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

Yuki Uematsu*, Roland R. Netz, Douwe Jan Bonthuis

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

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.

Originalspracheenglisch
Seiten (von - bis)11-15
Seitenumfang5
FachzeitschriftChemical Physics Letters
Jahrgang670
DOIs
PublikationsstatusVeröffentlicht - 1 Jan 2017
Extern publiziertJa

ASJC Scopus subject areas

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

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