AC Electric-Field-Induced Fluid Flow in Microelectrodes

During the AC electrokinetic manipulation of particles in suspension on microelectrode structures, strong frequency-dependent fluid flow is observed. The fluid movement is predominant at frequencies below the reciprocal charge relaxation time, with a reproducible pattern occurring close to and acros...

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Bibliographic Details
Published in:Journal of colloid and interface science 1999-09, Vol.217 (2), p.420-422
Main Authors: Ramos, Antonio, Morgan, Hywel, Green, Nicolas G, Castellanos, Antonio
Format: Article
Language:English
Subjects:
ac electrokinetics
Chemistry
Electrochemistry
electrode polarization
electrohydrodynamics
electroosmosis
Exact sciences and technology
General and physical chemistry
microelectrode
Miscellaneous (electroosmosis, electrophoresis, electrochromism, electrocrystallization, ...)
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Summary:During the AC electrokinetic manipulation of particles in suspension on microelectrode structures, strong frequency-dependent fluid flow is observed. The fluid movement is predominant at frequencies below the reciprocal charge relaxation time, with a reproducible pattern occurring close to and across the electrode surface. This paper reports measurements of the fluid velocity as a function of frequency and position across the electrode. Evidence is presented indicating that the flow occurs due to electroosmotic stress arising from the interaction of the electric field and the electrical double layer on the electrodes. The electrode polarization plays a significant role in controlling the frequency dependence of the flow.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1999.6346