Drop transport between two non-parallel plates via AC electrowetting-driven oscillation
Drop transport between two non-parallel plates via AC electrowetting-driven oscillation
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DOI：
10.1016/j.snb.2013.07.074
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发表时间：
2013-11-01
影响因子：
8.4
通讯作者：
Suh, Yong Kweon
中科院分区：
文献类型：
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作者：
Hong, Jiwoo;Park, Jun Kwon;Suh, Yong Kweon
我们提出了一种使用交流电润湿在一对具有小楔角的非平行电极板内进行液滴传输的简单方法。我们根据频率观察到不同的液滴传输行为。在低频 (10 Hz) 下，通过重复的润湿和反润湿过程，由板包围的液滴快速移向较窄的间隙。然而，在高频 (10 kHz) 下，液滴最初会以小幅度的振荡沿同一方向缓慢移动，然后快速穿透较窄间隙的空间。即使水滴没有接触顶板，静电力也会使水滴变形以形成桥，从而产生类似的水滴运动。我们还证明了一对聚对二甲苯涂层板之间的液滴传输行为相似，与特氟隆和聚对二甲苯涂层表面相比，其接触角更小，接触角滞后更高。我们断言，所提出的方法可以通过使用简单的几何配置和简单的电信号控制来控制液滴的传输。 (C) 2013 Elsevier B.V. 保留所有权利。
We propose a simple transport method of drops inside a pair of non-parallel electrode plates with a small wedge angle by using AC electrowetting. We observe different drop transport behaviors depending on the frequency. At low frequency (10 Hz), a drop bounded by the plates moves quickly toward the narrower gap by the repeated wetting and de-wetting process. At high frequency (10 kHz), however, drops initially move slowly in the same direction with a small-amplitude of oscillation and then quickly penetrate the space at the narrower gap. Even if the drop does not touch the top plate, an electrostatic force can deform the drop to make a bridge, resulting in a similar drop motion. We also demonstrate the similar transport behavior of drops between a pair of parylene-coated plates with a smaller contact angle and a higher contact angle hysteresis than the Teflon and parylene-coated surface. We assert that the proposed method can control the transport of drops by using a simple geometric configuration and a simple electrical signal control. (C) 2013 Elsevier B.V. All rights reserved.