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Large-scale fabrication of decoupling coatings with promising robustness and superhydrophobicity for antifouling, drag reduction, and organic photodegradation
Friction ( IF 6.8 ) Pub Date : 2023-01-06 , DOI: 10.1007/s40544-022-0652-3
Lei Xin, Hao Li, Jian Gao, Zhongwei Wang, KaiJie Zhou, Sirong Yu

It is still a challenge to achieve large-area preparation of robust superhydrophobic surfaces with strong mechanical stability. Here, a simple and low-cost method to prepare robust decoupling superhydrophobic coatings on aluminum (Al) alloys substrate has been presented. The superhydrophobicity and robustness of decoupling coatings are realized by structuring surfaces at two different length scales, with nanostructures for superhydrophobicity and microstructures for robustness. This prepared decoupling coating shows promising superhydrophobicity, with water contact angle (CA) of ∼158.4° and roll off angle (RA) of ∼3°. It also exhibits high repellency for impacting water droplets. Notably, the decoupling coating processes outstanding adhesion strength on the substrate after tape-peeling and cross-cut tests, also with promising wear resistantance after sandpaper abrasion and wear test. The friction coefficient of this decoupling coating is only ∼0.2. In addition, the robust decoupling superhydrophobic coating is applied to underwater buoyancy enhancement and fluid resistance reduction (drag reduction rate ∼30.09%). This decoupling superhydrophobic coating also displays promising self-cleaning and antifouling properties. Moreover, benefitting from the photocatalytic property of TiO2, this decoupling coating is also exploited for degrading organics to achieve seawater purification. This obtained decoupling superhydrophobic coating is expected to apply on other solids in marine fields, and the simple and eco-friendly method develops the potential practical application.



中文翻译:

大规模制备具有良好稳健性和超疏水性的​​去耦涂层,用于防污、减阻和有机光降解

实现大面积制备具有强机械稳定性的坚固超疏水表面仍然是一个挑战。在这里,提出了一种在铝 (Al) 合金基板上制备坚固的去耦超疏水涂层的简单且低成本的方法。去耦涂层的超疏水性和坚固性是通过在两个不同长度尺度上结构化表面来实现的,纳米结构用于超疏水性,微结构用于坚固性。这种制备的去耦涂层显示出良好的超疏水性,水接触角(CA)为~158.4°,滚动角(RA)为~3°。它还对冲击水滴表现出高排斥性。值得注意的是,去耦涂层在胶带剥离和划格测试后在基材上具有出色的附着力,经过砂纸磨耗和磨耗试验,也具有良好的耐磨性。这种去耦涂层的摩擦系数仅为~0.2。此外,坚固的解耦超疏水涂层应用于水下浮力增强和流体阻力降低(减阻率~30.09%)。这种去耦超疏水涂层还显示出有前途的自清洁和防污性能。此外,得益于 TiO2 的光催化特性2,这种去耦涂层还被用于降解有机物以实现海水净化。所获得的解耦超疏水涂层有望应用于海洋领域的其他固体,其简单环保的方法具有潜在的实际应用价值。

更新日期:2023-01-07
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