Prof Yong Lak Joo, BP Amoco/H. Lawrence Fuller Professor
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Controlling the assembly of 2D materials such as graphene oxides (GO) at nanoscale has a significant impact on their properties and performance. One of critical issues on processing and handling of graphene oxides is that they need to be in dilution solution form (0.5 to 5 wt%) to maintain their high degree of exfoliation and dispersion for their use. As a result, the shipment of graphene oxides in general involves a huge volume of solvent (water) and thus the transport costs for large sales volume would become extremely high. Recently we have demonstrated that the assembly and structure of graphene oxide sheets are preserved without restacking when they are folded into layers via wet-spinning, followed by coagulation with charged solution. Based on these findings, we devised a cost-effective solid handling approach which involves i) processing graphene oxide sheets in solution into folded layers in solid state, ii) transporting layered graphene oxides to the customers, and iii) redispersion of folded graphene oxides into solution for their use. Through cross section SEM and HRTEM images together with XRD and AFM studies, we demonstrate that the similar assembly and structure of GO as in the original GO solution can be obtained, when layered graphene oxides are redispersed into solution, and that the proposed solid handling of GO followed by redispersion into solution can greatly reduce the transportation costs of graphene oxide materials.
講演者の経歴 (Yong Lak Joo)
Yong Lak Joo is the BP Amoco/H. Laurance Fuller Professor in the School of Chemical & Biomolecular Engineering at Cornell University. He received his B.S. degree at Seoul National University in Korea in 1989, and received his Ph.D. in Chemical Engineering at Stanford University in 1993. From 1993 and 1999, he was a senior research engineer at Hanwha Chemical Corporation in Korea. Prior to joining Cornell in 2001, Yong Lak Joo did two years of a postdoctoral research in the Department of Chemical Engineering at MIT.
His research focuses on the integration of molecular details into a macroscopic level in nanomaterials processing. In particular, he has recently laid the new foundation for experimental and theoretical studies on advanced, scalable nano-manufacturing processes based on the flow instability such as gas-assisted electrospinning and air-controlled electrospray. He is a fellow of American Institute of Chemical Engineers (AIChE). He received a 3M Faculty Award and is a recipient of a National Science Foundation CAREER Award and a DuPont Young Professor Award. He also received an Excellence in Teaching Award in College of Engineering, Cornell University.