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Electrohydrodynamics and dielectrophoresis in microsystems: scaling laws

Open access
Castellanos, A, Ramos, A, González, A, Green, N G, Morgan, H·2003·Journal of Physics D: Applied Physics

Abstract

The movement and behaviour of particles suspended in aqueous solutions subjected to non-uniform ac electric fields is examined. The ac electric fields induce movement of polarizable particles, a phenomenon known as dielectrophoresis. The high strength electric fields that are often used in separation systems can give rise to fluid motion, which in turn results in a viscous drag on the particle. The electric field generates heat, leading to volume forces in the liquid. Gradients in conductivity and permittivity give rise to electrothermal forces and gradients in mass density to buoyancy. In addition, non-uniform ac electric fields produce forces on the induced charges in the diffuse double layer on the electrodes. This causes a steady fluid motion termed ac electro-osmosis. The effects of Brownian motion are also discussed in this context. The orders of magnitude of the various forces experienced by a particle in a model microelectrode system are estimated. The results are discussed in relation to experiments and the relative influence of each type of force is described.

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Metadata

Authors
Castellanos, A., Ramos, A., González, A., Green, N. G., & Morgan, H.
Venue
Journal of Physics D: Applied Physics
Published
2003-10-01
Volume
36
Issue
20
Pages
2584-2597
ISSN
  • 0022-3727 (ISSN-L)
  • 1361-6463
OpenAlex
W2132731060
Cited by
709
References
17
FWCI
9.74
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Electrohydrodynamics and dielectrophoresis in microsystems: scaling laws. https://app.cochat.ai/papers/10.1088/0022-3727/36/20/023
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Castellanos, A., Ramos, A., González, A., Green, N. G., & Morgan, H. (2003). Electrohydrodynamics and dielectrophoresis in microsystems: scaling laws. Journal of Physics D: Applied Physics. https://doi.org/10.1088/0022-3727/36/20/023

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