On the molecular correlations that result in field-dependent conductivities in electrolyte solutions - Sorbonne Université
Journal Articles The Journal of Chemical Physics Year : 2021

On the molecular correlations that result in field-dependent conductivities in electrolyte solutions

Abstract

Employing recent advances in response theory and nonequilibrium ensemble reweighting, we study the dynamic and static correlations that give rise to an electric field-dependent ionic conductivity in electrolyte solutions. We consider solutions modeled with both implicit and explicit solvents, with different dielectric properties, and at multiple concentrations. Implicit solvent models at low concentrations and small dielectric constants exhibit strongly field-dependent conductivities. We compared these results to the Onsager-Wilson theory of the Wien effect, which provides a qualitatively consistent prediction at low concentrations and high static dielectric constants, but is inconsistent away from these regimes. The origin of the discrepancy is found to be increased ion correlations under these conditions. Explicit solvent effects act to suppress nonlinear responses, yielding a weakly field-dependent conductivity over the range of physically realizable field strengths. By decomposing the relevant time correlation functions, we find that the insensitivity of the conductivity to the field results from the persistent frictional forces on the ions from the solvent. Our findings illustrate the utility of nonequilibrium response theory in rationalizing nonlinear transport behavior.
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Dates and versions

hal-03289900 , version 1 (19-07-2021)

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Dominika Lesnicki, Chloe y Gao, David T Limmer, Benjamin Rotenberg. On the molecular correlations that result in field-dependent conductivities in electrolyte solutions. The Journal of Chemical Physics, 2021, 155 (1), pp.014507. ⟨10.1063/5.0052860⟩. ⟨hal-03289900⟩
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