Stray-field NMR diffusion q-space diffraction imaging of monodisperse coarsening foams

Research output: Contribution to journalArticle

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 50-85 μm. 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.

Details

Authors
  • Kieron Smith
  • Adam Burbidge
  • David Apperley
  • Paul Hodgkinson
  • Fraser A. Markwell
  • Daniel Topgaard
  • Eric Hughes
Organisations
External organisations
  • Durham University
  • Nestlé
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry

Keywords

  • Coarsening, Diffraction, Diffusion, Foam, Monodisperse, NMR, Relaxation, Stray field
Original languageEnglish
Pages (from-to)20-28
Number of pages9
JournalJournal of Colloid and Interface Science
Volume476
Publication statusPublished - 2016 Aug 15
Publication categoryResearch
Peer-reviewedYes