Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/916775

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Title
Effect of electrolyte species on the adsorption of a cationic surfactant to silica: the common intersection point
Author/Creator
Howard, Shaun Christopher;  Atkin, Rob;  Craig, Vincent Stuart James
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
Description
Adsorption isotherms for cetyltrimethylammonium bromide (CTAB) on silica have been measured using optical reflectometry (OR) in the presence of 1 mM and 10 mM NaBr, KBr and CsBr in order to elucidate the role of specific adsorption of the electrolyte to silica. In this regard the surface excess at concentrations up to the common intersection point (CIP) is most revealing as Koopal and co-workers have demonstrated that in the presence of an indifferent electrolyte the CIP corresponds to the isoelectric point and the charge compensation point. CsBr exhibited a CIP at 0.035 mM considerably higher than the CIP for NaBr and KBr (0.025 mM), indicating specific adsorption of Cs⁺ ions to silica.
Relation
Colloids and Surfaces A: Physicochemical and Engineering Aspects Vol. 347, Issue 1-3, p. 109-113
Publisher Link
http://dx.doi.org/10.1016/j.colsurfa.2009.01.014
Date
2009
Publisher
Elsevier
Keyword(s)
optical reflectometry;  CTAB;  silica;  common intersection point;  specific ion effects;  electrolytes
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/916775
Identifier
ISSN:0927-7757
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Subject
"Colloids and Surfaces A: Physicochemical and Engineering Aspects"
 
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