121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-522
Subject Surface Functionalization Effect of Graphene Oxide on its Colloid and Bulk Behavior
Authors yulim Hong, youngkwan kim*
Carbon Composite Materials Research Center, Korea Institute of Science and Technology, Korea
Abstract Graphene oxide (GO), the oxidized form of graphene with various oxygen functional groups, is a promising building block for development of a strong composite material when considering its manufacturing cost and aqueous processability. A liquid crystal (LC) phase formation, the state between liquid and solid crystal, in aqueous phase is one of the most interesting properties of GO and this property originated from its high colloidal dispersibility and aspect ratio. It is well known that the aspect ratio and concentration of GO are known to be important parameter for LC phase formation, whereas the chemical structural effect on LC phase formation has not clearly explored. Herein, we investigated the chemical structural effect of GO on the LC phase formation at the same aspect ratio and concentration. The changes of GO’s colloidal and bulk-assembled properties by surface functionalization were systematically examined by using UV-Vis, x-ray photoelectron, Fourier transform infrared and Raman spectroscopy, rheometer, zetapotential analyzer, polarizing microscope and universal testing machine. Based on the results, we found that the critical concentration of GO for LC phase formation is varied depending on the surface oxygen functional groups and this change considerably affected the bulk-assembled properties of GO.
E-mail T16717@kist.re.kr