首页 > 论文 > 液晶与显示 > 33卷 > 10期(pp:870-876)

一种光学状态可由电场控制的液晶复合材料的制备与表征

Preparation and characterization of liquid crystal composite material with electrically controlled optical states

胡望   宋黎  
  • 摘要
  • 论文信息
  • 参考文献
  • 被引情况
  • PDF全文
分享:

摘要

液晶材料对电、热、磁、光等外界物理量的变化具有不同的响应特性,向其中添加具有一定特性的化合物,可以得到具备一定响应特性的液晶复合材料。利用所制备的液晶复合材料对于电场变化具有响应特性的特点,制备出具有信息记录功能的复合材料。合成手性离子液体,按一定配比将其加入手征向列相液晶(N*-LC)中,得到反射波段可电控的手征向列相液晶/手性离子液体复合材料。实验结果表明:材料初始状态为光透射状态;对材料施加直流电压40 V时,样品表现为光散射状态,透过率低于10%;施加高频交流电压40 V时,样品表现为半透明镜面反射,反射范围覆盖400~750 nm,透射率为45%左右;撤去电场后,可恢复至初始状态,并且每种状态都具有一定的记忆效应。该种液晶复合材料制备简单,无需紫外辐射工艺,且具有电场响应特性,可以通过电场控制在可见光范围内表现出光透射、强烈光散射、半透明镜面反射3种不同状态,具有记忆效应,操作简单方便。

Abstract

Liquid crystal materials provide different responses to changes of external physical quantities, such as electric field, heat, magnetic field and light, and liquid crystal composites with certain response characteristics can be prepared by adding compounds with certain properties. Composite materials with information recording function can be prepared based on the prepared liquid crystal composites with responses to electric field changes. Chiral ionic liquid was synthesized. By proportionally adding the sythesized chiral ionic liquid into N*-LC, an N*-LC/chiral ionic liquid composite material was obtained, whose reflective wavelengths were electrically controlled. Experimental results indicate that the prepared N*-LC/chiral ionic liquid composite material is in an original light-transmitting state. When a direct voltage of 40 V is applied, the material is switched to a light-scattering state with a light transmittance being less than 40%. When a high-frequency alternating voltage of 40 V is applied, the material is switched into a semitransparent mirror reflecting state with a reflecting range of 400~750 nm and a light transmittance being about 45%. When the electric field is removed, the material recovers to the original state, and all these states can be memorized for some time. The liquid crystal composite material can be prepared easily without UV radiation process. The liquid crystal composite material has response characteristics to electric field, and can be electrically switched among three different states of light transmission, strong light scattering and semitransparent mirror reflection within a visible-light wavelength range. The liquid crystal composite material also has memory effect, and the switching operation is easy and convenient.

Newport宣传-MKS新实验室计划
补充资料

中图分类号:TP394.1;TH691.9

DOI:10.3788/yjyxs20183310.0870

所属栏目:材料与器件

基金项目:宁夏科技厅重点研发计划项目(No. 2015026);国家质检总局科技创新项目(2016QK087)

收稿日期:2018-04-27

修改稿日期:2018-07-04

网络出版日期:--

作者单位    点击查看

胡望:宁夏计量质量检验检测研究院,宁夏 银川 750200中国质量认证中心,北京 100070
宋黎:新兴际华集团有限公司,北京 100020

联系人作者:胡望(kobe8hu@163.com)

备注:胡望(1984-),男,河北石家庄人,博士,2010年于北京科技大学获得博士学位,现就职于中国质量认证中心,从事认证认可检验检测领域相关研究及科研管理工作。E-mail: kobe8hu@163.com

【1】COMISKEY B, ALBERT J D, YOSHIZAWA H, et al. An electrophoretic ink for all-printed reflective electronic displays [J]. Nature, 1998, 394(6690): 253-255.

【2】CHEN Y, AU J, KAZLAS P, et al. Electronic paper: Flexible active-matrix electronic ink display [J]. Nature, 2003, 423(6936): 136.

【3】HAYES R A, FEENSTRA B J. Video-speed electronic paper based on electrowetting [J]. Nature, 2003, 425(6956): 383-385.

【4】BROER D J, LUB J, MOL G N. Wide-band reflective polarizers from cholesteric polymer networks with a pitch gradient [J]. Nature, 1995, 378(6556): 467-469.

【5】HIKMET R A M, KEMPERMAN H. Electrically switchable mirrors and optical components made from liquid-crystal gels [J]. Nature, 1999, 392(6675): 476-479.

【6】YANG H, MISHIMA K, MATSUYAMA K, et al. Thermally bandwidth-controllable reflective polarizers from (polymer network/liquid crystal/chiral dopant) composites [J]. Applied Physics Letters, 2003, 82(15): 2407-2409.

【7】BIAN Z Y, LI K X, HUANG W, et al. Characteristics of selective reflection of chiral nematic liquid crystalline gels with a nonuniform pitch distribution [J]. Applied Physics Letters, 2007, 91(20): 201908.

【8】MITOV M, BOUDET A, SOPNA P. From selective to wide-band light reflection: a simple thermal diffusion in a glassy cholesteric liquid crystal [J]. European Physics Journal B, 1999, 8(3): 327-330.

【9】BOUDET A, BINET C, MITOV M, et al. Microstructure of variable pitch cholesteric films and its relationship with the optical properties [J]. European Physics Journal E, 2000, 2(3): 247-253.

【10】BINET C, MITOV M, BOUDET A. Bragg reflections in cholesteric liquid crystals: from selectivity to broadening and reciprocally [J]. Molecular Crystals and Liquid Crystals Science and Technology, 2000, 339(1): 111-123.

【11】VAN DEWITTE P, BREHMER M, LUB J. LCD components obtained by patterning of chiral nematic polymer layers [J]. Journal of Materials Chemistry, 1999, 9(9): 2087-2094.

【12】肖久梅,何万里,高瑾,等. 温度对玻璃态胆甾相环硅氧烷液晶中分子分布的影响[J]. 华东理工大学学报(自然科学版),2006,32(2):160-164.
XIAO J M, HE W L, GAO J, et al. Effects of temperature on the molecular distribution of a glassy cholesteric siloxane cyclic side-chain liquid crystal [J]. Journal of East China University of Science and Technology (Natural Science Edition), 2006, 32(2): 160-164. (in Chinese)

【13】XIAO J M, CAO H, HE W L, et al. Wide-band reflective polarizers from cholesteric liquid crystals with stable optical properties [J]. Journal of Applied Polymer Science, 2007, 105(5): 2973-2977.

【14】XIAO J M, ZHAO D Y, CAO H, et al. New micro-structure designs of a wide band reflective polarizer with a pitch gradient [J]. Liquid Crystals, 2007, 34(4): 473-477.

【15】FUKUMOTO K, YOSHIZAWA M, OHNO H. Room temperature ionic liquids from 20 natural amino acids [J]. Journal of the American Chemical Society, 2005, 127(8): 2398-2399.

【16】HEILMEIER G H, ZANONI L A, BARTON L A. Dynamic scattering: a new electrooptic effect in certain classes of nematic liquid crystals [J]. Proceedings of the IEEE, 1968, 56(7): 1162-1171.

【17】GRAY G W, HARRISON K J, NASH J A. New family of nematic liquid crystals for displays [J]. Electronics Letters, 1973, 9(6): 130-131.

【18】SCHADT M, VON PLANTA C. Conductivity relaxation in positive dielectric liquid crystals [J]. The Journal of Chemical Physics, 1975, 63(10): 4379-4383.

引用该论文

HU Wang,SONG Li. Preparation and characterization of liquid crystal composite material with electrically controlled optical states[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(10): 870-876

胡望,宋黎. 一种光学状态可由电场控制的液晶复合材料的制备与表征[J]. 液晶与显示, 2018, 33(10): 870-876

您的浏览器不支持PDF插件,请使用最新的(Chrome/Fire Fox等)浏览器.或者您还可以点击此处下载该论文PDF