Europhys. Lett.
Volume 74, Number 4, May 2006
Page(s) 623 - 629
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 12 April 2006
Europhys. Lett., 74 (4), pp. 623-629 (2006)
DOI: 10.1209/epl/i2005-10569-0

Control of electrostatic particle-particle interactions in dielectrophoresis

N. Aubry and P. Singh

Department of Mechanical Engineering, New Jersey Institute of Technology University Heights, Newark, NJ 07102, USA

received 27 June 2005; accepted in final form 16 March 2006
published online 12 April 2006

In a nonuniform electric field, the particles of a suspension experience both a dielectrophoretic (DEP) force and electrostatic particle-particle forces. In applications which require that the particles be manipulated individually the latter forces are not desirable. It is shown numerically that the ratio of the particle-particle and DEP forces decreases with increasing particle size and increasing gap between the particles, and its variation with the Clausius-Mossotti factor becomes increasingly nonlinear with decreasing particle size.

41.20.Cv - Electrostatics; Poisson and Laplace equations, boundary-value problems.
47.61.Fg - Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS).

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