Anisotropic Sliding of Water Droplets on the Superhydrophobic Surfaces with Anisotropic Groove-Like Micro/Nano Structures
Anisotropic Sliding of Water Droplets on the Superhydrophobic Surfaces with Anisotropic Groove-Like Micro/Nano Structures
复制标题
各向异性凹槽微纳结构超疏水表面水滴的各向异性滑动
DOI：
10.1002/admi.201600641
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发表时间：
2016-12-19
影响因子：
5.4
通讯作者：
Zhong, Minlin
中科院分区：
文献类型：
--
作者：
Long, Jiangyou;Fan, Peixun;Zhong, Minlin
前人的研究发现，水滴在水稻叶片上表现出各向异性的滑动行为，这主要是由各向异性的沟槽状表面微结构引起的。类似的槽状表面微观结构和水滴的各向异性滑动行为也可以在其他一些植物上发现，例如芦苇叶。本文采用飞秒激光微加工技术在铜表面制备仿生沟槽状表面微结构。由于该方法的灵活性，周期性微槽的周期和高度可以精确控制，纳米级的表面粗糙度也可以调节。系统地研究了这些表面形貌对水滴润湿状态和各向异性滑动行为的影响，并进行了理论分析。研究结果表明，各向异性滑动行为主要取决于外部水滴的润湿状态。此外，大量的表面纳米结构对表面水滴的各向异性滑动行为没有好处。
Former studies have found that water droplets on the rice leaves exhibit anisotropic sliding behavior, which is mainly caused by the anisotropic groove-like surface microstructures. Similar groove-like surface microstructures and anisotropic sliding behavior of water droplets can also be found on some other plants, such as the reed leaves. In this paper, biomimetic groove-like surface microstructures are fabricated on copper surfaces by femtosecond laser micromachining. Thanks to the flexibility of this method, the period and height of the periodic micro-grooves can be precisely controlled, and the nanoscale surface roughness can also be regulated. The influences of these surface morphologies on the wetting state and anisotropic sliding behavior of water droplets are studied systematically, and theoretic analyses are also conducted. Our results prove that the anisotropic sliding behavior is mainly decided by the wetting state of external water droplets. Besides, plenty of surface nanostructures have no benefits to the anisotropic sliding behavior of surface water droplets.