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Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica

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Salis, Andrea; Parsons, Drew; Bostrom, Mathias Anders; Medda, Luca; Barse, Brajesh; Ninham, Barry; Monduzzi, Maura

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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...[Show more]

dc.contributor.authorSalis, Andrea
dc.contributor.authorParsons, Drew
dc.contributor.authorBostrom, Mathias Anders
dc.contributor.authorMedda, Luca
dc.contributor.authorBarse, Brajesh
dc.contributor.authorNinham, Barry
dc.contributor.authorMonduzzi, Maura
dc.date.accessioned2015-12-10T22:35:22Z
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/1885/56258
dc.description.abstractPotentiometric 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.
dc.publisherAmerican Chemical Society
dc.sourceLangmuir
dc.subjectKeywords: Ab initio; Cation type; Dispersion interaction; Guanidinium; Hofmeister series; Hydrated ions; Hydration shell; Ion hydration; Ion polarizabilities; Ionic dispersion; Mesoporous Silica; Poisson-Boltzmann equations; Potentiometric titrations; Salt concentr
dc.titleIon Specific Surface Charge Density of SBA-15 Mesoporous Silica
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume26
dc.date.issued2010
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.absfor030304 - Physical Chemistry of Materials
local.identifier.ariespublicationu9210271xPUB356
local.type.statusPublished Version
local.contributor.affiliationSalis, Andrea, Universita di Cagliari
local.contributor.affiliationParsons, Drew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBostrom, Mathias Anders, Linkoping University
local.contributor.affiliationMedda, Luca, University of Cagliari-CNBS and CSGI
local.contributor.affiliationBarse, Brajesh , National Institue of Pharmaceutical Education and Research
local.contributor.affiliationNinham, Barry, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMonduzzi, Maura, Universita di Cagliari
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage2484
local.bibliographicCitation.lastpage2490
local.identifier.doi10.1021/la902721a
dc.date.updated2016-02-24T11:55:42Z
local.identifier.scopusID2-s2.0-77149122732
CollectionsANU Research Publications

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