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Chinese Physics, 2006, Vol. 15(5): 1041-1050    DOI: 10.1088/1009-1963/15/5/029
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Threshold and saturation properties of the field-induced twist cell with two parameters weak anchoring boundaries

Guan Rong-Hua (关荣华)ab, Sun Yu-Bao (孙玉宝)b 
a Department of Applied physics, North China Electric Power University, Baoding 071003, China; b Department of Applied Physics, Hebei University of Technology, Tianjin 300130, China
Abstract  On the basis of two-parameter formula of weak surface coupling anchoring energy of nematic liquid crystals proposed by Zhao et al recently, the general torque equilibrium equation and boundary conditions of the director have been obtained and the threshold field as well as the saturation field of the field-induced twist cell have been analysed for three kinds of configurations, i.e. homogeneous, splay and Pi cells formed by different rubbing conditions and pretilt angles. The results indicated that the polar anchoring has no effect on the threshold field. It is determined only by the twist anchoring and pretilt angle. But, the polar anchoring and twist anchoring are coupling with each other and have a great influence on the saturation field. The formulae for calculating the threshold field and saturation field are given. These results will be very useful in understanding surface physics and the design of liquid crystal cells.
Keywords:  threshold field      saturation field      two-parameter formula      nonzero pretilt angle  
Received:  10 November 2005      Revised:  24 February 2006      Accepted manuscript online: 
PACS:  61.30.Hn (Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions)  
  61.30.Cz (Molecular and microscopic models and theories of liquid crystal structure)  
  61.30.Gd (Orientational order of liquid crystals; electric and magnetic field effects on order)  
  64.70.M- (Transitions in liquid crystals)  
Fund: Project supported by the Theoretical Physics Special Foundation of the National Natural Science of China (Grant No 10447107),the Natural Science Foundation of Hebei Province, China (Grant No A2006000675), the Doctoral Foundation of Hebei Province, China (

Cite this article: 

Guan Rong-Hua (关荣华), Sun Yu-Bao (孙玉宝) Threshold and saturation properties of the field-induced twist cell with two parameters weak anchoring boundaries 2006 Chinese Physics 15 1041

[1] Influences of the surface elastic energy term K13 on the critical fields of liquid crystal cells and experimental measurement of K13
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[2] ON THE SATURATION BEHAVIOUR OF TWISTED NEMATIC LIQUID CRYSTAL CELLS WITH A NONZERO PRETILT ANGLE
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