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Open AccessArticle

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
Materials 2015, 8(9), 6071-6084; https://doi.org/10.3390/ma8095293
Received: 14 August 2015 / Accepted: 7 September 2015 / Published: 11 September 2015
(This article belongs to the Special Issue Materials for Display Applications)
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
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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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