Power-law electrokinetic behavior as a direct probe of effective surface viscosity

Yuki Uematsu, Roland R. Netz, Douwe Jan Bonthuis

Research output: Contribution to journalArticleResearchpeer-review

Abstract

An exact solution to the Poisson-Boltzmann and Stokes equations is derived to describe the electric double layer with inhomogeneous dielectric and viscosity profiles in a lateral electric field. In the limit of strongly charged surfaces and low salinity, the electrokinetic flow magnitude follows a power law as a function of the surface charge density. Remarkably, the power-law exponent is determined by the interfacial dielectric constant and viscosity, the latter of which has eluded experimental determination. Our approach provides a novel method to extract the effective interfacial viscosity from standard electrokinetic experiments. We find good agreement between our theory and experimental data.

Original languageEnglish
Pages (from-to)11-15
Number of pages5
JournalChemical Physics Letters
Volume670
DOIs
Publication statusPublished - 1 Jan 2017
Externally publishedYes

Fingerprint

electrokinetics
Viscosity
viscosity
probes
Surface charge
salinity
Charge density
Permittivity
Electric fields
exponents
permittivity
electric fields
profiles
Experiments

Keywords

  • Electric double layer
  • Electrokinetics
  • Interfacial slip
  • Liquid-solid interface

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Power-law electrokinetic behavior as a direct probe of effective surface viscosity. / Uematsu, Yuki; Netz, Roland R.; Bonthuis, Douwe Jan.

In: Chemical Physics Letters, Vol. 670, 01.01.2017, p. 11-15.

Research output: Contribution to journalArticleResearchpeer-review

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AB - An exact solution to the Poisson-Boltzmann and Stokes equations is derived to describe the electric double layer with inhomogeneous dielectric and viscosity profiles in a lateral electric field. In the limit of strongly charged surfaces and low salinity, the electrokinetic flow magnitude follows a power law as a function of the surface charge density. Remarkably, the power-law exponent is determined by the interfacial dielectric constant and viscosity, the latter of which has eluded experimental determination. Our approach provides a novel method to extract the effective interfacial viscosity from standard electrokinetic experiments. We find good agreement between our theory and experimental data.

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