Orientations of side chains and adsorbed liquid crystal molecules on a rubbed polyimide surface studied by optical second harmonic generation.
Orientations of side chains and adsorbed liquid crystal molecules on a rubbed polyimide surface studied by optical second harmonic generation.
复制标题
通过光学二次谐波发生研究摩擦聚酰亚胺表面上侧链和吸附液晶分子的取向。
DOI：
10.1103/physreve.63.051706
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
S. Cheng
中科院分区：
文献类型：
--
作者：
S. Hong;M. Oh;X. Zhuang;Y. Shen;J. J. Ge;F. Harris;S. Cheng
利用表面二次谐波产生技术，获得了侧链聚酰亚胺摩擦表面上侧链和吸附液晶分子的近似取向分布。侧链和LC分子似乎在摩擦方向上排列良好，但在抗摩擦方向上远离表面倾斜。后者在夹在两个这样的表面之间的均匀对准的LC膜中产生负预倾角。然而，侧链和LC分子在表面具有反平行取向。
Surface second harmonic generation was used to obtain approximate orientational distributions of the side chains and the adsorbed liquid crystal (LC) molecules on a rubbed side-chain polyimide surface. Both the side chains and the LC molecules appear to be well aligned in the rubbing direction but tilted away from the surface in the antirubbing direction. The latter yields a negative pretilt angle in a homogeneously aligned LC film sandwiched between two such surfaces. The side chains and the LC molecules, however, have antiparallel orientations at the surface.