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Electrokinetic instabilities of non-dilute colloidal suspensions

Published online by Cambridge University Press:  25 January 2009

GURU NAVANEETHAM  and
JONATHAN D. POSNER
GURU NAVANEETHAM
Affiliation:
Department of Mechanical Engineering, Arizona State University, Tempe, AZ, USA
JONATHAN D. POSNER*
Affiliation:
Department of Mechanical Engineering, Arizona State University, Tempe, AZ, USA Department of Chemical Engineering, Arizona State University, Tempe, AZ, USA
*
†Email address for correspondence: jposner@asu.edu
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Abstract

An experimental investigation of electrokinetic instabilities (EKIs) of non-dilute colloidal suspensions in microchannels is presented. The addition of charged colloidal particles to a solution can alter the solution's electrical conductivity and permittivity as well as the average particle electrophoretic mobility. In this work, a colloidal (500 nm polystyrene) volume fraction gradient is achieved at the intersection of a Y-shaped polydimethylsiloxane (PDMS) microchannel. The flow becomes unstable when the electroviscous stretching and folding of the conductivity and permittivity interfaces exceed the dissipative effects of viscous forces and particle diffusion. The suspension conductivity as a function of the particle volume fraction is presented. The critical conditions required for flow instability are measured along with a scaling analysis which shows that the flow becomes unstable due to a coupling of applied electric fields and the electrical conductivity and permittivity gradients in the flow. The flow becomes unstable at a critical electric Rayleigh number of Rae = 1.8 × 105 for a wide range of applied electric fields spanning three orders of magnitude and colloid volume fractions varying two orders of magnitude. EKIs of non-dilute colloidal suspensions may be important for applications such as the electrophoretic deposition of micropatterned colloidal assemblies, electrorheological devices and on-chip electrokinetic (EK) manipulation of colloids.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 619 , 25 January 2009 , pp. 331 - 365
Copyright
Copyright © Cambridge University Press 2008

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References

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