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Assembly of colloidal aggregates by electrohydrodynamic flow: Kinetic experiments and scaling analysis
 

Summary: Assembly of colloidal aggregates by electrohydrodynamic flow: Kinetic experiments
and scaling analysis
W. D. Ristenpart, I. A. Aksay, and D. A. Saville*
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA
Received 7 October 2003; published 27 February 2004
Electric fields generate transverse flows near electrodes that sweep colloidal particles into densely packed
assemblies. We interpret this behavior in terms of electrohydrodynamic motion stemming from distortions of
the field by the particles that alter the body force distribution in the electrode charge polarization layer. A
scaling analysis shows how the action of the applied electric field generates fluid motion that carries particles
toward one another. The resulting fluid velocity is proportional to the square of the applied field and decreases
inversely with frequency. Experimental measurements of the particle aggregation rate accord with the electro-
hydrodynamic theory over a wide range of voltages and frequencies.
DOI: 10.1103/PhysRevE.69.021405 PACS number s : 82.70.Dd, 47.65. a
I. INTRODUCTION
In its traditional form, the electrophoretic deposition of
colloidal particles is analogous to sedimentation 1 . Since
the electric field is a surrogate for gravity, positively
charged particles move in the direction of the applied field.
However, extensive experimentation during the last two de-
cades has shown that particle motion transverse to the ap-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science