Affiliation:
1. Department of Chemical and Biomolecular Engineering University of California Berkeley California USA
2. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California USA
Abstract
AbstractModeling of electrokinetic flows is crucial to understand numerous phenomena associated with electrochemistry, biophysics, and colloidal science. Here, we incorporate the modified Gaussian renormalized fluctuation theory into transport equations for electrolyte solutions to study the ion‐correlation‐induced inversion of electrokinetic flows, also known as charge inversion. We are able to capture the non‐monotonic dependence of inverted streaming current and reversed electrophoretic mobility on salt concentration. By analyzing the double‐layer structure, we elucidate that this non‐monotonicity is a consequence of the competition between spatially varying ion correlations and the translational entropy of the ions. We find that for practical values of surface charge densities, the excluded volume effect does not play any significant role. In a significant improvement over existing theories, our theoretical predictions are in quantitative agreement with experimental measurements for charge inversion in trivalent salts.
Funder
American Chemical Society Petroleum Research Fund
Subject
General Chemical Engineering,Environmental Engineering,Biotechnology
Cited by
1 articles.
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