Volume 95, Number 6, September 2011
|Number of page(s)||5|
|Published online||26 August 2011|
Electrostatic interactions in critical solvents
Max-Planck-Institut für Intelligente Systeme - Heisenbergstr. 3, 70569 Stuttgart, Germany, EU
2 Institut für Theoretische und Angewandte Physik, Universität Stuttgart - Pfaffenwaldring 57, 70569 Stuttgart, Germany, EU
3 SISSA, International School for Advanced Studies and INFN - 34136 Trieste, Italy, EU
4 Laboratoire de Physique Théoretique et Hautes Energies, UMR 7589, Université Pierre et Marie Curie/Paris VI 75252 Paris Cedex 05, France, EU
5 Institut für Physik, Johannes-Gutenberg-Universität Mainz - WA 331, 55099 Mainz, Germany, EU
Accepted: 27 July 2011
The subtle interplay between critical phenomena and electrostatics is investigated by considering the effective force acting on two parallel walls confining a near-critical binary liquid mixture with added salt. The ion-solvent coupling can turn a non-critical repulsive electrostatic force into an attractive one upon approaching the critical point. However, the effective force is eventually dominated by the critical Casimir effect, the universal properties of which are not altered by the presence of salt. This observation allows a consistent interpretation of recent experimental data.
PACS: 05.70.Np – Interface and surface thermodynamics / 05.70.Jk – Critical point phenomena / 82.45.Gj – Electrolytes
© EPLA, 2011
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