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| 題名: | Isomerization-induced phase separation of a mixture of monomer, azobenzene, and liquid crystals |
| 作者: | 劉鄭楷;Fuh, Andy Ying-Guey;Liu, Yen-Chen;Cheng, Ko-Ting;Liu, Cheng-Kai;Chen, Yuan-Di |
| 貢獻者: | 理學院光電科學與工程學系 |
| 關鍵詞: | Azobenzene;Illumination;Liquid Crystal;PHASE SEPARATION;Scattering |
| 日期: | 2014-01-01 |
| 上傳時間: | 2026-04-23 11:34:47 (UTC+8) |
| 出版者: | American Scientific Publishers |
| 摘要: | 摘要： We propose a novel phase separation method, referred to as isomerization-induced phase separation (IIPS), applicable to a mixture comprising monomers, nematic liquid crystal (LC), and azobenzene LC (azo-LC). The resulting structures, termed as monomer-dispersed gel LCs (MDGLCs), can be formed by both dark IIPS and bright IIPS, which indicates that IIPS occurs without and with light irradiation, respectively. The MDGLC structures in a cell are reconstructed, indicating that the IIPS is a repeatable phase separation process. A cell filled with the mixture initially exhibits a scattering mode and can be switched to multi-stable transparent states after UV irradiation. The switchability is due to the isothermal phase transition resulting from trans- to cis-isomerization processes. An application of the IIPS on an optically controllable scattering mode light shutter, having the advantages of multi-stability, optically switchability, polarizer-free, with high contrast ratio, and other properties, is experimentally demonstrated. Conversely, the transparent mode of MDGLCs can be switched back to the scattering mode by green-light illumination to achieve bright IIPS, or by thermal treatment. Grayscales (multi-stable states) can also be elicited by UV illumination under various durations. The selectively unpolymerized monomer and azo-LC in this system are the keys to achieve high-performance multi-stable scattering MDGLCs.
出版者： American Scientific Publishers
出版日期： 2014-01-01
出處： Science of advanced materials, 2014-01, Vol.6 (1), p.37-43
識別號： ISSN: 1947-2935
識別號： DOI: 10.1166/sam.2014.1678 |
| 顯示於類別: | [光電科學與工程學系] 期刊論文
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