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Materials 2015, 8(9), 6071-6084; doi:10.3390/ma8095293

Optothermal Switching of Cholesteric Liquid Crystals: A Study of Azobenzene Derivatives and Laser Wavelengths

1
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou 54561, Taiwan
2
Graduate Program of Optoelectronic Technology, National Chi Nan University, Nantou 54561, Taiwan
3
Department of Medical Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Jang-Kun Song
Received: 14 August 2015 / Accepted: 7 September 2015 / Published: 11 September 2015
(This article belongs to the Special Issue Materials for Display Applications)
View Full-Text   |   Download PDF [16593 KB, uploaded 11 September 2015]   |  

Abstract

The laser-initiated thermal (optothermal) switching of cholesteric liquid crystals (CLCs) is characterized by using different azobenzene (Azo) derivatives and laser wavelengths. Under 405-nm laser irradiation, Azo-doped CLCs undergo phase transition from cholesteric to isotropic. No cis-to-trans photoisomerization occurs when the 405-nm laser irradiation is blocked because only a single laser is used. The fast response of Azo-doped CLCs under the on–off switching of the 405-nm laser occurs because of the optothermal effect of the system. The 660-nm laser, which cannot be used as irradiation to generate the transcis photoisomerization of Azo, is used in Anthraquinone (AQ)-Azo-doped CLCs to examine the optothermal effect of doped Azo. The results show that the LC-like Azo derivative bearing two methyl groups ortho to the Azo moiety (A4) can greatly lower the clearing temperature and generate large amount of heat in AQ-A4-doped CLCs. View Full-Text
Keywords: optothermal; azobenzene; anthraquinone dye; cholesteric liquid crystal optothermal; azobenzene; anthraquinone dye; cholesteric liquid crystal
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Huang, T.-C.; Chen, Y.-Y.; Chu, C.-C.; Hsiao, V.K.S. Optothermal Switching of Cholesteric Liquid Crystals: A Study of Azobenzene Derivatives and Laser Wavelengths. Materials 2015, 8, 6071-6084.

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