Journal
LANGMUIR
Volume 27, Issue 3, Pages 1009-1014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la103039v
Keywords
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Funding
- Centre National de Recherche Spatiale (CNES)
- European Space Agency (ESA) [AO-99-075, 108]
- Israel Science Foundation (ISF) [231/08]
- US-Israel Binational Science Foundation (BSF) [2006/055]
- MICIN
- Triangle de la Physique, France [2008-027T]
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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.
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