperature. And the multifunctional electro-catalysts which can be used simultaneously in both the anode (methanol oxidation reaction, MOR) and cathode (oxygen reduction reaction, ORR) are eagerly needed. So in this work, a bifunctional electro-photo catalyst Pt-WO3@W/GNs was synthesized by high temperature solid phase synthesis method, with two-dimensional plane structure graphene (GNs) as a support, and it was characterized by TEM, HAADF-STEM, XRD, XPS and Raman. It is found that Pt-WO3@W/GNs has two forms of W at the same time, that is the metal state (W) on the surface and the internal oxidation state (WO3), which is due to that only partial surface of WO3 is reduced during high temperature solid phase reaction. Furthermore, it is observed that its substrate GNs show an obvious wrinkle undergoing the high temperature process, and Pt-WO3@W nanoparticles are evenly dispersed on the surface of GNs, with the average particle size about 7.5 nm. Electro-catalytic properties of Pt-WO3@W/GNs were investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry, and electrochemical impedance spectrum (EIS), to discuss the effect of W oxophilic property and its different states on its catalytic properties towards MOR and ORR. The results indicate that both W and WO3 in Pt-WO3@W/GNs have a promoting effect on catalyzing MOR and ORR, resulting in a superior electro-catalytic property than that of commercial Pt-Ru/C. Especially, the presence of some W (0) can endow semiconductor WO3 different contact modes (Ohmic and Schottky contact) between W or Pt, which leads to a strong charge separation efficiency under light irradiation, so an efficient electro-photo-synergistic catalytic properties towards MOR and ORR under simulated sunlight was achieved. The founding in this work is helpful for converting solar energy into electric energy during traditional electro-catalytic process.
Sylvain G Cloutier
Ecole de Technologie Superieure, Canada
Title: Low-cost printable hybrid hetero structures for energy harvesting and lighting
Time : 15:00-15:20
Sylvain G Cloutier has completed his PhD at Brown University in 2006. He then received the DARPA Young Faculty Award for his work on the use of nano-engineered materials for lasers at the University of Delaware. In 2011, he joined Ecole de Technologie Superieure, Canada (ÉTS), where he leads both the Canada Research Chair on printable hybrid optoelectronic materials & devices and the Ariane Group Industrial Research Chair on Emerging Materials for Aerospace and Space. He was Lead Investigator on several large-scale research projects in the USA and Canada. He contributed over 80 publications and was elected at the College of the Royal Society of Canada in 2014.
The urgent demand for better and cheaper optoelectronic device architectures is a crucial road block towards a better use of our energy resources. As such, we explore new additive manufacturing paradigms in printable electronics to realize ultralow-cost, light weight and fully-integrated light-harvesting and energy-efficient optoelectronic devices using commercial-grade printing capabilities. While solution-processing techniques have yielded a wide range of new hybrid nano-engineered materials for optoelectronic applications, many key parameters including compatibility, interface engineering, surface treatment and processability are essential to achieve the best device performances. More recently, new solution processed materials including organometallics, new high-mobility conductive polymers and nanoparticle inks have shown tremendous potential for low-cost optoelectronic device integration. For example, power conversion efficiencies from printable organometallic solar cells have now surpassed 20%. These advances have also transposed into new photo detector devices with high responsivities. Just in the last year, our team made tremendous ground breaking progress towards viable devices by dramatically enhancing structure and material properties, enhancing conductivities by several orders of magnitude using hybrids, significantly improving stability and lifetime and dramatically improving the performances through advanced processing. In this presentation, we will summarize our work from the last five years exploring new hybrid heterostructures for low-cost opto electronic applications, including mainly light harvesting and lighting. We will present new printable sol gel based TiO2 collector architectures, which then led to promising low-cost solar cell architectures for production using commercial grade inkjet or aerosol printing capability. We will also describe in details how methyl ammonium lead-halide perovskite deposition and chemistry was adapted to produce low-cost photodetectors and LEDs using commercial-grade inkjet printing capability.
Tata Steel UK Limited, UK
Title: New generation of Colorcoat Prisma®
Time : 15:20-15:40
Anna Lewandowska has completed her PhD in Centre of Molecular and Macromolecular Studies at Polish Academy of Sciences in Poland then furthered her Postgraduate career with Postdoctoral placements at McMaster University in Canada. She has her expertise in Polymer Chemistry with “Experience in design and control of surface science”. She joined Tata Steel R&D in 2015 where she has built her technical knowledge of experience in Research & Development team being involved with many of research projects. Currently, she is a New Product Development Design Manager in Tata Steel UK Ltd. focusing on new generation of OCS products for building envelope sector.
Tata Steel has launched its new generation three layer Colorcoat Prisma® pre-finished steel, following a substantial investment on the manufacturing line. New Colorcoat Prisma® offers superior ultraviolet (UV) resistance and durability. The latest evolution is based on revolutionary three-layer technology, completely chromate free to be REACH compliant, that delivers greatly enhanced aesthetics with superior color and gloss retention. The new Colorcoat Prisma® product pushes the boundaries of pre-finished steel and is available with an extended Confidex® guarantee for up to 40 years. Colorcoat Prisma® is the result of many years of product development with R&D support, which provided all R&D data required for the product launch, including producing signed technical product specifications for all colors and trials. Working closely with the manufacturing, marketing, commercial and business development teams, R&D managed and delivered all the technical requirements, which enabled the enhanced guarantee package to be signed off by both Tata Steel Exco and back to back guarantee from the paint supplier. In order to develop a profitable business from outside of Europe markets for Prisma®, R&D delivered full assessments according to ASTM standards, performed externally which represent a distinct advantage.
Location: London B
University of Oldenburg, Germany
Gunma University, Japan
Title: Dynamic analyses of damping alloy sleeves for boring
Time : 17:00-17:15
Yuto Horigome is pursuing master degree program. He studied the characteristics of the damping alloy sleeve for boring at National Institute of Technology, Gunma College (NITGC). He entered Gunma University after graduating from NITGC, and he studies Machining Science.
The NC lathe is one of the major metal cutting machine tool. The overhang amount of the tool become large at boring with the NC lathe. The tool vibration often become a problem at boring. The surface roughness and tool life are affected by the tool vibration. Therefore, it is necessary to reduce the tool vibration at boring with NC lathe. In this study, the application of damping alloy for the NC lathe sleeve was proposed. The characteristic of damping alloy is absorb vibration by transforming dynamic energy of the vibration into heat energy. A cutting experiment was operated by using the new type sleeve made of only damping alloy and the traditional type sleeve made of steel. The results such as vibration, surface roughness and tool life are compered between the both tools. The tool vibration became small and the tool life became long with new type sleeve compared to the traditional type sleeve. However the surface roughness became large by using new type sleeve. It is supposed that the rigid of new type sleeve is smaller than that of traditional type sleeve.
Therefore, the composite sleeve that was combined with damping alloy and steel was developed for improving the rigidity. As a result, the tool vibration using the composite sleeve indicated one fifth and the surface roughness became half compared to the steel sleeve. The vibration analysis based on this experimental results was studied to clarify the vibration mechanism. The modal analysis was operated with the structural analysis software by using 3D models. And the FFT analysis was operated by the vibration data. As a result, it was revealed that the natural frequency of cutting tool system with new type sleeve was changed compared to the traditional system. And it was revealed that the bending mode frequency was closed to the twist mode frequency.
Military Technical College, Egypt
Title: Infrared spectra of aluminum fluorocarbon polymer compositions to thermal signature of jet engine
Time : 17:15-17:30
Amir Elsaidy has completed his Graduation in Chemical Engineering at Military Technical College, Egypt. He has experience in preparations and developments in the field of Chemical Engineering and Energetic Materials by creating new pathways for improvements and; his interest is focused on “Preparation and spectral performance evaluation of these materials”. These materials were developed by granulation and subsequent pressing and their spectral performance was conducted.
Decoy flares are energetic materials, which are capable of yielding thermal signature to interfere with IR guided missile seekers. The flare thermal signature depends on the duration and intensity of the exothermal reaction and on the chemical nature of the combustion products. Aluminum is the preferred metallic fuel for different pyrotechnic compositions because of its high stability and (high heat source), while magnesium runs in the second place due to lack of its stability. Aluminum is widely employed in wide applications particularly thermite compositions and flare compositions. In this study, different decoy flare formulations based on aluminum/Teflon/Viton (ATV) (with fuel percentage ranging from 40:70 wt %) were prepared by granulation and subsequent pressing. The spectral performance of developed decoy flare formulations were measured to the thermal signature of jet engine nozzle using (FT-MIR 2-6 µm) spectrophotometer. The thermal signature of jet engine was characterized with two characteristic peaks over α band (2-3 µm) and β band (3-5 µm); this thermal signature was correlated to black body emission by the nozzle at 690°C. The characteristic intensity ratio ɵ=Iα/Iβ=0.3. The developed decoy flares offered similar thermal signature but with higher intensity due to the formation of carbon soot and AlF as nearly ideal emitter and active IR emitter respectively. Quantification of these emitting species and combustion temperature was conducted using the ICT thermodynamic code. ATV decoy flare with 50wt % Al offered an increase in the intensity of α band and β by 6 and 1.5 times respectively. The main IR emitting species in this formulation is (AlF) in the combustion flame. The characteristic intensity ratio Ɵ was found to be 0.73. This manuscript would open the route for the development of customized decoy flares with tailored spectral performance.
P M Radingoana
Université Paul-Sabatier, Toulouse, France
Title: Thermoelectric properties of ZnO-based ceramics prepared by spark plasma sintering technique
Time : 17:30-17:45
P M Radingoana is a PhD student at Université Paul Sabatier-CIRIMAT. She is currently working on “Spark plasma sintering of ZnO/polymer composites for thermoelectric application”. Her research interests include Renewable Energies and Sustainable Development.
The scarcity and toxicity of high performance thermoelectric materials (such as Bi, Pb, Sb, Te etc.,) has shifted research to focus on metal oxides and organic materials. Recently, inorganic–organic hybrids are of interest due to minimized thermal conductivity and selective scattering of charge carriers that leads to high sea beck coefficient. In this work, Zn0.96Al0.04O prepared through co-precipitation route was sintered using spark plasma sintering. Polyaniline (PANI) concentrations of 5wt% and 9wt% were compared. High dense ceramic of 98.5±0.03% was obtained at a low sintering temperature of 250°C using Zn0.96Al0.04O/5wt% PANI. Increasing PANI concentration decreased the relative density. Incorporation of PANI into the inorganic material reduced the thermal conductivity from 27 W/mK (0 wt% PANI) to 5.2 W/mK (5 wt% PANI) and 3.2 W/mK (9 wt% PANI) at 40°C. Maximum ZT of 2.2x10-6 is obtained at 200°C with PANI concentration of 9 wt%. These findings are an opening for low temperature applications of ZnO-based ceramics.
Gunma University, Japan
Title: Cold plastic forming of ABS plastic pipe: ABS plastic pipe
Time : 16:30-16:45
Kentaro Tsunoda is pursuing his 4th undergraduate. He studied cold plastic forming of plastic pipe at Gunma University, Japan. He has done his research at the Faculty of Mechanical engineering of the Gunma University. He has attended two conferences presenting his research works.
This paper describes about cold plastic forming of ABS plastic pipe. Experiment and Finite element method (FEM) analysis of pipe expansion process were operated. The application of ABS plastic pipe for air conditioner is under consideration instead of metal pipe in Japan because of weight saving of air conditioner for lowering the gravity point against earthquake. The parts of ABS plastic pipe is generally produced by injection molding. The processes need the cooling time, and it takes much time. In addition, expensive mold die is needed for each application. Thus, cold plastic forming of ABS plastic pipe was proposed. The cold plastic forming of ABS plastic pipe chosen for this study is hardly studied by other authors. Product ability of cold plastic forming is higher than the injection molding or hot working. And the punch and die shape is simple comparing to these process. In this study, pipe expansion process was operated. The ABS plastic pipe has a 10 mm diameter and 8mm inner diameter and 1 mm thickness. At first, true stress and true strain curves at any strain rate were measured by ring compression test. Obtained flow stresses was used to FEM analysis. Experimental device for pipe expansion process was made by Dip Inc.. Objective inner diameter was 10 mm. FEM analysis was operated to clarify the deformation behavior such as load-stroke diagram. It was possible to produce the expanded ABS pipe. The whitening of worked pipe and strain recovery was observed. Analysis result was indicated the good agreement comparing to experimental result in load-stroke diagram.
Gunma University, Japan
Title: FEM analysis for burring process of large diameter SUS304 tube
Time : 16:00-16:15
Junshi Ichikawa is pursuing his 1st year postgraduate degree. He studied Metal Plastic Forming and FEM Analysis at the Gunma University, Japan. He has done his research at the Faculty of Mechanical Science and Technology of the Gunma University. He has attended six conferences presenting his research works and has published three papers in high impact journals.
This paper describes a finite element method (FEM) analysis for cold burring process of large diameter SUS304 pipe. The large diameter pipes such as 216.3 mm are used for a plant as a flow channel of gas and liquid. A burring process of pipe is generally for forming the branch. Burring molding is one of the typical molding techniques for branch pipes. The burring process is achieved by drawing of die from prepared hole. And the branch pipes are generally joined by welding.
However this process has some problem. First, the burring process is depending on the forming limit of pipe. Second, the wall thickness and strain distribution of formed branch edge is unequal. These problem is caused the pre-hole shape. It generally has difficulty to determine the optimum pre-hole shape. Many try and error is needed. In this study, we proposed that the method of estimation for optimum pre-hole shape of mother pipe by finite element method analysis. The nominal diameter of mother pipe is 200A. And the target nominal diameter of branch pipe is 100A. The diameter is 114.3 mm, and the wall thickness is 3.0 mm. And target burring wall height is 10 mm with uniformly wall height around the edge. The height 10 mm means that is not needed the machining after burring process and is easy to weld to join the branch pipe to mother pipe. Initial pre-hole shape of analysis model is simple circle. After FEM analysis, the height of burring position was measured. Then the diameters of longitudinal direction and circumferential direction was adjusted. After optimum diameter of both direction diameter was determined, the diameter of 45 °direction was analyzed by using point tracking function to estimate of initial optimum diameter. Eventually, the burring formed shape had an uniform 10 mm height. It was clarified that the method of estimation for optimum pre-hole was effective.
Gunma University, Japan
Title: Horizontal twin roll casting of aluminum alloy A7075
Time : 16:15-16:30
Yuta Kashitani is pursuing his 1st year postgraduate degree. He studied Metal Strip Casting at the Gunma University, Japan. He has done his research at the Faculty of Mechanical Science and Technology of the Gunma University. He has attended six conferences presenting his research works and has published three papers in high impact journals.
This paper describes a horizontal type twin roll strip casting process for producing aluminum alloy strip of A7075. Twin roll casting process is able to produce a strip from molten metal directly. Thus this process has a possibility to reduce total cost of sheet making comparing to conventional rolling process. Strip casting process has some disadvantages. Casting speed depends on the material properties. It is difficult to determine the casting conditions. Aluminum alloy A7075 has high tensile strength, and it is known as a material for aerospace application. The sheet is manufactured in small quantities comparing to the other sheet aluminum alloy. Because A7075 alloy sheet is generally needed to a number of rolling and annealing process after hot extrusion. It is supposed that the demand of high tensile strength aluminum sheet such as A7075 is going to increase for weight saving of structural material. In this study, the effect of pouring temperature on the strip was investigated. Castability, surface conditions microstructure and strip thickness were estimated. It was possible to produce strip at any pouring temperature by horizontal twin roll strip casting process. Each surfaces of produced strip were transcribed form the roll surface, and the surfaces had a metallic luster. Minor cracks occurred at pouring temperature 710°C. Solidification cracking occurred at a pouring temperature of 740℃. Generally, the strip thickness tends to decrease as the pouring temperature increases. However, the strip thickness of pouring temperature of 710℃ and 740℃ increased compared with the pouring temperature of 680℃. Moreover, the strip thickness decreased at the pouring temperature of 770℃. As a result of observing the microstructure, equiaxed crystals were produced at any pouring temperature.
China Agricultural University, China
Title: Engineering protein interfaces yields ferritin disassembly and reassembly under benign experimental conditions
Time : 16:45-17:00
Hai Chen is a PhD student in College of Food Science and Nutritional Engineering at China Agricultural University, working on Engineering and Application of Protein Nanostructure, especially Ferritin Nano Cages.
Ferritin is a class of naturally occurring iron storage protein; it usually consists of 24 subunits that form a hollow protein shell with high symmetry. Recently, scientists have subverted these nature functions and used reversibly self-assembled property of apoferritin cage controlled by pH for the encapsulation and delivery of bioactive nutrients or anticancer drug. In all these cases, the ferritin cages shield their cargo from the influence of external conditions and provide a controlled microenvironment. However, since ferritin disassociation generally needs extreme acidic condition (pH≤2), this strategy is limited to the structures of bioactive compounds that are unstable at such low pH. Here, we engineered protein interfaces to yield ferritin nano cages which disassemble at pH 4.0 and reassemble at pH 7.5. During this process, bioactive molecules can be encapsulated within protein cavity. Thus, this engineered protein has the potential to be exploited as an alternative nano carrier for pH-sensitive bioactive compounds or drugs.