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Chin. Phys. B, 2008, Vol. 17(1): 255-258    DOI: 10.1088/1674-1056/17/1/044
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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.
Keywords:  dielectric anisotropy      order parameter      fluorine      nematic liquid crystal  
Accepted manuscript online: 
PACS:  61.30.Cz (Molecular and microscopic models and theories of liquid crystal structure)  
  77.22.-d (Dielectric properties of solids and liquids)  
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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