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구강희

Ku, Kang Hee
Polymers & Complex Fluids Laboratory
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Unveiling the structural influence of nematic mesogens on customizable temperature and spectral responses

Author(s)
Oh, Hyeong SeokKim, Kyeong JinLee, JuyoungKim, Jong BinKu, Kang Hee
Issued Date
2025-01
DOI
10.1016/j.jcis.2024.08.036
URI
https://scholarworks.unist.ac.kr/handle/201301/83774
Citation
JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.677, pp.250 - 258
Abstract
Rapid and accurate detection and visualization of temperature variations near the human body hold significant importance. This study presents thermochromic colloids capable of adjusting the detectable temperature range and reflection wavelength over a wide spectrum. The systematic investigation focuses on understanding the influence of the molecular structure of nematic mesogens on the morphological dynamics of cholesteric liquid crystal droplets and their associated thermochromic behaviors. A tunable colorimetric temperature range (i.e., from 10 to 40 degrees C) and high sensitivity (i.e., Delta lambda Delta T-1> 100nm C-degrees(-1)) are realized through precise modulation of the alkyl chain lengths in cyanobiphenyls molecules, combined with a cholesteryl oleyl carbonate as a chiral dopant. We demonstrate the efficiency of a binary mixture of different mesogens, enabling customized structural colors with desired temperature responses. Finally, inspired by the ability of the octopus to camouflage through the elongation or contraction of its pigment cells, thermochromic droplets are embedded within a polymer matrix, resulting in a portable skin patch that offers quick, reversible, and direct temperature visualization of the human body.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN
0021-9797
Keyword (Author)
ThermochromicEmulsionsNematic mesogensCyano-alkylbiphenylCholesteric liquid crystals
Keyword
LIQUID-CRYSTALSREFLECTIONINVERSIONCHIRALITYCOLOR

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