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首页> 外文期刊>Advanced Functional Materials >Electrowetting-Induced Stiction Switch of a Microstructured Wire Surface for Unidirectional Droplet and Bubble Motion
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Electrowetting-Induced Stiction Switch of a Microstructured Wire Surface for Unidirectional Droplet and Bubble Motion

机译：用于单向液滴和气泡运动的微结构线表面的电润湿诱导静摩擦开关

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摘要

Directional motion of fluid droplets is attracting considerable research attention. Despite much progress in this field, electrowetting-based stiction switch that drives unidirectional transport of an underwater oil droplet or air bubble on a wire surface is still a challenge to realize. Here, a strategy to collect and unidirectionally transport an underwater oil droplet or air bubble on a porous polystyrene (PS) film-coated copper wire surface through the combination of electrowetting-induced stiction switch and buoyancy is demonstrated. The porous PS film-coated copper wire fabricated by the breath figure method at a relative humidity of 75% can catch and hold an underwater oil droplet or air bubble without applied voltage. With increasing applied voltage, the stiction of the underwater oil droplet or air bubble on the porous PS film surface weakens because water increasingly wets the film surface. The underwater oil droplet or air bubble can move unidirectionally on the porous PS film-coated wire surface upward or downward at a voltage larger than its critical voltage according to whether its density is lower or higher than that of water. This work should aid the development of devices displaying electrowetting-based changes for use in fluid collection, manipulation, unidirectional transfer, release, and removal.
机译：液滴的定向运动引起了相当大的研究关注。尽管在该领域取得了很大进展，但基于电润湿的静摩擦开关驱动单线传输水下油滴或气泡在金属丝表面上仍然是一个挑战。在此，通过电润湿诱导的静力转换和浮力的结合，展示了一种策略来收集并单向传输在多孔聚苯乙烯（PS）薄膜涂层的铜线表面上的水下油滴或气泡。通过呼吸图法在相对湿度为75％的条件下制备的涂有多孔PS膜的铜线可以在不施加电压的情况下捕获并保持水下的油滴或气泡。随着施加电压的增加，由于水越来越多地润湿膜表面，水下油滴或气泡在多孔PS膜表面上的附着力减弱。水下油滴或气泡可以根据其密度是低于还是高于水的密度，在大于其临界电压的电压下在多孔PS膜涂覆的导线表面上单向或向下移动。这项工作应有助于开发显示基于电润湿的变化的设备，以用于流体收集，操纵，单向转移，释放和清除。

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