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Electrowetting: A versatile tool for drop manipulation, generation, and characterization
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DOI：10.1016/j.cis.2009.11.002.png)
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摘要
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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. (C) 2009 Elsevier B.V. All rights reserved.
Keyword:
Microfluidics
Electrowetting
Two-phase flow
Drop generation
Wetting
Interfacial tension
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