Electrically Induced Optical and Structural Response of Cholesteric and Nematic Droplets with Conical Boundary Conditions

IF 0.3 Q4 CRYSTALLOGRAPHY

Liquid Crystals and their Application Pub Date : 2022-12-22 DOI:10.18083/lcappl.2022.4.55

Kristina A. Feizer, M. Krakhalev, V. Y. Zyryanov

{"title":"Electrically Induced Optical and Structural Response of Cholesteric and Nematic Droplets with Conical Boundary Conditions","authors":"Kristina A. Feizer, M. Krakhalev, V. Y. Zyryanov","doi":"10.18083/lcappl.2022.4.55","DOIUrl":null,"url":null,"abstract":"The electro-optical response of polymer dispersed liquid crystals films has been studied. The polymer specifies the conical boundary conditions for the cholesteric and nematic LC. It is shown that for the cholesteric-based film with the relative chiral parameters of droplets equal to 0.32, control voltages are less than control voltages for the nematic-based film. The threshold voltages are 2.7 V and 4.9 V, and the saturation voltages are 7.3 V and 9.0 V for the cholesteric-based and nematic-based films, respectively. At saturation voltage, the light transmission of these films is over 80 %. The cholesteric-based film turns into a strong scattering state during 85 ms after switching off voltage, while the nematic-based film turns into initial scattering state during a few days. Significant differences in the electro-optical response of the studied films were explained using an examination of electrically induced transformations of the orientational structures formed in nematic and cholesteric droplets. Polymer dispersed cholesteric liquid crystals with conical boundary conditions are prospectful for the development of devices with low-voltage control.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.3000,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Liquid Crystals and their Application","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.18083/lcappl.2022.4.55","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}

引用次数: 0

Abstract

The electro-optical response of polymer dispersed liquid crystals films has been studied. The polymer specifies the conical boundary conditions for the cholesteric and nematic LC. It is shown that for the cholesteric-based film with the relative chiral parameters of droplets equal to 0.32, control voltages are less than control voltages for the nematic-based film. The threshold voltages are 2.7 V and 4.9 V, and the saturation voltages are 7.3 V and 9.0 V for the cholesteric-based and nematic-based films, respectively. At saturation voltage, the light transmission of these films is over 80 %. The cholesteric-based film turns into a strong scattering state during 85 ms after switching off voltage, while the nematic-based film turns into initial scattering state during a few days. Significant differences in the electro-optical response of the studied films were explained using an examination of electrically induced transformations of the orientational structures formed in nematic and cholesteric droplets. Polymer dispersed cholesteric liquid crystals with conical boundary conditions are prospectful for the development of devices with low-voltage control.

查看原文本刊更多论文

锥形边界条件下胆甾型和向列型液滴的电致光学和结构响应

研究了聚合物分散液晶薄膜的电光响应。聚合物规定了胆甾醇型和向列型LC的锥形边界条件。结果表明，对于液滴相对手性参数等于0.32的胆甾醇型薄膜，控制电压小于向列型薄膜的控制电压。对于胆甾醇型和向列型膜，阈值电压分别为2.7V和4.9V，饱和电压分别为7.3V和9.0V。在饱和电压下，这些薄膜的透光率超过80%。基于胆甾醇的膜在关断电压后的85ms期间变为强散射状态，而基于向列型的膜在几天期间变为初始散射状态。通过检查向列型和胆甾醇型液滴中形成的取向结构的电诱导转变，解释了所研究薄膜的电光响应的显著差异。具有锥形边界条件的聚合物分散胆甾醇型液晶对低压控制器件的发展具有广阔的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Liquid Crystals and their Application CRYSTALLOGRAPHY-

CiteScore

1.30

自引率

40.00%

发文量

期刊介绍： The Journal presents the following main directions of creation/construction, study and application of self-assembled materials: SYNTHESIS, STRUCTURE, PROPERTIES, MEDICINE, BIOLOGY, NANOTECHNOLOGY, SENSORS, PRACTICAL APPLICATION and INFORMATION. The journal is addressed to researchers, lecturers, university students, engineers. The publisher of the journal is the Nanomaterials Research Institute of "Ivanovo State University".