Liquid-liquid interfacial tension of electrolyte solutions

Markus Bier, J.W. Zwanikken, R.H.H.G. van Roij

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

It is theoretically shown that the excess liquid-liquid interfacial tension between two electrolyte solutions as a function of the ionic strength I behaves asymptotically as (-) for small I and as (±I) for large I. The former regime is dominated by the electrostatic potential due to an unequal partitioning of ions between the two liquids whereas the latter regime is related to a finite interfacial thickness. The crossover between the two asymptotic regimes depends sensitively on material parameters suggesting that the experimentally accessible range of ionic strengths can correspond to either the small or the large ionic strength regime. In the limiting case of a liquid-gas surface where ion partitioning is absent, the image charge interaction can dominate the surface tension for small ionic strength I such that an Onsager-Samaras limiting law (-Iln(I)) is expected.
Original languageUndefined/Unknown
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume101
Issue number046104
Publication statusPublished - 2008

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