Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-08-06
Langmuir 27, 1009-1014 (2011)
Physics
Condensed Matter
Soft Condensed Matter
13 pages, 5 figures
Scientific paper
10.1021/la103039v
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.
Andelman David
Diamant Haim
Langevin Dominique
Ritacco Hernan
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