Anion Effect on Surface Density of Silanolate Groups in As-Synthesized Mesoporous Silicas

Anions present in the synthesis gel (X = F-, Cl-, Br-, NO3 -, and SO4 2-) partly remain in the channels of mesoporous templated silicas prepared in basic media. Their lyotropic character and their concentration control the silanolate group (⋮SiO-) density at the surfactant−inorganic interface throug...

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Bibliographic Details
Published in:Langmuir 1998-12, Vol.14 (25), p.7087-7090
Main Authors: Badiei, Ali-Reza, Cantournet, Sylvie, Morin, Michel, Bonneviot, Laurent
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Ion-exchange
Other ion exchangers: preparations and properties
Surface physical chemistry
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Summary:Anions present in the synthesis gel (X = F-, Cl-, Br-, NO3 -, and SO4 2-) partly remain in the channels of mesoporous templated silicas prepared in basic media. Their lyotropic character and their concentration control the silanolate group (⋮SiO-) density at the surfactant−inorganic interface through the electrical charge neutrality, implicating the positive charges of the templating self-assembled surfactants, S+. Accordingly, the well-accepted {S+ I-} generic pathway should be better referred as to {S+, mX-, (1 − m)I-}.
ISSN:0743-7463
1520-5827
DOI:10.1021/la981134h