Biography: Prof. Jong Hak Kim received his Ph.D. degree in Chemical Engineering department of Yonsei University, South Korea in 2003. He worked as a postdoctoral researcher in the department of materials science and engineering at Massachusetts Institute of Technology (MIT) until he joined Yonsei University in 2005 as an assistant professor. He is now a full professor of Chemical and Biomolecular Engineering department in Yonsei University. His current research interests include the design and synthesis of graft copolymers and their applications to gas separation membranes and polymer electrolyte for electrochemical devices. He has a publication record of over 270 papers in refereed international journals such as Adv. Mater., Adv. Funct. Mater., ChemSusChem, ACS Appl. Mater. Interfaces, J. Membr. Sci., Chem. Eng. J. and etc. The sum of the times cited is 5785 and h-index is 48.
Speech Title: High-performance Gas Separation Membranes Based on Graft Copolymers
Abstract: Membrane technology has gained recognition due to various advantages such as easy manufacture, low energy consumption, low operating costs, environmental safety, and facile application of functionalized nanomaterials. Extensive research has been conducted on polymers containing ether groups, such as poly(ethylene oxide) (PEO), that undergo Lewis acid-base interactions, where the oxygen atoms of the ether group act as the Lewis base and CO2 acts as the Lewis acid. However, unmodified, neat PEO membranes have limited applicability as gas separation membranes due to the difficulty in controlling their high crystallinity. Our group synthesized various amphiphilic graft copolymers using a low-cost radical polymerization and applied to gas separation membranes. Recently we reported the mixed matrix membranes having a CO2 permeance of 1321.6 GPU with a moderate CO2/N2 selectivity of 30.8 without humidification based on adhesive graft copolymer and amine-functionalized UiO-66. It exceeds the target performance required for practical application to the post-combustion CO2 capture process.
Biography: Dr. Xiaohong Zhu is currently a full professor at the Department of Materials Science & Engineering, Sichuan University, China. He received his BSc degree in Materials Physics from Sichuan University in 2000 and PhD degree in Condensed Matter Physics from the Institute of Physics, Chinese Academy of Sciences in 2006. After that, he did 3-year postdoctoral research at CNRS and CEA in France, and then joined Sichuan University as a professor in 2009. From April 2012 to April 2013, he was also a research scholar at the Department of Physics & Department of Materials Science and Engineering, University of California, Berkeley, USA. He was selected as a New Century Excellent Talent in University of China in 2009 and an Outstanding Young Scientific and Technological Leader of Sichuan Province, China in 2011, and won the 2018 China Industry-University-Research Collaboration Promotion Award. Prof. Zhu’s research interests include mainly graphene-based electrode materials and novel solid-state electrolytes for energy storage devices (supercapacitors and lithium-ion batteries), piezoelectric ceramics, as well as multifunctional oxide thin films and related electronic devices. Until now, he has authored/co-authored more than 110 SCI-indexed papers and 2 scientific books.
Biography: Ki Bong Lee received his BE and MS from Department of Chemical Engineering, Korea University, Korea in 1999 and 2001, respectively, and PhD from the School of Chemical Engineering, Purdue University, USA in 2005. He worked as a post-Doctoral research associate in Department of Chemical Engineering, Lehigh University, USA from 2006 to 2007. He was a senior researcher at the Korea Institute of Energy Research from 2008 to 2009. He has been a professor at the Department of Chemical and Biological Engineering, Korea University since 2009.
Speech Title: CaO-based high-temperature CO2 sorbents and their application
Abstract: High-temperature CO2 sorption is attracting great interest as a technology to reduce anthropogenic greenhouse gas emission to atmosphere, and the development of high-temperature CO2 sorbents is imperative for the realization of this technology. One of candidate solid materials, CaO has been highlighted because of its outstanding theoretical sorption capacities. However, CaO-based sorbents need harsh conditions for regeneration and the sorption uptakes are significantly decreased during cyclic sorption/desorption procedure.
For practical application of CaO-based sorbents, this talk will introduce (i) enhancement of CO2 sorption performance of CaO and (ii) its long-term operation (cyclic stability), and (iii) reactivation after cyclic usage. The CaO-based sorbents were prepared using various methods and significantly enhanced CO2 sorption uptake was achieved with ball-milling and citrate sol-gel methods. These preparation methods produced CaO with small particle size, and the particle size was found to be the most critical property determining CO2 sorption uptake. The CO2 sorption uptake of CaO prepared using ball-milling and citrate sol-gel methods were 76.9 wt% and 77.3 wt%, respectively, almost reaching the theoretical maximum CO2 sorption uptake of CaO (78.5 wt%). Although the high CO2 uptake was achieved, a significant drawback of CaO, rapid deactivation of CO2 sorption performance of CaO with cyclic usage, was unavoidable. Low cyclic stability of CaO is due to low thermal stability of CaCO3, and for this reason, a small amount of thermally stable ZrO2 was added to CaO using the citrate sol-gel method. The citrate sol-gel method induced chemically attached Zr on the surface of CaO as tiny grain-like particles, resulting in effective enhancement of cyclic sorption performance. The deactivation of CaO-based sorbents was noticeably delayed by Zr, however, perfect prevention from deactivation was impossible. This led to the second issue: to develop reactivation process after cyclic usage of CaO. Particle-size-dependency of CaO on CO2 sorption uptake was used to physically reactivate the cycled sorbent by reducing the size of CaO particles aggregated after cyclic usage. The lost CO2 sorption uptake of the used CaO was successfully recovered by particle size reduction through ball-milling. The CaO-based sorbents with high CO2 sorption uptake and good cyclic stability as well as newly suggested reactivation procedure are highly meaningful considering practical application.
Biography: Dr. Ru is currently a Professor in department of mechanical engineering, University of Alberta, Canada. Dr. Ru received his doctorate in solid mechanics at Peking University (China), and then worked in the Institute of Mechanics, Chinese Academy of Science and held a number of visitor/research positions in several universities in Italy, USA and Canada. He joined the University of Alberta in 1997 and became a Professor in 2004. Dr. Ru’s past research areas include plastic buckling of structures, mechanics of elastic inclusions, electroelastic mechanics, and some applied mathematics problems related to solid mechanics. Besides traditional areas of solid mechanics, his recent research interests include solid mechanics at micro/nano scales, cell biomechanics, and dynamic ductile fracture.