Dielectrowetting Driven Spreading of Droplets

McHale, Glen, Brown, Carl, Newton, Michael, Wells, Gary and Sampara, Naresh (2011) Dielectrowetting Driven Spreading of Droplets. Physical Review Letters, 107 (18). pp. 186101-186105. ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.107.186101

Abstract

The wetting of solid surfaces can be modified by altering the surface free energy balance between the solid, liquid, and vapor phases. Here we show that liquid dielectrophoresis induced by nonuniform electric fields can be used to enhance and control the wetting of dielectric liquids. In the limit of thick droplets, we show theoretically that the cosine of the contact angle follows a simple voltage squared relationship analogous to that found for electrowetting on dielectric. Experimental observations confirm this predicted dielectrowetting behavior and show that the induced wetting is reversible. Our findings provide a noncontact electrical actuation process for meniscus and droplet control.

Item Type: Article
Uncontrolled Keywords: lens, dielectrophoresis, microfluidics, liquids, voltage, films, water
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Ay Okpokam
Date Deposited: 02 Feb 2012 15:34
Last Modified: 10 May 2017 05:34
URI: http://nrl.northumbria.ac.uk/id/eprint/5205

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