中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1560-1563.doi: 10.1088/1674-1056/18/4/044

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Monte Carlo simulations of biaxial structure in thin hybrid nematic film based upon spatially anisotropic pair potential

张志东, 常春蕊, 马东来   

  1. Department of Physics, Hebei University of Technology, Tianjin 300401, China
  • 收稿日期:2008-07-29 修回日期:2008-09-20 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grants Nos 60736042 and 60878047), and the Key Subject Construction Project of Hebei Province University.

Monte Carlo simulations of biaxial structure in thin hybrid nematic film based upon spatially anisotropic pair potential

Zhang Zhi-Dong(张志东)†, Chang Chun-Rui(常春蕊), and Ma Dong-Lai(马东来)   

  1. Department of Physics, Hebei University of Technology, Tianjin 300401, China
  • Received:2008-07-29 Revised:2008-09-20 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grants Nos 60736042 and 60878047), and the Key Subject Construction Project of Hebei Province University.

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摘要： Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwohl--Lasher model. However, the step-like director's profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.

关键词: hybrid nematic film, biaxial structure, spatially anisotropic pair potential, Monte Carlo simulation

Abstract: Hybrid nematic films have been studied by Monte Carlo simulations using a lattice spin model, in which the pair potential is spatially anisotropic and dependent on elastic constants of liquid crystals. We confirm in the thin hybrid nematic film the existence of a biaxially nonbent structure and the structure transition from the biaxial to the bent-director structure, which is similar to the result obtained using the Lebwohl--Lasher model. However, the step-like director's profile, characteristic for the biaxial structure, is spatially asymmetric in the film because the pair potential leads to K1 ≠ K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.

Key words: hybrid nematic film, biaxial structure, spatially anisotropic pair potential, Monte Carlo simulation

中图分类号:  (Liquid crystals)

  • 61.30.-v
68.15.+e (Liquid thin films) 62.10.+s (Mechanical properties of liquids)