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Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica
Department of Chemical Sciences, University of Cagliari-CNBS and CSGI, Monserrato, Italy.
Research School of Physical Sciences and Engineering, Australian National University, Canberra.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
Department of Chemical Sciences, University of Cagliari-CNBS and CSGI, Monserrato, Italy .
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2010 (English)In: Langmuir, ISSN 0743-7463, Vol. 26, no 4, 2484-2490 p.Article in journal (Refereed) Published
Abstract [en]

Potentiometric titrations were used to estimate the surface charge density of SBA-15 mesoporous silica in differentsalt solutions. It was found that surface charge depends both on cation type, following a Hofmeister series (Csþ<Guanidiniumþ<Kþ<Naþ<Liþ), and on salt concentration (in the range 0.05-1 M). The surface charge series isreproduced by theoretical calculations performed using a modified Poisson-Boltzmann equation that includes ionicdispersion forces with ab initio ion polarizabilities and hydrated ions. The hydration model assigns an explicit hydrationshell to kosmotropic (strong hydrated) ions only. The Hofmeister series appears to be due to the combination of ionsurfacedispersion interactions and ion hydration.

Place, publisher, year, edition, pages
2010. Vol. 26, no 4, 2484-2490 p.
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-52026DOI: 10.1021/la902721aISI: 000274342200047OAI: diva2:278916
Available from: 2009-11-30 Created: 2009-11-30 Last updated: 2010-02-22

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