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Double-layer polarization of a non-conducting particle in an alternating current field with applications to dielectrophoresis†
Article first published online: 8 AUG 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Special Issue: Dielectrophoresis 2011 – Part I
Volume 32, Issue 17, pages 2232–2244, September 2011
How to Cite
Zhao, H. (2011), Double-layer polarization of a non-conducting particle in an alternating current field with applications to dielectrophoresis. ELECTROPHORESIS, 32: 2232–2244. doi: 10.1002/elps.201100035
- Issue published online: 25 AUG 2011
- Article first published online: 8 AUG 2011
- Manuscript Accepted: 7 APR 2011
- Manuscript Revised: 23 MAR 2011
- Manuscript Received: 14 JAN 2011
- UNLV URBAN 21 Innovation Grant
- Electric double layer;
Dielectrophoresis is becoming one of the most important techniques in particle manipulation including particle separation, particle assembly, and biomolecule characterization. Understanding dielectrophoretic properties of particles is a key step toward effective and efficient particle manipulation. Theoretical studies of polarization of a particle can help to understand experimental observations and also go beyond to develop a predictive theory to guide the experimental design. This article discusses recent theoretical advances in the polarization of a dielectric particle, in particular, the polarization of the electric double layer. The double-layer polarization is critical to determine particle dynamics in dielectrophoresis. The dipole moment characterizing the strength of this polarization depends on the double-layer thickness, the electric field frequency, the particle's surface charge, and other surface's properties (Pohl, H. A., Dielectrophoresis, Cambridge University Press, New York 1978). After a brief review of the mathematical model, the focus is on the following problems: (i) the polarization of a spherical particle; (ii) the polarization of an elongated cylindrical particle; (iii) the effect of the slip on the polarization of a particle. The double-layer polarization is examined here in the context of high-frequency and low-frequency dispersions induced by surface conduction and diffusion, respectively.