Journal
CHEMICAL PHYSICS LETTERS
Volume 670, Issue -, Pages 11-15Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2016.12.056
Keywords
Electrokinetics; Interfacial slip; Liquid-solid interface; Electric double layer
Funding
- Deutsche Forschungsgemeinschaft DFG [NE 810/10]
- [13300063]
- [16300042]
- Grants-in-Aid for Scientific Research [16J00042] Funding Source: KAKEN
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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. (C) 2016 Elsevier B.V. All rights reserved.
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