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Combined negative dielectrophoresis and phase separation in nondilute suspensions subject to a high-gradient ac electric field

Anil Kumar*, Zhiyong Qiu†, and Andreas Acrivos‡

Boris Khusid§

David Jacqmin∥

  • The Levich Institute, The City College of New York, 140th Street & Convent Avenue, New York, New York 10031, USA

  • New Jersey Institute of Technology, University Heights, Newark, New Jersey 07102, USA

  • NASA Glenn Research Center, Cleveland, Ohio 44135, USA

  • *Electronic address: anil@levdec.engr.ccny.cuny.edu
  • †Electronic address: qiu@lisgi6.engr.ccny.cuny.edu
  • ‡Electronic address: acrivos@scisun.sci.ccny.cuny.edu
  • §Electronic address: khusid@adm.njit.edu
  • ∥Electronic address: fsdavid@tess.lerc.nasa.gov
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Phys. Rev. E 69, 021402 – Published 24 February, 2004

DOI: https://doi.org/10.1103/PhysRevE.69.021402

Abstract

Experiments were conducted on concentrated suspensions of neutrally buoyant particles which exhibit negative dielectrophoresis. We found that, due to interparticle electrical interactions, such suspensions undergo a phase separation when subjected to a high-gradient ac field (∼kV/mm) and form a propagating distinct front between the regions enriched with and depleted of particles. A generalization of our theory for the thermodynamics of the field-induced phase transitions in suspensions of polarized particles [Phys. Rev. E 52, 1669 (1995); 54, 5428 (1996); 60, 3015 (1999)] is proposed for the front propagation, and its predictions are shown to be consistent with the experiments even though the model contains no fitting parameters. The combination of field-induced dielectrophoresis and phase transition provides a method for strongly concentrating particles in prespecified regions of dielectrophoretic devices.

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Outline

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Phys. Rev. E 69, 021402– Published 24 February, 2004
  • Received 26 August 2003

© 2004 American Physical Society

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