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The interfacial structure of polymeric surfactant stabilised air-in-water foams

The interfacial structure of polymeric surfactant stabilised air-in-water foams

Hurcom, Jamie, Paul, Alison, Heenan, Richard K., Davies, Alun, Woodman, Nicholas, Schweins, Ralf and Griffiths, Peter C. (2014) The interfacial structure of polymeric surfactant stabilised air-in-water foams. Soft Matter, 10 (17). pp. 3003-3008. ISSN 1744-683X (Print), 1744-6848 (Online) (doi:10.1039/c3sm52877d)

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Abstract

Small-angle neutron scattering was used to probe the interfacial structure of nitrogen-in-water foams created using a series of tri-block polymeric surfactants of the poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (EOx–POy–EOx) range, from which the nature of the polymeric interface could be characterised. The data follow a pronounced Q−4 decay, along with a number of inflexions and weak but well-defined peaks. These characteristics were well-described by a model embodying paracrystalline stacks of adsorbed polymer layers, whose formation is induced by the presence of the air–water interface, adsorbed at the flat air–water (film lamellae) interface. A minimum of approximately five paracrystalline polymer layers of thickness of the order of 85–160 Å, interspersed with somewhat thicker (400 Å) films of continuous aqueous phase were found to best fit the data. The thickness of the layer (L) was shown to follow a relationship predicted by anchor block dominated polymer adsorption theories from non-selective solvents, L EO1PO1/3. The insight gained from these studies should permit a more rational design of polymeric stabilisers for hydrophilic polyurethane foams.

Item Type: Article
Additional Information: [1] Copyright: © The Royal Society of Chemistry 2014. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. [2] Additional informaition: Electronic supplementary information (ESI) available: Foam stability behaviour for 5 surfactants (L62, P123, PE6400, PE6800, F108) at 5% w/v and 20 degrees C. See DOI: 10.1039/c3sm52877d.
Uncontrolled Keywords: pluronic foams, small-angle neutron scattering
Subjects: R Medicine > RS Pharmacy and materia medica
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
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Last Modified: 11 Apr 2017 08:47
Selected for GREAT 2016: GREAT b
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/12524

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