Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica
2010 (English)In: Langmuir, ISSN 0743-7463, Vol. 26, no 4, 2484-2490 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:liu:diva-52026DOI: 10.1021/la902721aISI: 000274342200047OAI: oai:DiVA.org:liu-52026DiVA: diva2:278916