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Particle-stabilised foams: an interfacial study

Drenckhan, Wiebke; Stocco, Antonio; Rio, Emanuelle; Langevin, Dominique; Binks, Bernard P.

Authors

Wiebke Drenckhan

Antonio Stocco

Emanuelle Rio

Dominique Langevin



Abstract

In an attempt to elucidate the remarkable stability of foams generated from dispersions of partially hydrophobic nanoparticles (fumed silica), we present investigations into the static and dilational properties of the gas-liquid interfaces of such dispersions. By relating the dynamic surface tension gamma(t) and the dilational elasticity E measured using an oscillating bubble device, we confirm that the Gibbs stability criterion E > gamma/2 against foam coarsening is fulfilled. We complement these studies using ellipsometry and Brewster angle microscopy, which provide evidence for a pronounced adsorption barrier for the particles and a network-like structure in the interface at sufficiently high concentrations. We observe this structure also in freely suspended films drawn from the same particle dispersions.

Journal Article Type Article
Publication Date Jul 14, 2009
Journal SOFT MATTER
Print ISSN 1744-683X
Electronic ISSN 1744-6848
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 5
Issue 11
Pages 2215-2222
APA6 Citation Stocco, A., Drenckhan, W., Rio, E., Langevin, D., & Binks, B. P. (2009). Particle-stabilised foams: an interfacial study. Soft matter, 5(11), 2215-2222. doi:10.1039/b901180c
DOI https://doi.org/10.1039/b901180c
Keywords General Chemistry; Condensed Matter Physics
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