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대한화학회 제124회 학술발표회 및 총회 Size fractionation of Graphene Oxide by Asymmetrical Flow Field-Flow Fractionation

등록일
2019년 8월 22일 12시 49분 47초
접수번호
3008
발표코드
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발표시간
목 09시 : 54분
발표형식
구두발표
발표분야
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
공동저자
Myoungjae Ko, Myeong Hee Moon*
Department of Chemistry, Yonsei University, Korea
Graphene is known to have surprising properties including electrical, thermal and mechanical properties. However, graphene still has many problems with applications on the market, because of low solution dispersibility and poor processability. To solve these problems, graphene oxide liquid crystal (GOLC) was discovered. In contrast to graphene, GOLC is a two-dimensional graphene-based material that has a good processability at large scales and is well dispersed due to the liquid crystal characteristics, therefore, it is expected to be utilized for the various applications. However, GO has a wide size distribution due to various factors in the synthesis step. GO size distribution needs to be controlled because it relates to the liquid crystal characteristics of GO. Many studies have been conducted to solve the problem of wide size distribution of graphene oxide, but it has not been solved effectively yet. These studies pose problems with size separations that modify graphene oxide. This study was aimed to find an optimal condition for the size-based separation of GO using asymmetrical flow-field fractionation (AF4). For the confirmation of size separation, fractions GO were collected and analyzed using scanning electron microscopy (SEM) and optical microscopy (OM). As a result, GO in plate form can beseparated by hyperlayer separation mode of AF4 with the recovery of GO within 70% to 90%.

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