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Why Direct or Reversed Hofmeister Series? Interplay of Hydration,Non-electrostatic Potentials, and Ion Size
Research School of Physical Sciences and Engineering, Australian National University, Canberra.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Department of Chemical Sciences, University of Cagliari - CSGI, Moserrato, Italy.
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2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 5, 3323-3328 p.Article in journal (Refereed) Published
Abstract [en]

A modified Poisson-Boltzmann analysis is made of the double layer interaction between two silica surfaces and twoalumina surfaces in chloride electrolyte. The analysis incorporates nonelectrostatic ion-surface dispersion interactionsbased on ab initio ionic excess polarizabilities with finite ion sizes. A hydration model for the tightly held hydration shellof kosmotropic ions is introduced. A direct Hofmeister series (K > Na > Li) is found at the silica surface while thereversed series (Li > Na > K) is found at alumina, bringing theory in line with experiment for the first time.Calculations with unhydrated ions also suggest that surface-induced dehydration may be occurring at the aluminasurface.

Place, publisher, year, edition, pages
2010. Vol. 26, no 5, 3323-3328 p.
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Physical Sciences
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URN: urn:nbn:se:liu:diva-52025DOI: 10.1021/la903061hISI: 000274636900053OAI: oai:DiVA.org:liu-52025DiVA: diva2:278914
Available from: 2009-11-30 Created: 2009-11-30 Last updated: 2017-12-12

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Boström, Mathias

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