No underscreening in dense electrolytes
ORAL
Abstract
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 kBT 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.
J. Zeman et al.,
Bulk ionic screening lengths from extremely large- scale molecular dynamics simulations, submitted.
J. Zeman et al.,
Bulk ionic screening lengths from extremely large- scale molecular dynamics simulations, submitted.
*Computer time was granted through DFG grant no INST 37/935-1 FUGG. We are grateful for computing resources on the Cray XC40 (Hazel Hen) cluster provided by the HLRS Stuttgart, Germany. C.H. acknowledges financial contributions from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy - EXC 2075 - 390740016.
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Presenters
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Christian Holm
- University of Stuttgart
- Institute for Computational Physics, University of Stuttgart
- ICP, University of Stuttgart