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    Rewritable superhydrophobic coatings fabricated using water-soluble polyvinyl alcohol

    Year: 2020

    Journal: Mater. Des., Volume 196, NOV

    Authors: Gong, Xiao; Zhang, Ligui; He, Shuang; Jiang, Shaohua; Wang, Wufeng; Wu, Yongzhong

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21774098]; Open Foundation of the State Key Laboratory of Silicate Materials for Architectures at WUT [SYSJJ2018-04]; Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University)Sichuan University [sklpme2019-4-26]; Foundation of Zhongshan Institute of Advanced Engineering Technology of WUT [WUT201807, 2016F2FC0008]

    Keywords: Spray-coating; Fluorine-free; Superhydrophobic; Self-cleaning

    Superhydrophobic surface has potential applications in various fields due to its excellent water repellency. In particular, fluorine-free superhydrophobic film has attracted extensive attentions. In this study, an eco-friendly and rewritable superhydrophobic coating is successfully prepared by a simple spray-coating method. Hydrophilic silica nanoparticles are immobilized on a substrate by water-soluble polyvinyl alcohol (PVA), and then the surface is further modified by polydimethylsiloxane (PDMS) to obtain a superhydrophobic coating. The prepared coating has a water contact angle of 160 degrees, and exhibits good stability. Most importantly, when the superhydrophobic coating is no longer needed, it can be removed and the substrate can be reused. The eco-friendly and rewritable superhydrophobic coating should have promising potentials in daily life. (c) 2020 The Authors. Published by Elsevier Ltd.
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