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Proceedings Paper

Mechano-thermo-chromic device with supersaturated salt hydrate crystal for next-generation smart window applications
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Paper Abstract

Herein, a new type of smart glass fabricated by using a thermoswtichable salt hydrate with a microheater is reported. The supersaturated sodium hydrate solution is clear and transparent at the liquid, however, it turns solid and opaque state after mechanical impact. The nanomaterial-based transparent micro heater is suitable for flexible applications and it consumes low electrical energy due to its high electrical conductivity and high-efficiency of electrothermal effect. Considering the solubility of the sodium acetate in water and chemical properties such as water of crystallization, a phase transition from the liquid state to solid occurs in few seconds with rapid crystal growth of sodium acetate trihydrate. Therefore, it quickly blocks an intense sunlight and provides privacy protection. In reverse, the phase transition from the solid-state to the liquid is simply controllable within a few minutes by the microheater. Finally, we demonstrate a practical application of mechano-thermo-chromic (MTC) device by constructing a system, which operates by an external environment condition such as intense UV light.

Paper Details

Date Published: 25 February 2020
PDF: 6 pages
Proc. SPIE 11303, Emerging Liquid Crystal Technologies XV, 113030W (25 February 2020); doi: 10.1117/12.2542731
Show Author Affiliations
Jinhyeong Kwon, Korea Institute of Industrial Technology (Korea, Republic of)
Hyunmin Cho, Seoul National Univ. (Korea, Republic of)
Inho Ha, Seoul National Univ. (Korea, Republic of)
Habeom Lee, Pusan National Univ. (Korea, Republic of)
Sukjoon Hong, Hanyang Univ. (Korea, Republic of)
Seung Hwan Ko, Seoul National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 11303:
Emerging Liquid Crystal Technologies XV
Liang-Chy Chien; Dirk J. Broer, Editor(s)

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