期刊
ADVANCED MATERIALS TECHNOLOGIES
卷 6, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/admt.202001267
关键词
anti‐ fog; anti‐ frost; flexible sensor; functional hydrogel coating; self‐ healing
资金
- National Natural Science Foundation of China [51905305, 21902183]
- Natural Science Foundation of Shandong Province [ZR2019ZD36, ZR2020YQ38]
- Open Foundation of Advanced Medical Research Institute of Shandong University [22480089398408]
- Open Foundation of State Key Laboratory of Mineral Processing [BGRIMM-KJSKL-2020-10]
- Natural Science Foundation of Beijing Municipality [2204103]
A large-scale and surface-independent multifunctional hydrogel coating has been developed, showing superior anti-fog, anti-frosting, self-healing, and electrically conductive properties. By patterning the coating onto an elastic substrate, a foldable tape sensor has been fabricated, capable of distinguishing different lengths of operations and detecting electrical signals corresponding to cyclic bending deformation.
Hydrogel coatings have drawn substantial research interest owing to their great potential in developing advanced flexible devices. However, most of them cannot meet the requirement of large-scale application on diverse substrates and would lose their functionalities under harsh conditions. In this work, a large-scale and surface-independent multifunctional hydrogel coating is developed by directly painting and ultraviolet curing hybrid hydrogel precursor containing acrylamide (AM), branched polyethylenimine (PEI), CaCl2, and glycerol. Such a coating shows superior anti-fog and anti-frost properties owing to the hydrophilic nature and freezing-tolerance of the hydrogel. Besides, the hydrogel coating possesses excellent self-healing performance at both macro- and micro- scales because of the dynamic hydrogen bonds prevailing between the polymer chains in a gel network. Moreover, this hydrogel coating also exhibits electric conductivity due to the mobile ions present in the gel network. By patterning the hydrogel coating onto an elastic substrate, a foldable tape sensor is fabricated which can sensitively distinguish short-time click (approximate to 0.1-0.2 s) from long-time press (approximate to 1-2 s) and detect electrical signals corresponding to cyclic bending deformation. This work provides practical demonstration of hydrogel coatings for engineering applications where anti-fog, anti-frosting, self-healing, and electrically conductive properties are needed.
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