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Hofmeister effects in surface tension of aqueous electrolyte solution
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
Inst. of Phys. and Theor. Chemistry, University of Regensburg, D-93040 Regensburg, Germany.
Inst. of Phys. and Theor. Chemistry, University of Regensburg, D-93040 Regensburg, Germany, Res. Sch. of Phys. Sci. and Eng., Australian National University, Canberra 0200, Australia.
2005 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 21, no 6, 2619-2623 p.Article in journal (Refereed) Published
Abstract [en]

The surface tension of electrolyte solutions shows marked specific ion effects. We here show an important role for both ionic solvation energies and ionic dispersion potentials in determining this ion specific surface tension of salt solutions. The ion self-free energy changes when an ion moves from bulk solution into the interfacial region, with its decreasing water density profile. We will show that the solvation energies of different ions correlate very well with the surface tension of salt solutions. Inclusion of this distance-dependent self-free energy contribution brings qualitative agreement with experiments and the right Hofmeister series. This is so not only for surface tension changes but also for measured surface potentials. The inclusion of ionic dispersion interaction potentials further improves the agreement with experiments. We discuss how further progress in the theory of the surface tension of salts can be achieved. © 2005 American Chemical Society.

Place, publisher, year, edition, pages
2005. Vol. 21, no 6, 2619-2623 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-45487DOI: 10.1021/la047437vOAI: oai:DiVA.org:liu-45487DiVA: diva2:266383
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Boström, Mathias

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