Electrowetting droplet microfluidics on a single planar surface
Electrowetting droplet microfluidics on a single planar surface
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DOI：
10.1007/s10404-006-0085-8
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发表时间：
2006-09-01
影响因子：
2.8
通讯作者：
Sterling, James D.
中科院分区：
文献类型：
--
作者：
Cooney, Christopher G.;Chen, Chao-Yi;Sterling, James D.
电润湿是指在静电作用下使表面上的导电液滴的接触角减小。大多数设计要么将液滴夹在顶部有接地板，要么将一根电线插入液滴。Washizu和其他人已经开发出能够在没有顶板的情况下产生液滴运动的系统，同时允许液滴潜力漂浮。与这些设计不同的是，我们演示了一种电润湿系统，在该系统中，液滴可以使用介电层顶部的细导线从下面接地。这种替代的液滴电气接地方法，我们称之为自下而上接地，无需顶板或导线即可实现更坚固的液滴平移。我们提供了简明的电能分析，准确地描述了接地和非接地设计之间的区别，液滴运动的改进，以及与自下而上接地设计相关的简化控制策略。在单一平面上的电润湿提供了与液体处理仪器对接的灵活性，利用液滴惯性动力学实现了两个液滴在合并时的增强混合，并提高了液滴的平移速度。在本文中，我们介绍了与自下而上接地方法相关的实验结果和一些设计问题。
Electrowetting refers to an electrostatically induced reduction in the contact angle of an electrically conductive liquid droplet on a surface. Most designs ground the droplet by either sandwiching the droplet with a grounding plate on top or by inserting a wire into the droplet. Washizu and others have developed systems capable of generating droplet motion without a top plate while allowing the droplet potential to float. In contrast to these designs, we demonstrate an electrowetting system in which the droplet can be electrically grounded from below using thin conductive lines on top of the dielectric layer. This alternative method of electrically grounding the droplet, which we refer to as grounding-from-below, enables more robust droplet translation without requiring a top plate or wire. We present a concise electrical-energy analysis that accurately describes the distinction between grounded and nongrounded designs, the improvements in droplet motion, and the simplified control strategy associated with grounding-from-below; designs. Electrowetting on a single planar surface offers flexibility for interfacing to liquid-handling instruments, utilizing droplet inertial dynamics to achieve enhanced mixing of two droplets upon coalescence, and increasing droplet translation speeds. In this paper, we present experimental results and a number of design issues associated with the grounding-from-below, approach.