Effect of capillary waves on the double layer capacitance of the interface between two immiscible electrolytes

L. I. Daikhin, A. A. Kornyshev, M. Urbakh

Research output: Contribution to journalConference articlepeer-review

Abstract

The effect of capillary waves on the double layer capacitance of the interface between two immiscible electrolytes has been studied. We have found that a corrugation of the interface due to capillary waves leads to an increase in the capacitance, as compared with the Gouy-Chapman result for a flat interface. The theory offers a concept of a roughness function, R, which determines the deviation of capacitance from the Gouy-Chapman result. R is a function of Debye lengths of the two immiscible electrolytes. Analytical expression for the roughness function has been derived which shows a strong dependence of R on the interfacial tension and the dielectric constants of contacting solutions. Predictions amenable to experimental tests have been discussed.

Original languageEnglish
Pages (from-to)685-690
Number of pages6
JournalElectrochimica Acta
Volume45
Issue number4-5
DOIs
StatePublished - 1 Nov 1999
EventProceedings of the 1998 Portucalensis Conference on Electrified Interfaces - Povoa de Varzim, Portugal
Duration: 5 Jul 199810 Jul 1998

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