Ionic conductivity induced loss of birefringence of banana-shaped liquid crystal
The effects of ionic conductivity on the electrooptical properties of a chiral banana-shaped liquid crystal 1,3-phenylene bis4-3-chloro-4(3,7-dimethyloctyloxyl) phenyliminomethyl benzoate were investigated with the techniques of polarizing optical microscopy and dielectric spectroscopy. When the banana-shaped liquid crystal was experienced a low-frequency (1Hz) triangular waveform electric field, its polarizing optical microscopic textures were first turned into gray and then into black at about 95℃, a few degrees lower than the clearing temperature of the banana-shaped liquid crystal. Detailed dielectric spectroscopic characterizations showed that ionic conductivity increased exponentially as the temperature increased from 72 to 110℃. Our results suggested that dominant ionic conductivity near its clearing temperature is responsible for the electric-field induced loss in the birefringence of the banana-shaped liquid crystal.
Banana-shaped liquid crystal birefringence polarizing optical microscopy secondary dynamic scattering
Yuan Ming Huang Bao-Gai Zhai
College of Physics & Electronic Information, Yunnan Normal University, Yunnan 650092, China Modern Educational Technology Center, Yunnan Normal University, Yunnan 650092, China
国际会议
2009 International Symposium on Liquid Crystal Science and Technology(2009国际液晶科技研讨会)
昆明
英文
220-223
2009-08-02（万方平台首次上网日期，不代表论文的发表时间）