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Condensed Matter > Soft Condensed Matter
Title: Anti-Coulomb interaction between charges in a dielectric medium
(Submitted on 3 Apr 2024)
Abstract: The free energy of ion solvation can be decomposed into enthalpic and entropic contributions. This helps to understand the connection between the dielectric properties and the underlying forces. We present a simple linear-response model of screened charge interactions that provides an alternative understanding of solvation barriers. Moreover, it explains the ``anti-Coulomb'' interactions (attraction between like-charged ions and repulsion between opposite-charged ions) observed in both simulations and experiments. We show that this is a universal behavior associated to the non-local response function of any dielectric or metallic system.
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