Particle-stabilised foams: an interfacial study

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

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.

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. https://doi.org/10.1039/b901180c

• Journal Article Type: Article
• Acceptance Date: Mar 19, 2009
• Online Publication Date: Apr 24, 2009
• Publication Date: Jul 14, 2009
• Journal: SOFT MATTER
• Print ISSN: 1744-683X
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 11
• Pages: 2215-2222
• DOI: https://doi.org/10.1039/b901180c
• Keywords: General Chemistry; Condensed Matter Physics
• Public URL: https://hull-repository.worktribe.com/output/391351