| 세션명 | 콜로이드 및 분자조립 부문위원회 (I) |
|---|---|
| 발표장 | 제3회장 |
| 논문코드 | 1L3-4 |
| 발표일 | 2021-10-21 |
| 발표시간 | 15:15-15:40 |
| 논문제목 | Universal Alignment of Graphene Oxide in Suspension and Fibers |
| 발표자 | 김소연 |
| 발표자 소속 | 서울대학교 |
| 저자 | 김소연† |
| 소속 | 서울대학교 |
| 논문초록 | Graphene oxide (GO) has become a key component for high-performance carbon-based films or fibers based on its dispersibility and liquid crystallinity in an aqueous suspension. While the superior performance of GO-based films or fibers relies on their alignment at the sub-micrometer level, fine control of the microstructure is often hampered, in particular, under dynamic nature of GO-processing involving shear. Here, we systemically study the structural variation of GO suspensions under shear with unprecedented detail via in-situ rheo-scattering and rheo-POM analysis. The evolution of GO alignment under shear is indeed complex. However, we find the GO alignment can be readily controlled with a dimensionless parameter suggesting a universal orientational diagram. In addition, we reveal the optimal shear rate for the highest degree of alignment, where the resultant graphene fiber attains the improvement of mechanical properties by ~54% without any chemical modification. |
THE POLYMER SOCIETY OF KOREA