Ion specific surface charge density of SBA-15 mesoporous silica

A. Salis; D.F. Parsons; M. Boström; L. Medda; B. Barse; B.W. Ninham; M. Monduzzi

doi:10.1021/la902721a

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Ion specific surface charge density of SBA-15 mesoporous silica

Journal article

Peer reviewed

Ion specific surface charge density of SBA-15 mesoporous silica

A. Salis, D.F. Parsons, M. Boström, L. Medda, B. Barse, B.W. Ninham and M. Monduzzi

Langmuir, Vol.26(4), pp.2484-2490

2010

DOI: https://doi.org/10.1021/la902721a

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Abstract

Potentiometric titrations were used to estimate the surface charge density of SBA-15 mesoporous silica in different salt solutions. It was found that surface charge depends both on cation type, following a Hofmeister series (Cs+ <Guanidinium+<K+<Na +<Li+), and on salt concentration (in the range 0.05-1 M). The surface charge series is reproduced by theoretical calculations performed using a modified Poisson-Boltzmann equation that includes ionic dispersion forces with ab initio ion polarizabilities and hydrated ions. The hydration model assigns an explicit hydration shell to kosmotropic (strong hydrated) ions only. The Hofmeister series appears to be due to the combination of ionsurface dispersion interactions and ion hydration.

Details

Title: Ion specific surface charge density of SBA-15 mesoporous silica
Authors/Creators: A. Salis (Author/Creator)
D.F. Parsons (Author/Creator) - Australian National University
M. Boström (Author/Creator) - University of Cagliari
L. Medda (Author/Creator) - University of Cagliari
B. Barse (Author/Creator) - University of Cagliari
B.W. Ninham (Author/Creator) - Australian National University
M. Monduzzi (Author/Creator) - University of Cagliari
Publication Details: Langmuir, Vol.26(4), pp.2484-2490
Publisher: American Chemical Society
Identifiers: 991005541649907891
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