Volume 97, Number 2, January 2012
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||04 January 2012|
Overscreening in a 1D lattice Coulomb gas model of ionic liquids
Laboratoire de Physique Théorique (IRSAMC), Université de Toulouse, UPS and CNRS F-31062 Toulouse, France, EU
2 Université de Bordeaux, Laboratoire Ondes et Matière d'Aquitaine (LOMA), UMR 5798 F-33400 Talence, France, EU
3 DAMTP CMS - Wilberforce Road, Cambridge CB3 0WA, UK, EU
4 Department of Theoretical Physics, J. Stefan Institute and Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana - SI-1000 Ljubljana, Slovenia, EU
Accepted: 29 November 2011
Overscreening in the charge distribution of ionic liquids at electrified interfaces is shown to proceed from purely electrostatic and steric interactions in an exactly soluble one-dimensional lattice Coulomb gas model. Being not a mean-field effect, our results suggest that even in higher-dimensional systems the overscreening could be accounted for by a more accurate treatment of the basic lattice Coulomb gas model, that goes beyond the mean-field level of approximation, without any additional interactions.
PACS: 82.45.Gj – Electrolytes / 05.20.Jj – Statistical mechanics of classical fluids / 88.80.fh – Supercapacitors
© EPLA, 2012
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