Analytical Interfacial Layer Model for the Capacitance and Electrokinetics of Charged Aqueous Interfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Yuki UematsuDouwe Jan Bonthuis

Abstract

We construct an analytical model to account for the influence of the subnanometer-wide interfacial layer on the differential capacitance and the electro-osmotic mobility of solid-electrolyte interfaces. The interfacial layer is incorporated into the Poisson-Boltzmann and Stokes equations using a box model for the dielectric properties, the viscosity, and the ionic potential of mean force. We calculate the differential capacitance and the electro-osmotic mobility as a function of the surface charge density and the salt concentration, both with and without steric interactions between the ions. We compare the results from our theoretical model with experimental data on a variety of systems (graphite and metallic silver for capacitance and titanium oxide and silver iodide for electro-osmotic data). The differential capacitance of silver as a function of salinity and surface charge density is well reproduced by our theory, using either the width of the interfacial layer or the ionic potential of mean force as the only fitting parameter. The differential capacitance of graphite, however, needs an additional carbon capacitance to explain the experimental data. Our theory yields a power-law dependence of the electro-osmotic mobility on...Continue Reading

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Citations

Aug 25, 2018·Physical Chemistry Chemical Physics : PCCP·Majid RezaeiDouwe Jan Bonthuis
Sep 28, 2018·The European Physical Journal. E, Soft Matter·Guilherme V BossaSylvio May
Sep 17, 2018·The Journal of Chemical Physics·Rudolf Podgornik
May 25, 2020·The European Physical Journal. E, Soft Matter·Dipankar Kundu, Somnath Bhattacharyya
May 4, 2021·The Journal of Physical Chemistry. B·Majid RezaeiDouwe Jan Bonthuis
Jul 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Amanuel Wolde-Kidan, Roland R Netz
Jul 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuki Uematsu
Mar 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yuki UematsuRoland R Netz
Sep 24, 2020·ACS Nano·Mohammad H Motevaselian, Narayana R Aluru
Sep 17, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Paramita MahapatraPartha P Gopmandal

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