Localisation-delocalisation transition of electrolytes between micro-electrodesA. Esztermann, R. Messina and H. Löwen
Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1, D-40225 Düsseldorf, Germany
received 20 October 2005; accepted in final form 17 January 2006
published online 1 February 2006
Employing computer simulations and Poisson-Boltzmann theory, we show that a symmetric electrolyte in an electric condenser undergoes a localisation-delocalisation transition as a function of the external voltage U. The transition occurs at the critical voltage corresponding to the situation where the surface charge density of the plates equals the area charge density of completely charge-separated electrolytes. The average distance of the electrolyte ions to the plates diverges logarithmically for . This transition is expected to be observable in micro-electrodes.
61.20.Qg - Structure of associated liquids: electrolytes, molten salts, etc.
61.20.Ja - Computer simulation of liquid structure.
82.70.Dd - Colloids.
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