A robust and versatile superhydrophobic coating: Wear-resistance study upon sandpaper abrasion
A robust and versatile superhydrophobic coating: Wear-resistance study upon sandpaper abrasion
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DOI：
10.1016/j.apsusc.2019.03.001
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发表时间：
2019-06-30
影响因子：
6.7
通讯作者：
Jing, Xinli
中科院分区：
文献类型：
--
作者：
Li, Meng;Li, Yu;Jing, Xinli
机械耐久性特别是耐磨性严重限制了超疏水表面的实际应用。为了提高超疏水表面的机械耐久性，人们付出了很多努力。然而，由于缺乏标准的评价标准，仅通过比较超疏水表面在失去超疏水性之前所能承受的磨损周期或距离来评价超疏水表面的机械耐久性是不准确的。本文基于典型的树脂-疏水填料配方评估了超疏水表面对砂纸磨损的耐磨性。通过考虑疏水填料的尺寸，仔细研究了所制备的超疏水表面的机械强度、摩擦系数以及超疏水性随着磨损周期的增长而演变。尽管从纳米级颗粒到微米级团簇的疏水性填料在一定含量下都可以实现超疏水表面，但填料尺寸越大，耐磨性越好。对于具有给定表面粗糙度的超疏水涂层，当与比涂层本身更粗糙的物体摩擦时，其超疏水性可以保留。此外，还针对聚合物溶液评估了所开发的超疏水表面的减阻性能。这项工作将为建立超疏水涂层耐磨性评价标准提供有用的线索。
The mechanical durability, especially wear-resistance seriously restricts the practical application of superhydrophobic surfaces. Lots of efforts have been put to improve the mechanical durability of superhydrophobic surfaces. However, due to the lack of a standard evaluation criterion, it is inaccurate to evaluate the mechanical durability of superhydrophobic surfaces by merely comparing the abrasion cycles or distance it can stand before losing superhydrophobicity. In this paper, the wear-resistance of superhydrophobic surfaces against sandpaper abrasion was evaluated based on a typical resin-hydrophobic filler formula. The mechanical strength, coefficient of friction and evolution of superhydrophobicity with growing abrasion cycles of as-prepared superhydrophobic surfaces were carefully studied by considering the hydrophobic filler sizes. In spite that superhydrophobic surfaces can all be achieved with hydrophobic fillers from nano-meter scale particles to micro-meter scale clusters at a certain content, the larger the filler size, the better the wear-resistance. For superhydrophobic coatings with a given surface roughness, its superhydrophobicity can be preserved when abraded against items which were rougher than coating itself. Furthermore, drag reduction performance of the developed superhydrophobic surfaces was evaluated against the polymer solution. This work will provide useful clues for establishing the standard to evaluate the wear-resistance of superhydrophobic coatings.