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Ion specific surface charge density of SBA-15 mesoporous Silica

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


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]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Langmuir
DOI: 10.1021/la902721a


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