Prof. Han-Yong Jeon
Inha University, South Korea
Prof. Han-Yong Jeon, male, geosynthetics/technical organic materials researcher, graduated from textile engineering department, Hanyang University in 1979. He worked for Hyejeon College, 1982-1990 and Howon University, 1990-1992, Chonnam National University, 1992-2005 and now works for Inha University. Since 1998, he is the director of Geosynthetics Institute (USA)-Korea Directory. From 2008-2012, he worked in International Geosynthetics Society as Council member (2006~2012) and he was the 6th president of Korean Geosynthetics Society (2011~2013). Also, he is members of ASTM D35 and ISO TC221 on geosynthetics from 1998. Now he is elected the 32nd President of Korean Fiber Society (2014~2015). He has published 117 papers and more than 742 papers in domestic and international conferences. Also, he wrote 18 texts including 'GEOSYNTHETICS’ and also published 98 papers in domestic & international journals. He has awards of Marquis Who'sWho - Science and Engineering in 2003~2014 and Top 100 Scientists in the World: 2005/2011 of IBC (International Biographical Centre, UK). Also, he got the 33rd Academy Award of Korean Fiber Society in 2006 and “Excellent Paper Award of 2012” by The Korean Federation of Science and Technology Societies. Area of Specialization Manufacturing, Application and Evaluation of Technical Organic Materials Manufacturing, Evaluation, Standardization & Regulation of Geosynthetics Polymeric Geocomposites etc.
Speech Title: Nanofiber
Formation of LCP/PET Blended Droplet by Repetitive Extrusion and Sea-Island
Fibrillation by Spinning
Abstract: Firstly, it is planned to verify control of droplet via study of its behaviors that are influenced by repetitive extrusion of LCP (Liquid Crystal Polymer) and PET (Polyethylene terephthalate) blend substance and confirms size changes of droplet while it is extrude repeatedly. LCP is a high strength polymer which shows characteristics that are the rigid main chain and molecule’s arrangement which has directivity. If nanofiber is manufactured depending on LCP, it will be effective that if material of droplet shape is able to become consecutive fiber morphology through stretching process. The research that deal with making continuity through the way to regulate size of droplet has not yet been achieved in existing dissertations of manufacturing of fibers related to droplet stretching method. Distributions of droplets were observed to LCP and PET blending process for conjugate spinning. Droplets were distributed relatively evenly in the initial extrusion process. But the secondary and third the size of the droplet was increased and the phenomenon was founded that the droplet was gathered in the center. This phenomenon was assumed that the miscibility of LCP/PET and the flow characteristics correlate with the phenomenon, so conducted the analysis. Analysis of distribution and component of droplet was conducted and miscibility of LCP/PET was analyzed.
Secondly, it is planned to verify control of sea-island fiber formation of LCP and PET blend by spinning process. Although there are some processes to produce nanofiber such as electrical spinning and sea-island fiber by conjugate spinning etc., it still has difficulties that electrical spinning has a low output and sea-island fiber by conjugate spinning using specified nozzle is restricted to reduce fiber diameter. This fibrillation changes show fibril formation and morphology according to the spinning parameters including nozzle and spinning related condition. Distributions of nanofiber fibrillation were observed to LCP and PET blending process for conjugate spinning. Fibrillated fibers of sea-island morphology were distributed relatively evenly in the spinning parameters. Effect of LCP/PET blending and spinning parameters on sea-island fibrillation to make nanofiber was investigated through morphological and crystallographic analysis.
Prof. Shen-Ming Chen
National Taipei University of Technology, Taiwan
Prof. Shen-Ming Chen (h-index > 60) received his
PhD degrees in chemistry from National Taiwan University, Taipei, Taiwan. He was
a visiting postdoctoral fellow with the Institute of Inorganic Chemistry,
Friedrich-Alexander University Erlangen-Nuremberg, Germany in 1997. He joined
Department of Chemical Engineering, National Taipei Institute of Technology,
Taipei, Taiwan in 1985. He had been an associate professor of Department of
Chemical Engineering, National Taipei Institute of Technology, Taipei, Taiwan
from 1991 to 1997. Since August 1997, he has been a full professor of Department
of Chemical Engineering and Biotechnology, National Taipei University of
Technology. He has been the Dean (Curator) of library, National Taipei
University of Technology, Taiwan from 2000 to 2006 and the Director of
Extracurricular Activity, office of student affairs, National Taipei University
of Technology, Taiwan from 1995 to 2000.
Prof. Shen-Ming Chen has published over 500 research and review papers in internationalSCI journals. Some of their papers have been selected as the most cited papers in theJournal of Electroanalytical Chemistry and Biosensor & Bioelectronics. He received threetimes Distinguish Professor awards. He also received three times Outstanding Research Award from National Taipei University of Technology, Taiwan. He have edited or attended two books for NOVA publications titled “Nanostructured Materials for Electrochemical Biosensors” and “Biosensors: Properties, Materials and Applications” and contributed four book chapters.
His research interest includes nanocomposites, bionanomaterials, bionanotechnology, electrochemical biosensor, biosensors, bioelectrochemistry,, chemical materials, electroanalytical Chemistry, electrocatalysis and electroanalysis, photoelectrochemistry, metalloproteins, metalloporphyrins, nanotechnology, spectroscopic techniques, scanning probe techniques, quartz crystal microbalance, materials research, fuel cells, solar cell and photovoltaic cells.
Speech Title: Design of
Advanced Nanomaterials for Smart Biosensors and Energy Storage Applications
Abstract: Hydrogen peroxide (H2O2) is an eminent biomarker in pathogenesis; a selective, high sensitive real-time detection of H2O2 released from live cells have drawn a significant research interest in bio-analytical chemistry. Binary transition metal oxides (BTMOs) displayed the recognizable benefit in enhancing the sensitivity of H2O2 detection, though reported BTMOs based H2O2 sensor’s detection limit is still insufficient, is not appropriate for in-situ profiling of trace amounts of cellular H2O2. In this, we describe an efficient, reliable electrochemical biosensor based on Mn2CuO4 microspheres to assay cellular H2O2. The MCO modified electrode delivered a broad working range (36 nM to 9.3 mM) appreciable detection limit (13 nM), with high selectivity towards H2O2. To prove its practicality, the developed sensor was applied in the detection of cellular H2O2 release by Raw 264.7 cells in presence of CHAPS. These results label the possible appliance of the sensor in clinical analysis, and pathophysiology. Thus, BTMOs are evolving as a promising candidate in designing catalytic matrices for biosensor applications.The existing carbon materials can be classified into activated carbon (0-dimensional), carbon nanotubes (CNT) (1-dimensional), graphene (2-dimensional) and carbon foams (3-dimensional). Among these, graphene is well known to be the top candidate; However, preparation of graphene from graphite is an intricate procedure that can lead to an explosion during the oxidation of graphite. Similarly, the preparation of CNT also has some practical difficulties due to the complicated instrument setup. Fascinatingly, the preparation of ACs is simple, environmentally friendly and cost-effective. For the first time, Pongam seed shells-derived activated carbon and cobalt oxide (~2-6 nm) nanocomposite (PSAC/Co3O4) is prepared for the high performance non-enzymatic glucose sensor and supercapacitors. Remarkably, the fabricated glucose sensor is found to be exhibit an ultra-high sensitivity with a lower detection limit, and long-term durability. Moreover, the PSAC/Co3O4 electrode possess an appreciable specific capacitance and long-term cycle stability. The high surface area carbon porous materials (CPMs) synthesized by the direct template method via self-assembly of polymerized phloroglucinol-formaldehyde resol around a triblock copolymer template were used as supports for nickel nanoparticles (Ni NPs). Further electrochemical measurements by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) also revealed that the Ni/CPM modified electrodes showed excellent sensitivity (59.6 µA µM-1 cm-2) and relatively low detection limit (2.1 nM) toward the detection of Hg(II) ion. The system is also been successfully applied for detection of mercuric ion in real sea fish samples. In addition, the synthesis of highly dispersed and stable ruthenium nanoparticles (RuNPs; ca. 2–3 nm) on porous activated carbons derived from Moringa Oleifera fruit shells (MOC) is reported. The as-prepared MOC carbonized at 900 oC was found to possess a high specific surface area (2522 m2 g−1) and co-existing micro- and mesoporosities. Upon incorporating RuNPs, the Ru/MOC nanocomposites loaded with modest amount of metallic Ru (1.0‒1.5 wt%) exhibit remarkable electrochemical and capacitive properties, achiving a maximum capacitance of 291 F g‒1 at a current density of 1 A g‒1 in 1.0 M H2SO4 electrolyte. These highly stable and durable biomass carbons modified electrodes, which can be facily fabricated by the eco-friendly and cost-effective route, should have great potentials for practical applications in energy storage, biosensing, and catalysis.
Assoc. Prof. Pan Jisheng
National University of Singapore (NUS), Singapore
Dr. Jisheng Pan received his B. Sc in Physics from Zhejiang University in 1985 and his M. Sc in Nuclear Physics in 1988 from Shanghai Institute of applied Physics, Chinese Academy of Sciences, where he worked for 6 years in nuclear technology. He graduated in 1998 with his PhD in surface science from National University of Singapore. Currently, he is a senior scientist and photoemission spectroscopy (PES) group leader in Institute of Materials Research & Engineering, Agency for Science, Technology and Research (A*Star), Singapore. He is also an Adjunct Associate Professor in the Department of Physics, National University of Singapore. His areas of research interest are photoemission technique development, 2D materials for nanodevice application, surface nanostructure formation, characterization and application on catalysis, growth and characterization of thin films for microelectronic device fabrication, Ion beam pattern of semiconductor surfaces. Dr. Pan has authored or co-authored more than 250 refereed journal articles, one patent, two know-hows and given more than 80 presentations at international conferences. He has also provided surface analysis and consulting service to many local and international companies in Singapore. In the past 10 years his research team has studied many material system interfaces such as metal/semiconductor, semiconductor/semiconductor, high-k insulator/semiconductor using PES technique. In addition, His team developed various models for different interfaces to eliminate possible photoemission charge effect in affecting the data analysis to obtain accurate band alignment information. The knowledge in this area can significantly contribute to the understanding of the mechanisms governing the properties of semiconductor interface. Dr. Pan has received many awards including achievement award from A*Star Aerospace Programme, 2015; Assessor Award (Silver) from Singapore Accreditation Council, 2015; “Best of session” paper accreditation at Semicon West Exhibition (San Jose, USA) in 2002; the Natural Science Award of Chinese Academy of Sciences in 1991. He is a technical assessor of Singapore Accreditation Council (SAC); a technical committee member of ISO/TC 201 surface chemical analysis, Singapore; an associate editor of Surface and Interface Analysis; an editorial board member of Journal of Spectroscopy. He is also a member of many professional societies such as AVS (USA), MRS (Singapore), IPS (Singapore) and NSC (China).
Speech Title: Studies of nanostructured material surface and thin film interface by X-ray photoelectron spectroscopy
Abstract: It is well known that X-ray photoelectron spectroscopy (XPS) is a very powerful tool for understanding the nature of solid surfaces. Although many newly developing tools with high spatial resolution play important role in the analysis of individual nanostructured features of materials XPS is still considered as an essential tool for understanding several important aspects of nanostructured materials that cannot easily be observed using other techniques. However, the question of how the nanostructured material features impact XPS data have been heavily debated in the scientific community, which limits its application in characterization of nanostructured materials. For example, there is consistent observation of cluster-size-dependent binding energy (BE) shifts. But there is substantial disagreement over the assignment of these shifts to initial or final state effects. As a result, the measured PES data can’t directly match to the electronic property of clusters because among the initial and final state effects, only the initial state effect involves information of changes in the electronic structure before photoemission, and hence is directly related to nanostructured material properties and is relevant for understanding other chemical process and reactions. In the first part of the presentation, I will talk to you the issues raised specifically for XPS analysis of nanostructured materials and followed by the method to overcome limitations through some examples of application of XPS to study nanostructured materials. In the second part, band energy alignment of different material interfaces such as semiconductor/semiconductor, metal/semiconductor, metal/insulator, semiconductor/insulator, 2D material interfaces determination by XPS will be presented. The performance of any type of hetero-junction device is determined by band energy alignment (band offsets) of material interfaces which form the hetero-junction. Therefore, accurately determining heterojunction band offsets and tuning them to a desired application would have an obvious impact on the optimization of the devices. The effects of chemical shift, differential charging, band bending and photoemission final state on the XPS measurement accuracy and reliability will be discussed.
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