Physics of Complex Fluids, Univ. of Twente, MESA+ Institute for Nanotechnology and Institute for Mechanics Processes and Control Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
Adv Colloid Interface Sci. 2010 Dec 15;161(1-2):115-23. doi: 10.1016/j.cis.2009.11.002. Epub 2009 Nov 18.
Electrowetting is arguably the most flexible tool to control and vary the wettability of solid surfaces by an external control parameter. In this article we briefly discuss the physical origin of the electrowetting effect and subsequently present a number of approaches for selected novel applications. Specifically, we will discuss the use of EW as a tool to extract materials properties such as interfacial tensions and elastic properties of drops. We will describe some modifications of the EW equation that apply at finite AC voltage for low conductivity fluids when the electric field can partially penetrate into the drops. We will discuss two examples where finite conductivity effects have important consequences, namely electrowetting of topographically structured surfaces as well as the generation of drops in AC electric fields. Finally, we review recent attempts to incorporate electrowetting into conventional channel-based microfluidic devices in order to enhance the flexibility of controlling the generation of drops.
电润湿可以说是控制和改变固体表面润湿性的最灵活的工具，通过外部控制参数。在本文中，我们简要讨论了电润湿效应的物理起源，随后介绍了一些针对选定的新型应用的方法。具体来说，我们将讨论将 EW 用作一种工具来提取材料特性，例如界面张力和液滴的弹性特性。我们将描述在有限交流电压下适用于低电导率流体的 EW 方程的一些修改，此时电场可以部分渗透到液滴中。我们将讨论两个有限电导率效应有重要后果的例子，即具有形貌结构表面的电润湿以及在交流电场中产生液滴。最后，我们回顾了最近将电润湿纳入传统基于通道的微流控设备中的尝试，以增强控制液滴生成的灵活性。
