Issue 12, 2022

A salt-triggered multifunctional smart window derived from a dynamic polyampholyte hydrogel

Abstract

Hydrogel smart windows are promising candidates for the automatic modulation of light transmittance through thermo-, humidity-, and electrochromic mechanisms. However, thermo- and humidity-triggered hydrogel smart windows are usually passively controlled and are not convenient for achieving active actuation; electrochromic windows require complex assembly and energy input. In addition, existing hydrogel smart windows are susceptible to physical damage, which may significantly shorten their working life. Herein, a salt-triggered polyampholyte hydrogel (PAH) is developed as a novel smart window with active and facile actuation as well as self-healing ability. The dynamic ionic bonds in PAH can reversibly disassociate and reform in alternate aqueous sodium chloride solution (NaCl(aq.)) and H2O, accounting for the reversible transparency-shifting and efficient modulation of light transmittance. PAH also enables patterning through precisely localized treatment with NaCl(aq.), which is useful for one-time information input/storage. Information encryption can be further realized by embedding PAH into an inherently transparent hydrogel or pasting it on an information carrier; the visibility of information is in line with the transparency-shifting of PAH. Moreover, the dynamic ionic bonds can endow the PAH-derived hydrogel smart window with self-healing and automatic damage-repairing abilities without sacrificing light modulation. Thus, salt-triggered PAH provides a new idea for designing actively actuating hydrogel smart windows with multifunctionality.

Graphical abstract: A salt-triggered multifunctional smart window derived from a dynamic polyampholyte hydrogel

Supplementary files

Article information

Article type
Communication
Submitted
19 jul 2022
Accepted
21 sep 2022
First published
23 sep 2022

Mater. Horiz., 2022,9, 3039-3047

A salt-triggered multifunctional smart window derived from a dynamic polyampholyte hydrogel

J. Guo, S. Wu, Y. Wang, J. Huang, H. Xie and S. Zhou, Mater. Horiz., 2022, 9, 3039 DOI: 10.1039/D2MH00907B

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