Probing the role of interfacial rheology in the relaxation behaviour between deformable oil droplets using force spectroscopy

Gunning, A. Patrick, Kirby, Andrew R., Wilde, Peter J., Penfold, Robert, Woodward, Nicola C. and Morris, Victor J. (2013) Probing the role of interfacial rheology in the relaxation behaviour between deformable oil droplets using force spectroscopy. Soft Matter, 9 (48). pp. 11473-11479. ISSN 1744-683X

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Abstract

An experimental method is presented for investigating the effect of the nature of the interface on the relaxation behaviour accompanying hydrodynamic drainage occurring between oil droplets driven together in aqueous solution. This method is based upon force spectroscopy of droplet-droplet interactions. An atomic force microscope is used to drive two droplets together to a pre-defined force and then monitor relaxation of the force between the droplets. It is suggested that the observed relaxation is controlled by the hydrodynamic drainage of the interlamellar fluid separating the droplets. Data is presented for both ionic (sodium dodecyl sulphate) and non-ionic surfactants (Tween-20), uncoated oil droplets and droplets coated with the proteins, beta-casein and beta-lactoglobulin. Uncoated droplets, droplets coated with surfactants and droplets coated with the protein b-casein all exhibited fast relaxation, whereas droplets coated with beta-lactoglobulin exhibited markedly slower relaxation and more complex behaviour.

Item Type: Article
Uncontrolled Keywords: thin liquid-films,dynamic forces,competitive displacement,drops,protein,model,water,adsorption,microscopy,foams
Faculty \ School: Faculty of Science > School of Mathematics
Faculty of Science > School of Pharmacy
Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 24 Sep 2016 01:55
Last Modified: 25 Jul 2018 12:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/60287
DOI: 10.1039/c3sm52341a

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