Why direct or reversed hofmeister series? interplay of hydration, non-electrostatic potentials, and ion size

D.F. Parsons; M. Boström; T.J. Maceina; A. Salis; B.W. Ninham

doi:10.1021/la903061h

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Why direct or reversed hofmeister series? interplay of hydration, non-electrostatic potentials, and ion size

Journal article

Peer reviewed

Why direct or reversed hofmeister series? interplay of hydration, non-electrostatic potentials, and ion size

D.F. Parsons, M. Boström, T.J. Maceina, A. Salis and B.W. Ninham

Langmuir, Vol.26(5), pp.3323-3328

2010

DOI: https://doi.org/10.1021/la903061h

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Abstract

A modified Poisson-Boltzmann analysis is made of the double layer interaction between two silica surfaces and two alumina surfaces in chloride electrolyte. The analysis incorporates nonelectrostatic ion-surface dispersion interactions based on ab initio ionic excess polarizabilities with finite ion sizes. A hydration model for the tightly held hydration shell of kosmotropic ions is introduced. A direct Hofmeister series (K > Na > Li) is found at the silica surface while the reversed 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 alumina surface.

Details

Title: Why direct or reversed hofmeister series? interplay of hydration, non-electrostatic potentials, and ion size
Authors/Creators: D.F. Parsons (Author/Creator) - Australian National University
M. Boström (Author/Creator) - University of Cagliari
T.J. Maceina (Author/Creator) - Linköping University
A. Salis (Author/Creator)
B.W. Ninham (Author/Creator) - Australian National University
Publication Details: Langmuir, Vol.26(5), pp.3323-3328
Publisher: American Chemical Society
Identifiers: 991005541487207891
Copyright: © 2009 American Chemical Society
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.677 Liquid Water
Web Of Science research areas: Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
ESI research areas: Chemistry