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

• Published in: Materials horizons Vol. 9; no. 12; pp. 339 - 347
• Main Authors: Guo, Jing, Wu, Shanshan, Wang, Yilei, Huang, Jinhui, Xie, Hui, Zhou, Shaobing
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 28.11.2022
• Subjects: Actuation; Chemical bonds; Damage; Electrochromism; Humidity; Hydrogels; Light modulation; Light transmittance; Polyampholytes; Saline Solution; Smart materials; Sodium Chloride; Visibility; Windows (apertures)
• ISSN: 2051-6347; 2051-6355
• DOI: 10.1039/d2mh00907b

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 H 2 O, 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. A salt-triggered transparency-switchable polyampholyte hydrogel is engineered as a multifunctional smart window featuring active and facile light modulation ability, on-demand information-provision management capacity, and self-healing capacity.