Nonlinear electro-osmosis of dilute non-adsorbing polymer solutions with low ionic strength

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Nonlinear electro-osmotic behaviour of dilute non-adsorbing polymer solutions with low salinity is investigated using Brownian dynamics simulations and a kinetic theory. In the Brownian simulations, the hydrodynamic interaction between the polymers and a no-slip wall is considered using the Rotne-Prager approximation of the Blake tensor. In a plug flow under a sufficiently strong applied electric field, the polymer migrates toward the bulk, forming a depletion layer thicker than the equilibrium one. Consequently, the electro-osmotic mobility increases nonlinearly with increasing electric field and becomes saturated. This nonlinear mobility does not depend qualitatively on the details of the rheological properties of the polymer solution. Analytical calculations using the kinetic theory for the same system quantitatively reproduce the results of the Brownian dynamics simulation well.

Original languageEnglish
Pages (from-to)7402-7411
Number of pages10
JournalSoft Matter
Volume11
Issue number37
DOIs
Publication statusPublished - Aug 4 2015

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Electroosmosis
Kinetic theory
osmosis
Polymer solutions
Ionic strength
Polymers
Electric fields
Computer simulation
polymers
kinetic theory
Tensors
Hydrodynamics
electric fields
simulation
plugs
salinity
depletion
slip
hydrodynamics
tensors

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Nonlinear electro-osmosis of dilute non-adsorbing polymer solutions with low ionic strength. / Uematsu, Yuki.

In: Soft Matter, Vol. 11, No. 37, 04.08.2015, p. 7402-7411.

Research output: Contribution to journalArticle

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