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

Shaun Christopher Howard; Rob Atkin; Vincent Stuart James Craig

doi:10.1016/j.colsurfa.2009.01.014

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

Shaun Christopher Howard, Rob Atkin, Vincent Stuart James Craig^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	109-113
Number of pages	5
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	347
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2009.01.014
Publication status	Published - 5 Sept 2009

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title = "Effect of electrolyte species on the adsorption of a cationic surfactant to silica: The common intersection point",

abstract = "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.",

keywords = "CTAB, Common intersection point, Electrolyte, Optical reflectometry, Silica, Specific ion effects",

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T1 - Effect of electrolyte species on the adsorption of a cationic surfactant to silica

T2 - The common intersection point

AU - Howard, Shaun Christopher

AU - Atkin, Rob

AU - Craig, Vincent Stuart James

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Y1 - 2009/9/5

N2 - 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.

AB - 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.

KW - CTAB

KW - Common intersection point

KW - Electrolyte

KW - Optical reflectometry

KW - Silica

KW - Specific ion effects

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DO - 10.1016/j.colsurfa.2009.01.014

M3 - Article

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JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

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ER -

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

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