Coupling electrokinetics and rheology: Electrophoresis in non-Newtonian fluids

Aditya S. Khair, Denise E. Posluszny, Lynn M. Walker

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

We present a theoretical scheme to calculate the electrophoretic motion of charged colloidal particles immersed in complex (non-Newtonian) fluids possessing shear-rate-dependent viscosities. We demonstrate that this non-Newtonian rheology leads to an explicit shape and size dependence of the electrophoretic velocity of a uniformly charged particle in the thin-Debye-layer regime, in contrast to electrophoresis in Newtonian fluids. This dependence is caused by non-Newtonian stresses in the bulk (electroneutral) fluid outside the Debye layer, whose magnitude is naturally characterized in an electrophoretic Deborah number.

Original languageEnglish (US)
Article number016320
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume85
Issue number1
DOIs
StatePublished - Jan 25 2012
Externally publishedYes

Fingerprint

Dive into the research topics of 'Coupling electrokinetics and rheology: Electrophoresis in non-Newtonian fluids'. Together they form a unique fingerprint.

Cite this