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TU Berlin

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1991 - 2000

Polymer/surfactant complexes at the water/air interface: A surface tension and X-ray reflectivity study
Citation key stub000
Author Stubenrauch, C. and Albouy, P. A. and von Klitzing, R. and Langevin, D.
Pages 3206–3213
Year 2000
Journal Langmuir
Volume 16
Number 7
Month apr
Abstract The water/air interface of dilute mixed solutions of dodecyl trimethylammonium bromide and different non-surface-active anionic polyelectrolytes has been investigated by measuring the surface tensions and the X-ray reflectivities. A strong synergistic lowering of the surface tension is found for all surfactant/polyelectrolyte mixtures. This decrease is caused by the formation of polyelectrolyte/surfactane complexes at the surface. It has been detected that these complexes form a relatively dense surface layer. When the surfactant and/or polyelectrolyte concentration is varied, the thickness and density of these surface layers remain nearly constant for a given polyelectrolyte. However, although all the different polyelectrolytes adsorb in a flat configuration, the properties of the adsorbed layers depend slightly on the nature of the polyelectrolyte.
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