外加电压频率对液晶介电各向异性的影响

戴亚雨; 高林; 庞泽; 李振杰; 蔡明雷; 王晓燕; 朱吉亮; 叶文江

doi:10.3788/YJYXS20183303.0175

您当前的位置：

首页 >

文章列表页 >

外加电压频率对液晶介电各向异性的影响

材料与器件 | 更新时间：2020-07-06

- 外加电压频率对液晶介电各向异性的影响
- Influence of the frequency of external applied voltage on the dielectric anisotropy of liquid crystal
- 液晶与显示 2018年33卷第3期页码：175-181
- 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
  3.河北省液晶显示器工程技术研究中心, 河北石家庄 050071
- 作者简介：
  
  [ "戴亚雨(1996-), 男, 江苏淮安人, 主要从事液晶物理及液晶器件物理方面的研究。E-mail:15102225686@163.com" ]
  [ "叶文江(1976-), 男, 河北正定人, 博士, 副教授, 2011年于河北工业大学获得博士学位, 主要从事液晶物理及液晶器件物理方面的研究。E-mail:wenjang_ye@hebut.edu.cn" ]
- 基金信息：
  
  国家自然科学基金(11374087);国家自然科学基金(11504080);河北省自然科学基金(A2014202123);河北省自然科学基金(A2017202004);大学生创新创业训练计划项目(QN2014130);河北省高等教育教学改革研究与实践项目(2017GJJG018);大学生创新创业训练计划项目(20170080289);河北省高校重点学科资助课题;the National Natural Science Foundation of China(11374087);by National Natural Science Foundation of China(11504080);Natural Science Foundation of Hebei Province(A2014202123);Natural Science Foundation of Hebei Province(A2017202004);Research Project of Hebei Education Department(QN2014130);Research and practice project of Hebei Province Higher Education and Teaching Reform(2017GJJG018);Project of College Students' Innovation and Entrepreneurship Training Program(20170080289);Key Subject Construction Project of Hebei Province University
- DOI：10.3788/YJYXS20183303.0175
  中图分类号： O753.2
- 收稿日期：2017-12-09，
  
  录用日期：2018-1-9，
  
  纸质出版日期：2018-03-05
- 稿件说明：
移动端阅览
戴亚雨, 高林, 庞泽, 等. 外加电压频率对液晶介电各向异性的影响[J]. 液晶与显示, 2018,33(3):175-181.

Ya-yu DAI, Lin GAO, Ze PANG, et al. Influence of the frequency of external applied voltage on the dielectric anisotropy of liquid crystal[J]. Chinese journal of liquid crystals and displays, 2018, 33(3): 175-181.
戴亚雨, 高林, 庞泽, 等. 外加电压频率对液晶介电各向异性的影响[J]. 液晶与显示, 2018,33(3):175-181. DOI： 10.3788/YJYXS20183303.0175.

Ya-yu DAI, Lin GAO, Ze PANG, et al. Influence of the frequency of external applied voltage on the dielectric anisotropy of liquid crystal[J]. Chinese journal of liquid crystals and displays, 2018, 33(3): 175-181. DOI： 10.3788/YJYXS20183303.0175.

摘要

液晶材料的介电各向异性通常与频率有关。为进一步研究频率对液晶材料介电常数的影响

首先

使用紫外可见分光光度计(METASH UV-9000S)和表面轮廓仪(Contor GK-T)分别测量液晶盒厚度以及聚酰亚胺(PI)取向层厚度

通过精密热台(LTS 350)控制实验温度20℃

使用精密LCR表(Agilent E4980A)测定4种不同液晶材料在100~2 000 Hz的频率内的平行和垂直排列向列相液晶盒电容; 然后

利用液晶盒电容模型计算出不同频率下液晶的平行和垂直介电常数

并绘制频率-介电各向异性曲线; 最后

分析频率对液晶介各向异性的影响。实验结果表明:温度一定

正性液晶的介电各向异性随频率的升高而减小

然后逐渐趋于平缓

负性液晶的介电各向异性随频率变化基本保持不变。此项研究对进一步分析液晶材料的介电特性具有一定的指导意义。

Abstract

The dielectric anisotropy of liquid crystal materials is usually related to the frequency.For further investigations of the influence of frequency on the dielectric constant of liquid crystal materials

firstly

the thickness of the liquid crystal cells and the thickness of the polymide (PI) orientation layers were measured by UV spectrophotometer (METASH UV-9000S) and Surface Profiler (Contor GK-T) respectively.The precision hot-stage (LTS 350) was used to control the experimental temperature of 20℃

and the capacitance of parallel and vertical aligned nematic liquid crystal cells were measured by a precision LCR meter (Agilent E4980A) at the frequency of 100~2 000 Hz for four different liquid crystal materials.Then

the parallel and vertical dielectric constants of liquid crystals at different frequencies were calculated through the capacitance model of LC cell

the curves of dielectric constant versus frequency were plotted as well.Finally

the influence of the frequency of external applied voltage on the dielectric anisotropy of liquid crystal was analyzed.The experimental results showed that the dielectric anisotropy of the positive liquid crystal decreased with the increase of the frequency at a certain temperature first

and then gradually flatten out

while dielectric anisotropy of negative liquid crystal remained unchanged with the change of frequency.This research has a guiding significance for further analysis of the dielectric characteristics of liquid crystal materials.

关键词

Keywords

references

WU S T, YANG D K. Fundamentals of Liquid Crystal Devices[M]. Chichester:John Wiley & Sons, 2014.

DUNMUR D A, DE LA FUENTE M R, PEREZ JUBINDO M A, et al . Dielectric studies of liquid crystals:the influence of molecular shape[J]. Liquid Crystals, 2010, 37(6-7):723-736.

BELYAEV B A, DROKIN N A, SHABANOV V F, et al . Dielectric properties of liquid crystals of the cyano derivative compounds with different fragments in the molecular core[J]. Physics of the Solid State, 2004, 46(3):574-578.

高鸿锦. 液晶化学[M].北京:清华大学出版社,2011.

GAO H J. Chemistry of Liquid Crystal[M]. Beijing:Tsinghua University Press, 2011. (in Chinese)

郝慧明,张平,张翰卿,等. 温度对液晶盒电容的影响[J]. 液晶与显示,2016,31(8):755-759.

HAO H M, ZHANG P, ZHANG H Q, et al . Influence of temperature on the capacitance of liquid crystal cell[J]. Chinese Journal of Liquid Crystals and Displays, 2016, 31(8):755-759. (in Chinese)

URBAN S, WÜRFLINGER A. Influence of Pressure on the Dielectric Properties of Liquid Crystals [M]//RZOSKA S J, ZHELEZNY V P. Nonlinear Dielectric Phenomena in Complex Liquids. Dordrecht:Springer, 2004:211-220.

POPOVA E V, GAMZAEVA S A, KRIVOSHEY A I, et al . Dielectric properties of magnetic nanoparticles' suspension in a ferroelectric liquid crystal[J]. Liquid Crystals, 2015, 42(3):334-343.

SALAMON P, ÉBER N, BUKA Á, et al . Dielectric properties of mixtures of a bent-core and a calamitic liquid crystal[J]. Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, 2010, 81(3):031711.

RIBEIRO DE ALMEIDA R R, ZHANG C, PARRI O, et al . Nanostructure and dielectric properties of a twist-bend nematic liquid crystal mixture[J]. Liquid Crystals, 2014, 41(11):1661-1667.

LAI C W, TING T L, HSU W H. Dielectric constant measurement of polyimide and liquid crystal at low frequency[J]. SID Symposium Digest of Technical Papers, 2016, 47(1):1679-1680.

JIAO M Z, GE Z B, SONG Q, et al . Alignment layer effects on thin liquid crystal cells[J]. Applied Physics Letters, 2008, 92(6):061102.

WU S T, WU C S. Experimental confirmation of the Osipov-Terentjev theory on the viscosity of nematic liquid crystals[J]. Physical Review A, 1990, 42(4):2219-2227.

YE W J, YUAN R, DAI Y Y, et al . Improvement of image sticking in liquid crystal display doped with γ -Fe 2 O 3 nanoparticles[J]. Nanomaterials, 2018, 8(1):8010005.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

含氟三环NCS液晶材料的介电性能研究

TFT-LCD中电容对公共电压的影响

液晶材料电学特性随温度变化研究

侧位含氟苯乙炔类液晶化合物的微波介电性能

交流发光二极管的研究进展