Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls

Hui ZHANG; Gui-li ZHENG; Yi TIAN; Zhi-dong ZHANG

doi:10.3788/YJYXS20163108.0740

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Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls

Material and Device | 更新时间：2020-07-07

- Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls
- Chinese Journal of Liquid Crystals and Displays Vol. 31, Issue 8, Pages: 740-747(2016)
- 作者机构：
  
  1.河北工业大学电子信息工程学院, 天津 300401
  2.天津市电子材料与器件重点实验室, 天津 300401
  3.河北工业大学理学院, 天津 300401
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20163108.0740
  CLC： O753+.2
- Received：25 March 2016，
  
  Accepted：11 May 2016，
  
  Published：2016-08
- 稿件说明：
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Hui ZHANG, Gui-li ZHENG, Yi TIAN, et al. Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls[J]. Chinese journal of liquid crystals and displays, 2016, 31(8): 740-747.
DOI：

Hui ZHANG, Gui-li ZHENG, Yi TIAN, et al. Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls[J]. Chinese journal of liquid crystals and displays, 2016, 31(8): 740-747. DOI： 10.3788/YJYXS20163108.0740.

摘要

基于Pramoda Kumar等人文章中关于向列相液晶反转壁中+1缺陷处挠曲电效应的实验现象，我们利用Landau-de Gennes理论给出相应的理论分析。当对弱锚定的平行排列向列相液晶盒施加垂直基板的直流电压，在反转壁中的±1缺陷会发生旋转。对于其中的+1缺陷，我们给出了外加电场作用下液晶分子的自由能表达式并通过模拟描述指向矢的方位角和极角的变化情况给出相应的缺陷处电场驱动的结构变化。模拟结果给出的挠曲电效应引起的方位角的变化角度与Pramoda Kumar等人的实验得到的在+1缺陷处消光刷的变化情况是一致的。

Abstract

Based on the experimental phenomena of flexoelectric response at defect sites in nematic inversion walls conducted by Pramoda Kumar

et al

we gave the theoretical analysis using the Landau-de Gennes theory. When a direct-current electric field normal to the plane of substrate is applied to the parallel aligned nematic liquid crystal cell with weak anchoring

the rotation of ±1 defects in the narrow inversion walls can be exhibited. The free energy of liquid crystal molecules around the +1 defect site was formulated and the electric field driven structural changes at the defect site characterized by polar and azimuthal angles of the local director were simulated. The results reveal that the deviation of azimuthal angle induced by flexoelectric effect are consistent with the switching of extinction brushes at the +1 defect obtained in the experiment conducted by Pramoda Kumar

et al

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Keywords

references

谢毓章.液晶物理学[M].北京:科学出版社, 1998:108-113.

XIE Y Z. Physics of Liquid Crystal [M]. Beijing: Science Press, 1998:108-113. (in Chinese)

CHANDRASEKHAR S. Liquid Crystals [M]. 2nd ed. Cambridge: Cambridge University Press, 1992: 205-207.

MEYER R B. Piezoelectric effects in liquid crystals[J]. Physical Review Letters , 1969, 22(18): 918-921.

OUTRAM B I, ELSTON S J. Alignment of cholesteric liquid crystals using the macroscopic flexoelectric polarization contribution to dielectric properties[J]. Applied Physics Letters , 2013, 103(14): 141111.

OUTRAM B I, ELSTON S J. Frequency-dependent dielectric contribution of flexoelectricity allowing control of state switching in helicoidal liquid crystals[J]. Physical Review E , 2013, 88(1): 012506.

HARDEN J, MBANGA B, ÉBER N, et al . Giant flexoelectricity of bent-core nematic liquid Crystals[J]. Physical Review Letters , 2006, 97(15): 157802.

YE W J, XING H Y, CUI W J, et al . Determining the sum of flexoelectric coefficients in nematic liquid crystals by the capacitance method[J]. Chinese Physics B , 2014, 23(11):116101.

郑桂丽, 张辉, 叶文江, 等.全漏光导波技术确定液晶材料的挠曲电系数[J].光子学报, 2014, 43(12):1231003.

ZHENG G L, ZHANG H, YE W J, et al . Determination of the flexoelectric coefficient in liquid crystal using fully-leaky optical guided wave technique[J]. Acta Photonica Sinica , 2014, 43(12): 1231003. (in Chinese)

CASTLES F, MORRIS S M, TERENTJEV E M, et al . Thermodynamically stable blue phases[J]. Physical Review Letters , 2010, 104(15): 157801.

KUMAR P, KRISHNAMURTHY K S. Flexoelectric response at defect sites in nematic inversion walls[J]. Liquid Crystals , 2006, 33(2): 131-138.

CHAIKIN P M, LUBENSKY T C. Principles of Condensed Matter Physics [M]. Cambridge: Cambridge University Press, 1995.

KLÉMAN M. Points, Lines and Walls in Liquid Crystals, Magnetic Systems and Various Disordered Media [M]. New York: Wiley, 1983.

NEHRING J, SAUPE A. On the schlieren texture in nematic and smectic liquid crystals[J]. Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics , 1972, 68: 1-15.

RYSCHENKOW G, KLEMAN M. Surface defects and structural transitions in very low anchoring energy nematic thin films[J]. The Journal of Chemical Physics , 1976, 64(1): 404-412.

AMODDEO A, BARBERI R, LOMBARDO G. Electric field-induced fast nematic order dynamics[J]. Liquid Crystals , 2011, 38(1): 93-103.

SPENCER T J, CARE C M. Lattice Boltzmann scheme for modeling liquid-crystal dynamics: zenithal bistable device in the presence of defect motion[J]. Physical Review E , 2006, 74(6): 061708.

NOBILI M, DURAND G. Disorientation-induced disordering at a nematic-liquid-crystal-solid interface[J]. Physical Review A , 1992, 46(10): R6174-R6177.

ZHOU X, ZHANG Z D. Dynamics of order reconstruction in a nanoconfined nematic liquid crystal with a topological defect[J]. International Journal of Molecular Sciences , 2013, 14(12): 24135-24153.

GUZMÁN O, ABBOTT N L, DE PABLO J J. Quenched disorder in a liquid-crystal biosensor: adsorbed nanoparticles at confining walls[J]. The Journal of Chemical Physics , 2005, 122(18): 184711.

BARBERI R, CIUCHI F, DURAND G E, et al . Electric field induced order reconstruction in a nematic cell[J]. The European Physical Journal E , 2004, 13(1): 61-71.

QIAN T Z, SHENG P. Orientational states and phase transitions induced by microtextured substrates[J]. Physical Review E , 1997, 55(6): 7111-7120.

SPENCER T J, CARE C M, AMOS R M, et al . Zenithal bistable device: comparison of modeling and experiment[J]. Physical Review E , 2010, 82(2):021702.

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