Surface tension of electrolyte solutions: Comparing the effects of ionic dispersion forces and solvation
Date
2006
Authors
Edwards, Scott
Williams, David
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Les Editions de Physique
Abstract
The Influence of salt on the surface tension of water is yet to be understood. We derive approximate analytical expressions for the influence of two different ion-specific effects on the surface tension of an electrolyte: the dispersion interaction between the ions and the air-water Interface, and the change in solvatlon energy of the ions as they approach the Interface. These formulae provide a simple means of comparing the relative importance of the two effects. We carry out such a comparison for the case of 1 M NaCl, and find that solvation is the dominant effect.
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Europhysics Letters
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Journal article
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2037-12-31