https://doi.org/10.1140/epje/s10189-023-00378-4
Regular Article - Flowing Matter
Surface tension between liquids containing antagonistic and regular salts
Chemical Engineering, Ben-Gurion University of the Negev, 84105, Beer-Sheva, Israel
Received:
10
August
2023
Accepted:
13
November
2023
Published online:
29
November
2023
We investigate theoretically the surface tension between two immiscible liquids containing antagonistic and regular salts. The mean-field model includes the electrostatic energy and the Gibbs transfer energy of the ions. We find the Donnan potential difference between the liquids and solve the Poisson–Boltzmann equation to calculate the potential and ion density profiles. When the liquids contain only a regular salt, the surface tension increases when compared to the no-salt case; in contrast, the surface tension is reduced when they contain only an antagonistic salt. When both salts are present, the surface tension can either further decrease or increase depending on the preferential solvation of the ions, in agreement with published experimental observations.
Roni Kroll, Moshe Gottlieb and Yoav Tsori contributed equally to this work.
We thank Fyl Pincus for countless illuminating talks, profound ideas, and valuable discussions. We wish him to continue to be an inspiration to us and the soft matter community for many years.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
