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光响应固体表面的浸润性调控
Photoresponsive Surfaces with Controllable Wettability
物质表面能和表面微观结构是影响物质浸润性的两大主要因素,表面能决定了平滑表面的液体接触角,而表面微观结构影响表面的浸润性。在受到外界刺激时,物质表面可发生表面能和表面微观结构的变化,从而实现表面浸润性的变化。本文综述了近年来物质表面的浸润性在光刺激下发生转变的研究进展,其中包括无机氧化物表面超疏水和超亲水之间的转换,光响应聚合物表面液滴的运动及接触角的变化,以及光响应聚合物表面黏附性的变化。
Surface energy and surface topography are two key factors in the wettability of solid substrates. The surface energy determines the contact angle (CA) of a liquid on a flat substrate and the geometrical factor enhances the wetting property for a hydrophilic surface (or non-wetting for a hydrophobic surface). Applying external stimuli is a valuable approach for rendering the change in surface chemistry and/or topography, and for driving the wettability transition of smart surfaces. This review describes the current state-of-the-art research on the reversibly switchable wettability of surface brought about by external stimuli, including surface conversion between superhydrophobicity and superhydrophilicity prepared from inorganic oxides or/and photoactive organic molecules, movement of liquid droplets driven by molecular machines, and light-driven switching of superhydrophobic adhesion.
Contents
1 Introduction
1.1 Basic theory of surface wettability
1.2 Photoresponsive materials
2 Inorganic-oxide-based photoresponsive surfaces
3 Organic-compound-based photoresponsive surfaces
3.1 Non-azobenzene compound photoresponsive surfaces
3.2 Azobenzene compound photoresponsive surfaces
4 Conclusion
wetting property
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