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2001 - 2005

Comparison of different polymer-like structures in the confined geometry of foam films
Citation key klit01a
Author von Klitzing, R. and Espert, A. and Colin, A. and Langevin, D.
Pages 109–116
Year 2001
Journal Colloids Surf., A
Volume 176
Number 1
Abstract Recent studies by a thin him balance of free standing thin liquid films containing polyelectrolytes result in jump-like discontinuities in the film thickness with increasing pressure. These jumps correspond to an oscillation of the disjoining pressure. They are correlated to a network-like chain structure in the film similar to that one found in aqueous semi-dilute polyelectrolyte solutions. The results presented in this paper show that the application of the theory for polyelectrolytes in bulk solutions to the behaviour in the confined geometry of foam films is generally valid. A surfactant which forms worm-like micelles and two different polyelectrolytes were studied. Though the systems are very different, in all cases the oscillation period of the disjoining pressure scales as 1/root(c) over bar with the concentration c. It is assumed that there is a network of polyelectrolyte chains and worm-like micelles respectively in the foam film and that the oscillation period corresponds to the meshsize (correlation length) of the network. The correlation length calculated by the theory for semi-dilute polyelectrolyte solutions corresponds to the measured jump size at a fixed polyelectrolyte concentration. (C) 2001 Elsevier Science B.V. All rights reserved.
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