Effect of electrolyte species on the adsorption of a cationic surfactant to silica: the common intersection point

Title: Effect of electrolyte species on the adsorption of a cationic surfactant to silica: the common intersection point
Creator: Howard, Shaun Christopher; Atkin, Rob; Craig, Vincent Stuart James
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
Publisher: Elsevier
Resource Type: journal article
Date: 2009
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.
Subject: optical reflectometry; CTAB; silica; common intersection point; specific ion effects; electrolytes
Identifier: uon:8103
Identifier: http://hdl.handle.net/1959.13/916775
Identifier: ISSN:0927-7757
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