Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
595842 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2009 | 5 Pages |
Abstract
Adsorption isotherms for cetyltrimethylammonium bromide (CTAB) on silica have been measured using optical reflectometry (OR) in the presence of 1Â mM and 10Â 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 0.035Â mM considerably higher than the CIP for NaBr and KBr (0.025Â mM), indicating specific adsorption of Cs+ ions to silica.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Shaun Christopher Howard, Rob Atkin, Vincent Stuart James Craig,