Dynamic Surface Tension of Aqueous Solutions of Ionic Surfactants: Role of Electrostatics

The adsorption kinetics of the cationic surfactant dodecyltrimethylammonium bromide at the air−water interface has been studied by the maximum bubble pressure method at concentrations below the critical micellar concentration. At short times, the adsorption is diffusion-limited. At longer times, the...

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Bibliographic Details
Published in:Langmuir 2011-02, Vol.27 (3), p.1009-1014
Main Authors: Ritacco, Hernán, Langevin, Dominique, Diamant, Haim, Andelman, David
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Micelles. Thin films
Other
Surface physical chemistry
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Summary:The adsorption kinetics of the cationic surfactant dodecyltrimethylammonium bromide at the air−water interface has been studied by the maximum bubble pressure method at concentrations below the critical micellar concentration. At short times, the adsorption is diffusion-limited. At longer times, the surface tension shows an intermediate plateau and can no longer be accounted for by a diffusion-limited process. Instead, adsorption appears kinetically controlled and slowed down by an adsorption barrier. A Poisson−Boltzmann theory for the electrostatic repulsion from the surface does not fully account for the observed potential barrier. The possibility of a surface phase transition is expected from the fitted isotherms but has not been observed by Brewster angle microscopy.
ISSN:0743-7463
1520-5827
1520-5827
DOI:10.1021/la103039v