Dielectrowetting Driven Spreading of Droplets

Glen McHale, Carl Brown, Michael Newton, Gary Wells, Naresh Sampara

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)
3 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)186101-186105
JournalPhysical Review Letters
Volume107
Issue number18
DOIs
Publication statusPublished - 2011

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