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Influence of Flexoelectric Effect on Director Alignment of Nematic Liquid Crystals in Axial Arrangement Cylindrical Cells 被引量:2

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摘要 A positive nematic liquid crystal(5CB)sample is confined in cylindrical cells under strong or weak axial anchoring boundary conditions when a radial nonuniform low-frequency electric field is applied and the flexoelectric effect is taken into account.Based on the Frank elastic free energy,the surface energy of the Rapini-Papoular approximation,the polarization free energy and the flexoelectric free energy caused by electric field,we obtain the free energy density of the nematic and solve the corresponding Euler-Lagrange equation numerically.We investigate the director distribution,the critical voltage and the critical exponent of nematic liquid crystal in cylindrical cells.It follows that the critical exponent is the classical one.It is also shown that the critical voltage in the system is affected by the flexoelectric effect,the geometric effect and radial weak anchoring effect on the cylindrical surfaces.A new type of director transition caused by the flexoelectric effect,the dielectric coupling effect and the radial weak anchoring effect is found.
作者 Hong-Hong Liu Yan-Jun Zhang Huai-Rui Yue Li-Zhi Zhu Rui-Xia Yang 刘红红;张艳君;岳怀瑞;朱礼智;杨瑞霞(Department of Physics,Hebei University of Technology,Tianjin 300401;School of Electronic and Information Engineering,Hebei University of Technology,Tianjin 300401;Department of Wood Science and Technology,Tianjin University of Science and Technology,Tianjin 300222)
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第2期52-56,共5页 中国物理快报(英文版)
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