Adsorption of the cationic surfactant cetyltrimethylammonium bromide to silica in the presence of sodium salicylate: Surface excess and kinetics

Shaun C. Howard; Vincent S.J. Craig

doi:10.1021/la901889m

Adsorption of the cationic surfactant cetyltrimethylammonium bromide to silica in the presence of sodium salicylate: Surface excess and kinetics

Shaun C. Howard, Vincent S.J. Craig

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

21 Citations (Scopus)

Abstract

The adsorption of cetyltrimethylammonium bromide (CTAB) to silica in the presence of sodium salicylate has been investigated using atomic force microscopy, optical reflectometry, and a quartz crystal micro balance. Salicylate is found to have a dramatic influence on surface adsorption in terms of the kinetics, surface excess, structure of adsorbed aggregates and the mechanical rigidity of the adsorbed film. This is consistent with the bulk solution behavior of more concentrated CTAB - salicylate solutions and reflects the higher local concentration induced by adsorption to the silica surface. Slow adsorption kinetics are found over a wide range of concentrations below the critical micelle concentration.

Original language	English
Pages (from-to)	13015-13024
Number of pages	10
Journal	Langmuir
Volume	25
Issue number	22
DOIs	https://doi.org/10.1021/la901889m
Publication status	Published - 17 Nov 2009

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abstract = "The adsorption of cetyltrimethylammonium bromide (CTAB) to silica in the presence of sodium salicylate has been investigated using atomic force microscopy, optical reflectometry, and a quartz crystal micro balance. Salicylate is found to have a dramatic influence on surface adsorption in terms of the kinetics, surface excess, structure of adsorbed aggregates and the mechanical rigidity of the adsorbed film. This is consistent with the bulk solution behavior of more concentrated CTAB - salicylate solutions and reflects the higher local concentration induced by adsorption to the silica surface. Slow adsorption kinetics are found over a wide range of concentrations below the critical micelle concentration.",

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AB - The adsorption of cetyltrimethylammonium bromide (CTAB) to silica in the presence of sodium salicylate has been investigated using atomic force microscopy, optical reflectometry, and a quartz crystal micro balance. Salicylate is found to have a dramatic influence on surface adsorption in terms of the kinetics, surface excess, structure of adsorbed aggregates and the mechanical rigidity of the adsorbed film. This is consistent with the bulk solution behavior of more concentrated CTAB - salicylate solutions and reflects the higher local concentration induced by adsorption to the silica surface. Slow adsorption kinetics are found over a wide range of concentrations below the critical micelle concentration.

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Adsorption of the cationic surfactant cetyltrimethylammonium bromide to silica in the presence of sodium salicylate: Surface excess and kinetics

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