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

Yuki Uematsu, Roland R. Netz, Douwe Jan Bonthuis

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 - Jan 1 2017

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Power-law electrokinetic behavior as a direct probe of effective surface viscosity'. Together they form a unique fingerprint.

  • Cite this