Article

AC Electric-Field-Induced Fluid Flow in Microelectrodes

Departamento de Electronica y Electromagnetismo, Universidad de Sevilla, Avda. Reina Mercedes, s/n, 41012, Sevilla, Spain; Bioelectronics Research Centre, Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow, G12 8LT, United Kingdom
Journal of Colloid and Interface Science DOI:10.1006/jcis.1999.6346 pp.420-422

ABSTRACT 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.

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Keywords

AC electrokinetic manipulation
 
electric field
 
electrical double layer
 
electrode
 
electrode polarization
 
electrode surface
 
electrodes
 
electroosmotic stress
 
fluid movement
 
fluid velocity
 
frequencies
 
frequency dependence
 
microelectrode structures
 
paper reports measurements
 
reciprocal charge relaxation time
 
strong frequency-dependent fluid flow