Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals  

作　　者：马恒 孙瑞芝 李振新 刘玉芳 

机构地区：[1]College of Physics and Information, Henan Normal University [2]Department of Life Science and Technology, Xinxiang Medical College

出　　处：《Chinese Physics B》2008年第1期255-258,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 60577050)

摘　　要：Temperature dependence of ratio between dielectric anisotropy and order parameter of fluorinated nematic liquid crystal is investigated by using a semi-empirical molecular orbital package that can accurately calculate an angle between molecular dipole moment and long axis. We optimize the molecular conformations with three semi-empirical Hamiltonians AM1, PM3 and PM5, and then make a comparison between computational results and experimental measurements. It is shown that the results obtained from AM1 method are in good agreement with the measurements. The present study offers an applicable method to predict the dielectric properties of liquid crystal material.Temperature dependence of ratio between dielectric anisotropy and order parameter of fluorinated nematic liquid crystal is investigated by using a semi-empirical molecular orbital package that can accurately calculate an angle between molecular dipole moment and long axis. We optimize the molecular conformations with three semi-empirical Hamiltonians AM1, PM3 and PM5, and then make a comparison between computational results and experimental measurements. It is shown that the results obtained from AM1 method are in good agreement with the measurements. The present study offers an applicable method to predict the dielectric properties of liquid crystal material.

关 键 词：dielectric anisotropy order parameter FLUORINE nematic liquid crystal 

分 类 号：O753.2[理学—晶体学]