On analytical theories for conductivity and self-diffusion in concentrated electrolytes - Sorbonne Université
Article Dans Une Revue The Journal of Chemical Physics Année : 2023

On analytical theories for conductivity and self-diffusion in concentrated electrolytes

Résumé

Describing analytically the transport properties of electrolytes, such as their conductivity or the self-diffusion of the ions, has been a central challenge of chemical physics for almost a century. In recent years, this question has regained some interest in light of Stochastic Density Field Theory (SDFT) – an analytical framework that allows the approximate determination of density correlations in fluctuating systems. In spite of the success of this theory to describe dilute electrolytes, its extension to concentrated solutions raises a number of technical difficulties, and requires simplified descriptions of the short-range repulsion between the ions. In this article, we discuss recent approximations that were proposed to compute the conductivity of electrolytes, in particular truncations of Coulomb interactions at short distances. We extend them to another observable (the self-diffusion coefficient of the ions) and compare them to earlier analytical approaches, such as the mean spherical approximation and mode-coupling theory. We show how the treatment of hydrodynamic effects in SDFT can be improved, that the choice of the modified Coulomb interactions significantly affects the determination of the properties of the electrolytes, and that comparison with other theories provides a guide to extend SDFT approaches in this context.
Fichier principal
Vignette du fichier
JCP23-AR-EISC2023-02209.pdf (514.2 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04256058 , version 1 (24-10-2023)

Identifiants

Citer

Olivier Bernard, Marie Jardat, Benjamin Rotenberg, Pierre Illien. On analytical theories for conductivity and self-diffusion in concentrated electrolytes. The Journal of Chemical Physics, 2023, 159 (16), pp.164105. ⟨10.1063/5.0165533⟩. ⟨hal-04256058⟩
26 Consultations
13 Téléchargements

Altmetric

Partager

More