Nanostructures in superhydrophobic Ti6Al4V hierarchical surfaces control wetting state transitions
Nanostructures in superhydrophobic Ti6Al4V hierarchical surfaces control wetting state transitions
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超疏水 Ti6Al4V 分级表面中的纳米结构控制润湿状态转变
DOI：
10.1039/c5sm00024f
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发表时间：
2015-01-01
期刊：
影响因子：
3.4
通讯作者：
Wang, Tao
中科院分区：
文献类型：
--
作者：
Shen, Yizhou;Tao, Jie;Wang, Tao
本文主要研究了液滴在Ti6 Al 4V微纳米分级结构疏水表面上的润湿状态。在这项工作中，在分级结构的二级纳米结构的润湿状态的转变（从Wenzel态到Cassie态）的详细作用机制被揭示和讨论。利用场发射扫描电子显微镜（FE-SEM）观察了样品表面微观形貌的变化。此外，通过接触角测量仪测量液滴在表面上的表观接触角和滑动角。理论和实验结果表明，利用水热法在微结构表面植入一维纳米线结构，由于其与微结构良好的尺寸协同作用，有效地将液滴在微结构表面的润湿状态从Wenzel态转变为Cassie态。该过程不仅增加了液滴在固体表面上的表观接触角（至161度），而且显著降低了滑动角（至3度）和接触角滞后（至类似于2度），证明了稳健的非润湿性质。
This paper mainly reports the wetting state of liquid droplets on a Ti6Al4V micro-nanoscale hierarchical structured hydrophobic surface. In this work, the detailed action mechanism of the secondary nanostructure in the hierarchical structure on the wetting-state transition (from the Wenzel state to the Cassie state) was revealed and discussed. The variation of micro-morphology of the sample surface was observed using a field emission scanning electron microscope (FE-SEM). Furthermore, the apparent contact angle and sliding angle of the droplets on the surfaces were measured via a contact angle measurement instrument. The theoretical and experimental results indicated that the one-dimensional nanowire structure, which was planted on the microstructure surface by the hydrothermal method, effectively changed the wetting state of liquid droplets on the surface from the Wenzel state to the Cassie state owing to its good size synergies with microscale structure. This process not only increased the apparent contact angle of liquid droplets on the solid surface (to 161 degrees), but also decreased the sliding angle significantly (to 3 degrees) and contact angle hysteresis (to similar to 2 degrees), demonstrating the robust non-wetting property.