Why Direct or Reversed Hofmeister Series? Interplay of Hydration,Non-electrostatic Potentials, and Ion Size
2010 (English)In: Langmuir, ISSN 0743-7463, Vol. 26, no 5, 3323-3328 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:liu:diva-52025DOI: 10.1021/la903061hISI: 000274636900053OAI: oai:DiVA.org:liu-52025DiVA: diva2:278914