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Liquid Crystals Volume 48, 2021 - Issue 7
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Article

Broaden reflection bandwidth of chiral nematic liquid crystals by chiral compound-loaded thermally responsive microcapsules

Hongyue Zhanga Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China;b Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
,
SiSi Tiana Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
,
Qian Wanga Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, ChinaCorrespondence[email protected]
,
Dong Wangb Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
&
Tong Zhaoa Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
Pages 1065-1072 | Received 23 May 2020, Accepted 18 Oct 2020, Published online: 03 Nov 2020
 
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ABSTRACT

Controllable broadband reflection of cholesteric liquid crystal (N*-LC) materials has sparked enormous interests due to its significance in areas such as infrared shielding glass films and LC displays. In this study, we report a novel method to broaden the bandwidth of the chiral nematic liquid crystal (N*-LC) by a thermally responsive microcapsule (TRMC) loaded with chiral compound. Diffusion of chiral compound loaded in the microcapsules triggered by heating resulted in non-uniform pitch distribution, which were locked by UV-radical polymerisation. The results showed that the reflection bandwidth could be broadened by adjusting mass of the microcapsules, heating time, UV intensity, concentration of UV-polymerisable free radical monomer and polymerisation temperature. The reflection bandwidth was broadened from 240 nm to 374 nm by optimising the above factors.

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Disclosure statement

No potential conflict of interest was reported by the author(s).

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