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

doi:10.1088/1674-1056/17/1/044

中国物理B ›› 2008, Vol. 17 ›› Issue (1): 255-258.doi: 10.1088/1674-1056/17/1/044

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

马恒¹, 孙瑞芝¹, 刘玉芳¹, 李振新²

(1)College of Physics and Information, Henan Normal University, Xinxiang 453007, China; (2)Department of Life Science and Technology, Xinxiang Medical College, Xinxiang 453003, China

出版日期:2008-01-20 发布日期:2008-01-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No 60577050).

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

Online:2008-01-20 Published:2008-01-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No 60577050).

摘要/Abstract

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.

关键词: dielectric anisotropy, order parameter, fluorine, nematic liquid crystal

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.

Key words: dielectric anisotropy, order parameter, fluorine, nematic liquid crystal

中图分类号: (Molecular and microscopic models and theories of liquid crystal structure)

61.30.Cz

77.22.-d (Dielectric properties of solids and liquids)

马恒, 孙瑞芝, 李振新, 刘玉芳. Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals[J]. 中国物理B, 2008, 17(1): 255-258.

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[J]. Chin. Phys. B, 2008, 17(1): 255-258.

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

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

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