Combined field-induced dielectrophoresis and phase separation for manipulating particles in microfluidics
2003; American Institute of Physics; Volume: 83; Issue: 23 Linguagem: Inglês
10.1063/1.1629789
ISSN1520-8842
AutoresDawn J. Bennett, Boris Khusid, Conrad D. James, Paul C. Galambos, Murat Okandan, David Jacqmin, Andreas Acrivos,
Tópico(s)Electrostatics and Colloid Interactions
ResumoExperiments were conducted in microfluidics equipped with dielectrophoretic gates arranged perpendicular to the flow. Under the action of a high-gradient ac field and shear, flowing suspensions were found to undergo a phase separation and to form a distinct front between the regions enriched with and depleted of particles. We demonstrate that this many-body phenomenon, which originates from interparticle electrical interactions, provides a method for concentrating particles in focused regions and for separating biological and nonbiological materials. The evolution of the particle patterns formation is well described by a proposed electrohydrodynamic model.
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