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Proceedings Paper

Dielectrophoretic trapping without embedded electrodes
Author(s): Eric B. Cummings; Anup K. Singh
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Paper Abstract

We observe dielectrophoretic effects in mixed electrokinetic and dielectrophoretic flows in uniform arrays of posts. Above a threshold applied electric field, flowing filaments of concentrated and rarefied particles appear in the flow. Above a higher-threshold applied field, zones of highly concentrated, immobilized particles appear. At the lower and higher thresholds, dielectrophoresis apparently begins to dominate diffusion and advection/electrokinesis, respectively. The patterns of filaments and trapped zones depend dramatically on the angle of the array with respect to the mean applied electric field and the shape of the posts in the array.

Paper Details

Date Published: 18 August 2000
PDF: 10 pages
Proc. SPIE 4177, Microfluidic Devices and Systems III, (18 August 2000);
Show Author Affiliations
Eric B. Cummings, Sandia National Labs. (United States)
Anup K. Singh, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 4177:
Microfluidic Devices and Systems III
Carlos H. Mastrangelo; Holger Becker, Editor(s)

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