Volume 74, Number 5, June 2006
|Page(s)||854 - 860|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||26 April 2006|
Surface tension of electrolyte solutions: Comparing the effects of ionic dispersion forces and solvation
Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University - ACT 0200, Australia
Accepted: 30 March 2006
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 solvation 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 , and find that solvation is the dominant effect.
PACS: 68.03.Cd – Surface tension and related phenomena / 82.45.Gj – Electrolytes
© EDP Sciences, 2006
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