Dielectric and electro-optical responses of a dielectrically negative nematic liquid crystal doped with cationic surfactant

Hassanein Shaban, Po Chang Wu, Jia Hong Lee, Wei Lee*

*此作品的通信作者

研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)

摘要

Cetyltrimethylammonium bromide (CTAB) was employed as an ionic dopant dispersed into a nematic liquid crystal characterized by its negative dielectric anisotropy. The electrohydrodynamic (EHD) effect in liquid crystal cells impregnated with various contents of CTAB was studied by dielectric spectroscopy and the corresponding electro-optical responses of the cells driven by an AC electric field were investigated. Compared with the undoped counterpart, the frequency range of the EHD regime after doping with 0.2-wt% CTAB into the liquid crystal was widened, and distinct optical textures, including dynamic scattering, stripes, and grids were unambiguously observed. The CTAB addition reduced the threshold voltage required for switching the planar state to other optical states generated by the EHD effect.

原文English
頁(從 - 到)3208-3222
頁數15
期刊Optical Materials Express
11
發行號9
DOIs
出版狀態Published - 1 9月 2021

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