title: Stray-field NMR diffusion q-space diffraction imaging of monodisperse coarsening foams.
abstract: The technique of stray field diffusion NMR is adapted to study the diffusion properties of water in monodisperse wet foams. We show for the first time, that the technique is capable of observing q-space diffusion diffraction peaks in monodisperse aqueous foams with initial bubble sizes in the range of 50-85μm. The position of the peak maximum can be correlated simply to the bubble size in the foam leading to a technique that can investigate the stability of the foam over time. The diffusion technique, together with supplementary spin-spin relaxation analysis of the diffusion data is used to follow the stability and coarsening behaviour of monodisperse foams with a water fraction range between 0.24 and 0.33. The monodisperse foams remain stable for a period of hours in terms of the initial bubble size. The duration of this stable period correlates to the initial size of the bubbles. Eventually the bubbles begin to coarsen and this is observed in changes in the position of the diffusion diffraction maxima.
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
authors.forename: Kieron
authors.initials: K
authors.lastname: Smith
authors.affiliation: Nestle Research Centre, Nestec Ltd. Vers-chez-les-Blanc, Case Postale 44, 1000 Lausanne 26, Switzerland.
authors.forename: Adam
authors.initials: A
authors.lastname: Burbidge
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
authors.forename: David
authors.initials: D
authors.lastname: Apperley
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
authors.forename: Paul
authors.initials: P
authors.lastname: Hodgkinson
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
authors.forename: Fraser A
authors.initials: FA
authors.lastname: Markwell
authors.affiliation: Division of Physical Chemistry, Department of Chemistry, Lund University, SE-221 00 Lund, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Topgaard
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK. Electronic address: eric.hughes@dur.ac.uk.
authors.forename: Eric
authors.initials: E
authors.lastname: Hughes
keywords: Coarsening; Diffraction; Diffusion; Foam; Monodisperse; NMR; Relaxation; Stray field