Fluctuation-induced ionic friction at solid-electrolyte interfaces

Abstract

In this article, we explore how transport at a solid--electrolyte interface is affected by the internal fluctuations of the solid and quantify the role of solid excitations on ionic friction. Combining molecular dynamics simulations with theoretical modeling, we show that the presence of ions enhances the dynamical response of the electrolyte compared to pure water. This leads to an ionic contribution to the fluctuation-induced interfacial friction. We show that collective ionic modes dominate the dissipation, such that ionic friction arises from many-body effects rather than from individual drag forces. Furthermore, high-frequency molecular modes are found to be ion-specific, suggesting possible routes toward spectral separation of ions, with implications for desalination, filtration, and energy conversion.

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BibTeX RIS

BibTeX

@misc{toquer2026fluctuationinduced,
  title = {{Fluctuation-induced ionic friction at solid-electrolyte interfaces}},
  author = {Damien Toquer and Baptiste Coquinot and Nikita Kavokine and Lydéric Bocquet},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.40142},
  eprint = {2609.40142},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.40142},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Fluctuation-induced ionic friction at solid-electrolyte interfaces
AU  - Damien Toquer
AU  - Baptiste Coquinot
AU  - Nikita Kavokine
AU  - Lydéric Bocquet
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.40142
UR  - https://arxiv.org/abs/2609.40142
AB  - In this article, we explore how transport at a solid--electrolyte interface is affected by the internal fluctuations of the solid and quantify the role of solid excitations on ionic friction. Combining molecular dynamics simulations with theoretical modeling, we show that the presence of ions enhances the dynamical response of the electrolyte compared to pure water. This leads to an ionic contribution to the fluctuation-induced interfacial friction. We show that collective ionic modes dominate the dissipation, such that ionic friction arises from many-body effects rather than from individual drag forces. Furthermore, high-frequency molecular modes are found to be ion-specific, suggesting possible routes toward spectral separation of ions, with implications for desalination, filtration, and energy conversion.
ER  -

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