| Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals |
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| 作者姓名： | 马恒 孙瑞芝 李振新 刘玉芳 |
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| 作者单位： | College of Physics and Information, Henan Normal University, Xinxiang 453007, China;College of Physics and Information, Henan Normal University, Xinxiang 453007, China;Department of Life Science and Technology, Xinxiang Medical College, Xinxiang 453003, China;College of Physics and Information, Henan Normal University, Xinxiang 453007, China |
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| 基金项目： | Project
supported by the National Natural Science Foundation of China (Grant
No 60577050). |
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| 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.
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| 关 键 词： | 电介质 各异向性 命令参数 氟 液体晶体 |
| 收稿时间： | 2007-02-06 |
| 修稿时间： | 2007-07-16 |
Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals |
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| Ma Heng,Sun Rui-Zhi,Li Zhen-Xin and Liu Yu-Fang.Temperature dependence of ratio between dielectric anisotropy and order parameter in fluorinated nematic liquid crystals[J].Chinese Physics B,2008,17(1):255-258. |
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| Authors: | Ma Heng Sun Rui-Zhi Li Zhen-Xin and Liu Yu-Fang |
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| Institution: | College of Physics and Information, Henan Normal University, Xinxiang 453007, China; Department of Life Science and Technology, Xinxiang Medical College, Xinxiang 453003, China |
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| 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. |
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| Keywords: | dielectric anisotropy order
parameter fluorine nematic liquid crystal |
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