向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究

张晶; 周璇; 陈思博; 刘凯; 张志东

doi:10.3788/YJYXS20183301.0001

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向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究

材料与器件 | 更新时间：2020-07-06

- 向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究
- Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system
- 液晶与显示 2018年33卷第1期页码：1-13
- 作者机构：
  
  1.河北工业大学理学院, 天津 300401
  2.河北冀雅电子有限公司, 河北石家庄 050071
- 作者简介：
  
  [ "张晶(1992-), 女, 河北保定人, 硕士研究生, 从事液晶物理方面的学习和研究。E-mail:617758346@qq.com" ]
  张志东, E-mail:zhidong_zhang1961@163.com
- 基金信息：
  
  国家自然科学基金(11374087);the National Natural Science Foundation of China(11374087)
- DOI：10.3788/YJYXS20183301.0001
  中图分类号： O753.2
- 收稿日期：2017-07-24，
  
  录用日期：2017-8-12，
  
  纸质出版日期：2018-01-05
- 稿件说明：
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张晶, 周璇, 陈思博, 等. 向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究[J]. 液晶与显示, 2018,33(1):1-13.

Jing ZHANG, Xuan ZHOU, Si-bo CHEN, et al. Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system[J]. Chinese journal of liquid crystals and displays, 2018, 33(1): 1-13.
张晶, 周璇, 陈思博, 等. 向列相液晶畴壁中挠曲电效应和自发扭曲效应的理论研究[J]. 液晶与显示, 2018,33(1):1-13. DOI： 10.3788/YJYXS20183301.0001.

Jing ZHANG, Xuan ZHOU, Si-bo CHEN, et al. Theoretical study of flexoelectric effect and spontaneous distortion in domain walls within nematic liquid crystal system[J]. Chinese journal of liquid crystals and displays, 2018, 33(1): 1-13. DOI： 10.3788/YJYXS20183301.0001.

摘要

基于Landau-de Gennes理论，利用松弛迭代法，研究了电场诱导平行排列向列相液晶系统中的3种畴壁，以及畴壁中的挠曲电效应和自发扭曲效应。结果表明，畴壁存在的电压范围为0.2 ≤

≤ 1.2（

=1.45 V/

m）。单一常数近似下，相反方向外电场的挠曲电效应对扭曲壁中扭曲角的影响关于90°对称；对混合壁中扭曲角的影响是非对称的；对展-弯壁无影响。弹性各向异性时，外电场会诱导自发扭曲效应。该效应会使展-弯壁与混合壁中指向矢均由原角度变为90°，即沿壁切线方向排列；对扭曲壁结构无影响。挠曲电效应会在自发扭曲的基础上，对畴壁中指向矢扭曲角产生叠加影响。

Abstract

Based on Landau-de Gennes theory

we investigated the flexoelectric effect and spontaneous distortion effect within three different domain walls in parallel aligned nematic liquid crystal system influenced by electric field

using the relaxation iterative method. Our results show that

the domain walls in our system exist in the range of 0.2 ≤

≤ 1.2(

=1.45 V/

m). With one elastic constant approximation

flexoelectric effect with opposite direction of electric field will influence the twist angle of domain walls

which has 90° symmetry effect on twist wall

asymmetric effect on mixed wall

and no influence on spay-bend wall. Under the elastic anisotropy

external field will induce spontaneous distortion effect

which will change the twist angle from original angle to 90° bothin splay-bend wall and mixed wall

namely the director will reorient along the tangential direction of wall

but have no effect on twist wall. Beyond that

flexoelectric effect will have superposition impact on the director orientation in the domain wall.

关键词

Keywords

references

ELSTON S J. Flexoelectricity in nematic domain walls[J]. Physical Review E , 2008, 78(1):011701.

DE GENNES P G, PROST J. The Physics of Liquid Crystals [M]. Oxford:Oxford University Press, 1993:189-191.

LÉGER L. Walls in nematics[J]. Mol . Cryst . Liq . Cryst ., 1973, 24(1/2):33-44.

NETO A M F, MARTINOT-LAGARDE P, DURAND G. Anisotropy induced director refraction inside inversion walls in nematic liquid crystals[J]. J . Physique Lett ., 1984, 45(16):793-798.

De LÓZAR A, SCHÖPF W, REHBERG I. Transformation from walls to disclination lines:statics and dynamics of the pincement transition[J]. Physical Review E , 2005, 72(5):051713.

JEONG J, DAVIDSON Z S, COLLINGS P J, et al . Chiral symmetry breaking and surface faceting in chromonic liquid crystal droplets with giant elastic anisotropy[J]. Proceedings of the National Academy of Sciences of the United States of America , 2014, 111(5):1742-1747.

ATHERTON T J, SAMBLES J R. Orientational transition in a nematic liquid crystal at a patterned surface[J]. Physical Review E , 2006, 74(2):022701.

王永超, 张志东, 周旋.向列相液晶弹性各向异性诱导液晶盒产生漏光的研究[J].液晶与显示, 2015, 30(6):949-959.

WANG Y C, ZHANG Z D, ZHOU X. Study of light leakage induced by the elastic anisotropy of the nematic liquid crystal[J]. Chin . J . Liq . Cryst . Disp ., 2015, 30(6):949-959. (in Chinese)

LAVRENTOVICH O D, SERGAN V V. Parity-breaking phase transition in tangentially anchored nematic drops[J]. Il Nuovo Cimento D , 1990, 12(9):1219-1222.

XU F, KITZEROW H S, CROOKER P P. Director configurations of nematic-liquid-crystal droplets:negative dielectric anisotropy and parallel surface anchoring[J]. Physical Review E , 1994, 49(4):3061-3068.

DRZAIC P S. A case of mistaken identity:spontaneous formation of twisted bipolar droplets from achiral nematic materials[J]. Liquid Crystals , 1999, 26(5):623-627.

JAMES R, FUKUDA J I. Twist transition of nematic hyperbolic hedgehogs[J]. Physical Review E , 2014, 89(4):042501.

WANG Y C, ZHANG Z D, ZHOU X. Light leakage induced by spontaneous distortion of the nematic director in bulk defect structures[J]. Journal of Display Technology , 2016, 12(4):402-411.

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

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)

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

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

TIAN Y, ZHANG Z D. Interaction between a +1 defect in a nematic thin film and the surface wall and flexoelectric response at the defect site[J]. Liquid Crystals , 2015, 42(3):288-297.

KIM M S, BOS P J, KIM S W, et al . Flexoelectric effect in an in-plane switching (IPS) liquid crystal cell for low-power consumption display devices[J]. Scientific Reports , 2016, 6:35254.

WANG Y C, ZHOU X, YE W J, et al . New surface order reconstruction induced by electric field application in a nanoconfined HAN cell with a topological defect[J]. AIP Adv ., 2015, 5(10):107127.

KAISER P, WIESE W, HESS S. Stability and instability of an uniaxial alignment against biaxial distortions in the isotropic and nematic phases of liquid crystals[J]. J . Non-Equilib Thermodyn ., 1992, 17(2):153-169.

KRALJ S, ROSSO R, VIRGA E G. Finite-size effects on order reconstruction around nematic defects[J]. Physical Review E , 2010, 81(2):021702.

GUZMAN O, ABBOTTN L, DE PABLO J J. Quenched disorder in a liquid-crystal biosensor:adsorbed nanoparticles at confining walls[J]. J . Chem . Phys ., 2005, 122(18):184711.

张辉, 郑桂丽, 田毅, 等.对向列相液晶反转壁中+1缺陷处挠曲电效应的理论分析[J].液晶与显示, 2016, 31(8):740-747.

ZHANG H, ZHENG G L, TIAN Y, et al . Theoretical analysis of the influence of flexoelectric effect on the +1 defect site in nematic inversion walls[J]. Chin . J . Liq . Cryst . Disp ., 2016, 31(8):740-747. (in Chinese)

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