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TU Berlin

Inhalt des Dokuments

2001 - 2005

Interactions between polyelectrolyte brushes in free-standing liquid films: influence of ionic strength
Citation key kola02
Author Kolaric, B. and Förster, S. and Klitzing, Regine
Title of Book Adsorption and Nanostructure
Pages 195-199
Year 2002
ISBN 978-3-540-41946-4
Volume 117
Note 10.1007/3-540-45405-5_35
Editor D Imre
Publisher Springer Berlin / Heidelberg
Series Progress in Colloid and Polymer Science
Abstract Foam films of charged amphiphilic diblock copolymers are investigated using a thin-film balance. At low polymer concentrations the disjoining pressure shows a continuous exponential decay as a function of the thickness This indicates film stabilization by electrostatic repulsion. At higher polymer concentration stratification occurs with increasing pressure. This is due to the formation of a layer of block copolymer micelles which is pressed out of the film in analogy to usual foam films containing micelles of small surfactant molecules. With increasing salt concentration the film becomes thinner as the charged part becomes more and more coiled and the surface charges more screened.
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