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

Source: [Dynamic Surface Tension of Aqueous Solutions of Ionic Surfactants: Role of Electrostatics](<https://www.sota2.com/research/paper/68fa2a271e209131ce83ace3>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:53:08.661Z

Authors: Hernan Ritacco, Dominique Langevin, Haim Diamant, David Andelman

Published: 2010-08-06T16:30:06.000Z

## 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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1008.1230>)

[PDF](<https://arxiv.org/pdf/1008.1230.pdf>)