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Issue 7, 2006
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A disjoining pressure study of foam films stabilized by tetradecyl trimethyl ammonium bromide C14TAB†

Judith Schulze-Schlarmann,a   Natalie Buchavzovb  and  Cosima Stubenrauch*c  
Author affiliations

* Corresponding authors

a Engelhard Process Chemicals GmbH, Freundallee 23, 30173 Hannover, Germany

b Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln, Germany

c University College Dublin, School of Chemical and Bioprocess Engineering, Belfield, Dublin 4, Ireland
E-mail: cosima.stubenrauch@ucd.ie
Fax: +353-1-716-1177
Tel: +353-1-716-1923

Abstract

In the present study disjoining pressure versus thickness curves (Π–h curves) of the cationic surfactant tetradecyl trimethyl ammonium bromide (C14TAB) were measured as a function of the surfactant concentration and of the electrolyte concentration. The former measurements were used to determine the dissociation degree of C14TAB in a confined geometry, i.e. in a thin common black film (CBF). The latter measurements allowed us to determine the electrolyte concentration at which a Newton black film (NBF) is formed and to study the influence the foam film type (CBF or NBF) has on the stability of the respective foam. Last but not least, CBFs were studied in a temperature gradient and it was found that water diffuses from cold to hot regions which can be explained with a negative Soret coefficient of H2O. All of these examples demonstrate that Π–h curves provide much more information about foam films than simply the interaction forces.

Graphical abstract: A disjoining pressure study of foam films stabilized by tetradecyl trimethyl ammonium bromide C14TAB

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Article information

https://doi.org/10.1039/B602975B
Submitted
27 Feb 2006
Accepted
17 May 2006
First published
31 May 2006
Soft Matter, 2006,2, 584-594
Article type
Paper
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A disjoining pressure study of foam films stabilized by tetradecyl trimethyl ammonium bromide C14TAB

J. Schulze-Schlarmann, N. Buchavzov and C. Stubenrauch, Soft Matter, 2006, 2, 584
DOI: 10.1039/B602975B

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