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Manipulation of bio-particles in microelectrode structures by means of non-uniform ac electric fields

Record type: Conference or Workshop Item (Paper)

In this paper we examine the motion and behavior of particles suspended in aqueous solutions subjected to non-uniform ac electric fields. The particles can move due to forces exerted over them, or due to the motion of the surrounding liquid. In the first case, we have dielectrophoresis, due the action of ac electric fields over polarizable particles. The high strength electric fields 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; 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 gives a steady fluid motion known as ac electroosmosis. We also discuss the effects of Brownian motion in this context. We calculate the different forces and displacements and compare them for a simple system consisting of a saline solution subjected to a traveling wave electric field. This example provides scaling laws of a wider applicability.

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Citation

Castellanos, Antonio, González, Antonio, Ramos, Antonio, Green, Nicolas G and Morgan, Hywel (2002) Manipulation of bio-particles in microelectrode structures by means of non-uniform ac electric fields At ASME 2002 International Mechanical Engineering Congress and Exposition. 17 - 22 Nov 2002. , pp. 165-170. (doi:10.1115/IMECE2002-39617).

More information

Published date: 2002
Venue - Dates: ASME 2002 International Mechanical Engineering Congress and Exposition, 2002-11-17 - 2002-11-22
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 266525
URI: http://eprints.soton.ac.uk/id/eprint/266525
ISBN: 0-7918-3640-1
PURE UUID: 234e8fcd-7d11-427f-b781-d51a38482be6
ORCID for Nicolas G Green: ORCID iD orcid.org/0000-0001-9230-4455
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 05 Aug 2008 22:49
Last modified: 18 Jul 2017 07:15

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Contributors

Author: Antonio Castellanos
Author: Antonio González
Author: Antonio Ramos
Author: Nicolas G Green ORCID iD
Author: Hywel Morgan ORCID iD

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