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    Super-robust self-healing superhydrophobic coating with triboelectrification induced liquid self-repellency

    Year: 2021

    Journal: Mater. Des., Volume 211, DEC 1

    Authors: Zhou, Hua; Wang, Hongxia; Shao, Hao; Lin, Tong; Xu, Hongxing; Niu, Haitao

    Organizations: natural fund of Shandong Province [ZR2020ME062]; Jiangsu New Vison Advanced Functional Fiber Innovation Center; Australian Research Council [DP ARC DP190100306]; State Key Laboratory for Biofibers and Eco-textiles of Qingdao University

    Keywords: Superhydrophobic coating; Super-robust; Self-healing; Triboelectrification; Self-repellency

    Superhydrophobic surfaces integrated with liquid self-repelling property have great application potential, nevertheless, it remains a major challenge for simultaneously achieving super-robust feature and extreme superhydrophobicity. In this work, a super-robust self-healing superhydrophobic coating containing cyclic olefin copolymer (COC), fluorinated alkyl silane (FAS) and polytetrafluoroethylene (PTFE) nanoparticles, is prepared by a convenient one-step wet-chemical coating method. The treated fabric has water contact angle of 168 = and sliding angle of 3 =. The coating demonstrates excellent endurance to various severe damages, e.g., repeated washing, abrasion, boiling water, strong UV irradiation, extremely high and low temperature. It also shows self-healing capability from physical/chemcial damages. Benefitting from the triboelectric negative features of COC and PTFE, this coating shows triboelectrification induced water self-repellence after rubbing with a polyamide (Nylon) fabric, water droplets can jump/move off the tribo-charged area. Moreover, this self-repelling feature works with many different aqueous liquids, such as NaCl, strong acid and alkali. Such a robust superhydrophobic coating can be applied onto many other substrates, such as cotton fabric, glass and cotton, and the treated substrates also exhibited liquid self-repellent properties after rubbing with a Nylon fabric. This triboelectrification enhanced superhydrophobic coating might shed light on developing energy-efficient liquid self removing surfaces for various applications. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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