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Appl. Phys. Lett. 97, 093702 (2010); http://dx.doi.org/10.1063/1.3483129 (3 pages)

Experimental validation of the theory of wall effect on dielectrophoresis

Y. J. Lo and U. Lei

Institute of Applied Mechanics, National Taiwan University, Taipei 10617, Taiwan

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(Received 27 May 2010; accepted 4 August 2010; published online 30 August 2010)

Many dielectrophoretic manipulations of particles are performed near walls. The theory of wall effect on dielectrophoresis was recently reported but not experimentally validated. Two experiments with polystyrene particles in deionized water were performed. The dielectrophoretic force normal to an insulated wall is validated by balancing it with buoyancy in an inclined rectangular channel subject to a uniform electric field. The dielectrophoretic force parallel to the wall is validated by balancing it with fluid drag in a diverging channel subject to a radial field. The measurements agree with theory within 7.4% and 8.1% discrepancies, for the normal and parallel forces, respectively.

© 2010 American Institute of Physics

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KEYWORDS and PACS

PACS

  • 82.45.-h

    Electrochemistry and electrophoresis

  • 47.65.-d

    Magnetohydrodynamics and electrohydrodynamics

  • 47.60.Dx

    Flows in ducts and channels

  • 47.50.-d

    Non-Newtonian fluid flows

ARTICLE DATA

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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