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Dynamic Surface Tension of Aqueous Solutions of Ionic Surfactants: Role of Electrostatics
- Source :
- Langmuir 27, 1009-1014 (2011)
- Publication Year :
- 2010
-
Abstract
- 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.<br />Comment: 13 pages, 5 figures
Details
- Database :
- arXiv
- Journal :
- Langmuir 27, 1009-1014 (2011)
- Publication Type :
- Report
- Accession number :
- edsarx.1008.1230
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1021/la103039v