STATIC AND SPONTANEOUS ELECTROWETTING
- 30 May 2005
- journal article
- review article
- Published by World Scientific Pub Co Pte Ltd in Modern Physics Letters B
- Vol. 19 (12), 549-569
- https://doi.org/10.1142/s0217984905008542
Abstract
There has been recent renewed interest in electrocapillary and electrowetting phenomena given its potential for microfluidic actuation and manipulation. Different approaches, in which a variety of electrode configurations have been adopted, however, have dominated the developments in this field. These different approaches have given rise to rich and varied behavior, which has often led to some overlap and confusion in the literature. In this article, we delineate the different observations and elucidate the relationship between these phenomena by re-stressing classical concepts and examining their limitations. Particular emphasis is placed on the distinction between static and spontaneous electrowetting. In the former, a static change in the liquid–solid macroscopic contact angle results when a dielectric film-coated planar plate electrode is employed. In the latter, a spontaneous thin fron-t-running electrowetting film is pulled out ahead of the macroscopic drop with the use of planar parallel line electrodes. This dynamically evolving electrowetting film advances much faster than the macroscopic drop itself and behaves in a self-similar manner analogous to gravity spreading films.Keywords
This publication has 27 references indexed in Scilit:
- Interface Profiles near Three-Phase Contact Lines in Electric FieldsPhysical Review Letters, 2003
- Geometry-Dependent Electrostatics near Contact LinesPhysical Review Letters, 2001
- Electrowetting: a recent outbreakCurrent Opinion in Colloid & Interface Science, 2001
- Dielectrophoretic liquid actuation and nanodroplet formationJournal of Applied Physics, 2001
- Fluid Control in Multichannel Structures by Electrocapillary PressureScience, 2001
- Dynamics of Spontaneous Spreading under Electrowetting ConditionsLangmuir, 2000
- Electrically Induced Changes in Dynamic WettabilityLangmuir, 2000
- Limiting phenomena for the spreading of water on polymer films by electrowettingZeitschrift für Physik B Condensed Matter, 1999
- Dynamics of Liquid Spreading on Solid SurfacesIndustrial & Engineering Chemistry Research, 1996
- Flow and instability of a viscous current down a slopeNature, 1982