Towards Large-Scale Fabrication of Self-Healable Functional Hydrogel Coatings for Anti-Fog/Frost Surfaces and Flexible Sensors,Advanced Materials Technologies

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Towards Large-Scale Fabrication of Self-Healable Functional Hydrogel Coatings for Anti-Fog/Frost Surfaces and Flexible Sensors
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2021-05-13 , DOI: 10.1002/admt.202001267
Yonggan Yan ₁ , Jiuyu Cui ₁ , Xiaoyong Qiu ₂ , Hanlian Liu ₁ , Xiang Liu ₁ , Peng Yao ₁ , Jun Huang _{1,

3,

4} , Xin Cui ₅ , Xiubing Liang ₅ , Chuanzhen Huang ₁

Affiliation

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 (≈0.1–0.2 s) from long-time press (≈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.

中文翻译：

用于防雾/霜表面和柔性传感器的自修复功能水凝胶涂层的大规模制造

水凝胶涂层因其在开发先进柔性设备方面的巨大潜力而引起了广泛的研究兴趣。然而，它们中的大多数不能满足在各种基材上大规模应用的要求，并且在恶劣的条件下会失去其功能。在这项工作中，通过直接涂漆和紫外线固化含有丙烯酰胺 (AM)、支化聚乙烯亚胺 (PEI)、CaCl _{2 的}混合水凝胶前体，开发了一种大规模且表面独立的多功能水凝胶涂层。，和甘油。由于水凝胶的亲水性和抗冻性，这种涂层显示出优异的防雾和防霜性能。此外，由于凝胶网络中聚合物链之间存在动态氢键，水凝胶涂层在宏观和微观尺度上都具有出色的自修复性能。此外，由于凝胶网络中存在可移动的离子，这种水凝胶涂层还表现出导电性。通过将水凝胶涂层图案化到弹性基材上，制造了一种可折叠的胶带传感器，可以灵敏地区分短时间点击（≈0.1–0.2 s）和长时间按压（≈1–2 s），并检测对应于循环的电信号弯曲变形。这项工作为工程应用提供了水凝胶涂层的实际演示，其中防雾、

更新日期：2021-07-05

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