Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals
Ma Heng(马恒)a)†, Sun Rui-Zhi(孙瑞芝)a), Li Zhen-Xin(李振新)b), and Liu Yu-Fang(刘玉芳)a)
a College of Physics and Information, Henan Normal University, Xinxiang 453007, China; b Department of Life Science and Technology, Xinxiang Medical College, Xinxiang 453003, China
Abstract 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.
Accepted manuscript online:
PACS:
61.30.Cz
(Molecular and microscopic models and theories of liquid crystal structure)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
No 60577050).
Cite this article:
Ma Heng(马恒), Sun Rui-Zhi(孙瑞芝), Li Zhen-Xin(李振新), and Liu Yu-Fang(刘玉芳) Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals 2008 Chin. Phys. B 17 255
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