Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin, Heilongjiang 150090, P R China.
Nanoscale. 2013 Apr 7;5(7):2776-83. doi: 10.1039/c3nr34256e.
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 (∼14 μN) to very high (∼65 μN). 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.
本文报道了一种基于巯基与分级结构 Cu(OH)2 基底反应的简便方法，用于制备具有可控附着力的超疏水表面。该反应可以刻蚀 Cu(OH)2 微结构，同时引入低表面能涂层。通过简单控制反应时间或硫醇的链长，可以得到具有可控附着力的超疏水表面，并且可以调节表面与水滴之间的附着力，从极低（约 14 μN）到非常高（约 65 μN）。附着力的可调性归因于由于巯基反应后形貌和微观结构尺度的变化，液滴在表面上的润湿状态不同。值得注意的是，所制备的表面具有耐酸碱性能；酸性和碱性水滴与中性水滴具有相似的接触角和附着力。此外，我们通过我们的表面展示了用于在基于液滴的微反应器中进行液滴传输的应用的证明。我们相信，这里报道的结果将有助于进一步理解润湿状态对表面附着力的影响以及具有可控附着力的超疏水表面的制造原理。
