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Chin. Phys. B, 2009, Vol. 18(4): 1560-1563    DOI: 10.1088/1674-1056/18/4/044
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

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)
Department of Physics, Hebei University of Technology, Tianjin 300401, China
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 K1K3. We estimate the upper cell thickness to be 69 spin layers, in which the biaxial structure can be found.
Keywords:  hybrid nematic film      biaxial structure      spatially anisotropic pair potential      Monte Carlo simulation  
Received:  29 July 2008      Revised:  20 September 2008      Accepted manuscript online: 
PACS:  61.30.-v (Liquid crystals)  
  68.15.+e (Liquid thin films)  
  62.10.+s (Mechanical properties of liquids)  
Fund: 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.

Cite this article: 

Zhang Zhi-Dong(张志东), Chang Chun-Rui(常春蕊), and Ma Dong-Lai(马东来) Monte Carlo simulations of biaxial structure in thin hybrid nematic film based upon spatially anisotropic pair potential 2009 Chin. Phys. B 18 1560

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