Why Direct or Reversed Hofmeister Series? Interplay of Hydration, Non-electrostatic Potentials, and Ion Size

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...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir 2010-03, Vol.26 (5), p.3323-3328
Main Authors: Parsons, D. F, Boström, M, Maceina, T. J, Salis, A, Ninham, B. W
Format: Article
Language:English
Subjects:
Aluminum Oxide - chemistry
Chemistry
Chlorides - chemistry
Colloidal state and disperse state
Electrolytes - chemistry
Exact sciences and technology
Fysik
General and physical chemistry
Hydrogen-Ion Concentration
Interfaces: Adsorption, Reactions, Films, Forces
Metals, Alkali - chemistry
NATURAL SCIENCES
NATURVETENSKAP
Physics
Salts - chemistry
Silicon Dioxide - chemistry
Static Electricity
Surface physical chemistry
Surface Properties
Water - chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0743-7463
1520-5827
1520-5827
DOI:10.1021/la903061h