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通过图案照明时间分辨相显微镜观察液晶相变过程中的分子无序过程分析

Analysis of Molecular Disordering Processes in the Phase Transition of Liquid Crystals Observed by Patterned-Illumination Time-Resolved Phase Microscopy.

作者信息

Sato Nozomi, Katayama Kenji

机构信息

Department of Applied Chemistry, Chuo University, Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.

出版信息

Materials (Basel). 2021 Sep 23;14(19):5491. doi: 10.3390/ma14195491.

DOI:10.3390/ma14195491
PMID:34639889
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8509586/
Abstract

The initial processes of the phase transition dynamics of liquid crystals (LCs) subject to UV pulse irradiation were clarified using a nanosecond time-resolved imaging technique called pattern-illumination time-resolved phase microscopy (PI-PM). Two types of LCs were studied: a photo-responsive LC and dye-doped LCs. We found two steps of molecular disordering processes in the phase transition, namely local disordering proceeding anisotropically, followed by the spreading of the isotropic phase. These two processes were separated for a photo-responsive LC while being simultaneously observed for the dye-doped LCs. It was found that the photomechanical dyes induced the phase transition process faster than the photothermal dyes.

摘要

利用一种名为图案照明时间分辨相显微镜（PI-PM）的纳秒时间分辨成像技术，阐明了受紫外脉冲照射的液晶（LC）相变动力学的初始过程。研究了两种类型的液晶：光响应液晶和染料掺杂液晶。我们发现在相变过程中有两个分子无序化步骤，即各向异性地进行局部无序化，随后是各向同性相的扩展。这两个过程在光响应液晶中是分开的，而在染料掺杂液晶中是同时观察到的。结果发现，光机械染料比光热染料能更快地诱导相变过程。

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