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Adsorption et rhéologie interfaciale de complexes polyélectrolytes-tensioactifs

Abstract : The first part of this thesis is an experimental study of the adsorption of oppositely charged surfactant/polyelectrolyte complexes at the air-water interface using ellipsometry, surface tension and observation of foam-film drainage. The complexes can form hydrophobic globules that adsorb in heterogeneous and thick layers rearranging very slowly. The structure and thickness of these layers depends on the ratio of surfactant to polyelectrolyte concentrations as well as the hydrophobicity of the surfactant which influence the affinity of the complexes for the air-water interface. Moreover the polyelectrolyte molecular weight is a parameter that controls the size of the complexes and the thickness of the layers. The second part deals with the surface rheology of these adsorbed layers using both shear and dilatational deformations. The measurements show the formation of soft physical gels at the interface. Lastly, we present the details of the construction of a surface magnetic viscometer.
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https://tel.archives-ouvertes.fr/tel-00007353
Contributor : Cécile Monteux <>
Submitted on : Tuesday, November 9, 2004 - 3:01:29 PM
Last modification on : Thursday, December 10, 2020 - 12:37:00 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:14:18 PM

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  • HAL Id : tel-00007353, version 1

Citation

Cécile Monteux. Adsorption et rhéologie interfaciale de complexes polyélectrolytes-tensioactifs. Biophysique [physics.bio-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00007353⟩

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