From petal effect to lotus effect: a facile solution immersion process for the fabrication of super-hydrophobic surfaces with controlled adhesion
From petal effect to lotus effect: a facile solution immersion process for the fabrication of super-hydrophobic surfaces with controlled adhesion
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DOI：
10.1039/c3nr34256e
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Sun, Kening
中科院分区：
文献类型：
--
作者：
Cheng, Zhongjun;Du, Ming;Sun, Kening
本文报道了一种基于烷基硫醇与分级结构的Cu(OH)(2)底物反应制备具有可控附着力的超疏水表面的简便方法。该反应可以刻蚀氢氧化铜的微观结构，同时引入低表面能的涂层。通过简单地控制反应时间或硫醇的链长，可以获得具有可控粘附性的超疏水表面，表面与水滴之间的粘附力可以从极低(类似14mN)调整到很高(类似65mN)。粘附性的可调效应归因于硫酸盐反应后表面液滴的不同润湿状态，从而改变了液滴的形貌和微结构尺度。值得注意的是，所制备的表面是耐酸/碱的；酸性和碱性水滴具有与中性水滴相似的接触角和附着力。此外，我们通过我们的表面证明了水滴在基于液滴的微反应器中的应用。我们相信，这些结果将有助于进一步理解润湿态对表面附着力的影响，以及可控附着力超疏水表面的制备原理。
In this paper, a convenient approach based on the reaction between an alkyl thiol and hierarchical structured Cu(OH)(2) substrates is reported for the fabrication of super-hydrophobic surfaces with controlled adhesion. This reaction can etch the Cu(OH)(2) microstructures and simultaneously introduce a coating with low surface energy. By simply controlling the reaction time or the chain length of the thiol, super-hydrophobic surfaces with controlled adhesion can be achieved, and the adhesive force between the surface and the water droplet can be adjusted from extreme low (similar to 14 mu N) to very high (similar to 65 mN). The tunable effect of the adhesion is ascribed to the different wetting states for the droplet on the surface that results from the change of the morphology and microstructure scale after the thiolate reaction. Noticeably, the as-prepared surfaces are acid/alkali-resisting; the acidic and basic water droplets have similar contact angles and adhesive forces to that of the neutral water droplet. Moreover, we demonstrate a proof of water droplet transportation for application in droplet-based microreactors via our surfaces. We believe that the results reported here would be helpful for the further understanding of the effect of wetting states on the surface adhesion and the fabrication principle for a super-hydrophobic surface with controlled adhesion.