Anomalous Underscreening in the Restricted Primitive Model

Underscreening is a collective term for charge correlations in electrolytes decaying slower than the Debye length. Anomalous underscreening refers to phenomenology that cannot be attributed alone to steric interactions. Experiments with concentrated electrolytes and ionic fluids report anomalous und...

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Bibliographic Details
Published inarXiv.org
Main Authors Härtel, Andreas, Bültmann, Moritz, Coupette, Fabian
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.03.2023
Subjects
Debye length
Decay rate
Electrolytes
Energy storage
Molecular dynamics
Phenomenology
Physics - Soft Condensed Matter
Physics - Statistical Mechanics
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Summary:Underscreening is a collective term for charge correlations in electrolytes decaying slower than the Debye length. Anomalous underscreening refers to phenomenology that cannot be attributed alone to steric interactions. Experiments with concentrated electrolytes and ionic fluids report anomalous underscreening, which so far has not been observed in simulation. We present Molecular Dynamics simulation results exhibiting anomalous underscreening that can be connected to cluster formation. A theory that accounts for ion pairing confirms the trend. Our results challenge the classic understanding of dense electrolytes impacting the design of technologies for energy storage and conversion.
ISSN:2331-8422
DOI:10.48550/arxiv.2209.03486