组成和聚合条件对掺杂铁电纳米粒子的液晶-聚合物复合材料电光性能的影响。

Effects of Composition and Polymerization Conditions on the Electro-Optic Performance of Liquid Crystal-Polymer Composites Doped with Ferroelectric Nanoparticles.

作者信息

Nordendorf Gaby, Jünnemann-Held Gisela, Lorenz Alexander, Kitzerow Heinz-Siegfried

机构信息

Department of Chemistry, Faculty of Science, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany.

Center for Optoelectronics and Photonics Paderborn (CeOPP), Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany.

出版信息

Nanomaterials (Basel). 2024 May 31;14(11):961. doi: 10.3390/nano14110961.

DOI:10.3390/nano14110961

PMID:38869586

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11173507/

Abstract

The presence of a polymer network and/or the addition of ferroelectric nanoparticles to a nematic liquid crystal are found to lower transition temperatures and birefringence, which indicates reduced orientational order. In addition, the electro-optic switching voltage is considerably increased when a polymer network is formed by in situ polymerization in the nematic state. However, the resulting polymer network liquid crystal switches at similar voltages as the neat liquid crystal when polymerization is performed at an elevated temperature in the isotropic state. When nanoparticle dispersions are polymerized at an applied DC voltage, the transition temperatures and switching voltages are reduced, yet they are larger than those observed for polymer network liquid crystals without nanoparticles polymerized in the isotropic phase.

摘要

研究发现，聚合物网络的存在和/或将铁电纳米颗粒添加到向列型液晶中会降低转变温度和双折射，这表明取向有序性降低。此外，当在向列态通过原位聚合形成聚合物网络时，电光开关电压会显著增加。然而，当在各向同性态的升高温度下进行聚合时，所得的聚合物网络液晶在与纯液晶相似的电压下切换。当纳米颗粒分散体在施加的直流电压下聚合时，转变温度和开关电压会降低，但它们比在各向同性相中聚合的无纳米颗粒的聚合物网络液晶所观察到的要大。