Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 352, Issue 1, Pages 114-120Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.08.018
Keywords
Foam; Ostwald ripening; NMR; Bubble size
Categories
Funding
- Australian Research Council [DP0878979]
- UK EPSRC [EP/F047991/1]
- EPSRC [EP/F047991/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F047991/1] Funding Source: researchfish
- Australian Research Council [DP0878979] Funding Source: Australian Research Council
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Pulsed-field gradient nuclear magnetic resonance, previously used for measuring droplet size distributions in emulsions, has been used to measure bubble size distributions in a non-overflowing pneumatic gas-liquid foam that has been created by sparging propane into an aqueous solution of 1.5 g/l (5.20 mM) SDS. The bubble size distributions measured were reproducible and approximated a Weibull distribution. However, the bubble size distributions did not materially change with position at which they were measured within the froth. An analysis of foam coarsening due to Ostwald ripening in a non-overflowing foam indicates that, for the experimental conditions employed, one would not expect this to be a significant effect. It is therefore apparent that the eventual collapse of the foam is due to bubble bursting (or surface coalescence) rather than Ostwald ripening. This surface coalescence occurs because of evaporation from the free surface of the foam. An analytical solution for the liquid fraction profile for a certain class of non-overflowing pneumatic foam is given, and a mean bubble size that is appropriate for drainage calculations is suggested. (C) 2010 Elsevier Inc. All rights reserved.
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