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Bulk Ionic Screening Lengths from Extremely Large-Scale Molecular Dynamics Simulations

preprint
submitted on 11.11.2020, 00:42 and posted on 12.11.2020, 13:02 by Johannes Zeman, Svyatoslav Kondrat, Christian Holm
Recent experiments have reported anomalously large screening lengths of interactions between charged surfaces confining concentrated electrolytes and ionic liquids. Termed underscreening, this effect was ascribed to bulk properties of dense ionic systems. Herein, we study bulk ionic screening with extremely large-scale molecular dynamics simulations, allowing us to assess the range of distances relevant to the experiments. Our results yield two screening lengths satisfying distinct scaling relations. However, with an accuracy of 10^-5 kT in interionic potentials of mean force, we find no signs of underscreening, suggesting that other than bulk effects might be at play in the experiments.

Funding

EXC 2075:  Data-Integrated Simulation Science (SimTech)

Deutsche Forschungsgemeinschaft

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INST 37/935-1 FUGG

History

Email Address of Submitting Author

zeman@icp.uni-stuttgart.de

Institution

Institute for Computational Physics, University of Stuttgart

Country

Germany

ORCID For Submitting Author

0000-0001-7735-5086

Declaration of Conflict of Interest

There are no conflicts to declare.

Version Notes

Preprint of accepted article, bibliographic data will be updated as soon as available.

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