Fabrication of robust, damage-tolerant superhydrophobic coatings on naturally micro-grooved wood surfaces
Fabrication of robust, damage-tolerant superhydrophobic coatings on naturally micro-grooved wood surfaces
复制标题
在天然微槽木材表面上制造坚固、耐损伤的超疏水涂层
DOI：
10.1039/c5ra24407b
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, Junliang
中科院分区：
文献类型：
--
作者：
Tu, Kunkun;Wang, Xiaoqing;Liu, Junliang
对于具有本质上不均匀的表面结构的亲水性块体材料而言，实现耐久的非润湿表面是极其具有挑战性的，因为表面突起上的涂层材料可能容易磨损，从而暴露下面的亲水性块体材料并导致非润湿性的损失。本文中，基于两步法在天然微槽木材上制造机械坚固的超疏水表面，即，首先施加透明环氧树脂的底漆涂层以覆盖表面微结构，然后使用二氧化硅/环氧树脂/氟化烷基硅烷（FAS）纳米复合材料构造超疏水膜。所制备的木材超疏水涂层对砂纸磨损、手指擦拭和刀刮等机械损伤表现出显著的耐受性，同时由于其粗糙度再生能力而保持其超疏水性。涂层木材还表现出优异的耐久性，对水喷雾的影响和紫外线（UV）辐射，更重要的是，木材基本上保持其原始的颜色和美学外观，尽管涂层处理，突出了其在各种实际应用中的潜在用途。
Achieving durable non-wetting surfaces is extremely challenging for hydrophilic bulk materials with intrinsically heterogeneous surface structures, since the coating materials on the surface protrusions could be easily worn out, thereby exposing the underlying hydrophilic bulk materials and leading to loss of non-wettability. Herein, mechanically robust superhydrophobic surfaces were fabricated on naturally micro-grooved wood based on a two-step process, i.e., first applying a primer coating of transparent epoxy resin to cover the surface microstructures, followed by construction of superhydrophobic films using silica/epoxy resin/fluorinated alkylsilane (FAS) nanocomposites. The as-prepared superhydrophobic coatings on wood showed remarkable tolerance against mechanical damages including sandpaper abrasion, finger-wiping and knife-scratching while retaining their superhydrophobicity owing to their roughness-regenerating capability. The coated wood also exhibited excellent durability against water spray impact and ultraviolet (UV) radiation, and more importantly the wood essentially retained its original color and aesthetic appearance despite the coating treatment, highlighting its potential use in various practical applications.