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Bubble dynamics relaxation in aqueous foam probed by multispeckle diffusing-wave spectroscopy
1Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université de Marne-la-Vallée, 5 Bd Descartes, Champs-sur-Marne, 77454 Marne-la-Vallée cedex 2, France.
Physical Review Letters
|June 1, 2001
Summary
We investigated how bubble rearrangements in foam change from liquid to solid behavior after shear. The study reveals that the time between bubble rearrangements follows an exponential decay after the disturbance.
Area of Science:
- Soft Matter Physics
- Rheology
- Foam Science
Background:
- Aqueous foams exhibit transitions from liquidlike to solidlike states.
- Shear deformation can perturb bubble packing and influence foam dynamics.
- Understanding bubble rearrangement is crucial for foam stability and applications.
Purpose of the Study:
- To investigate bubble rearrangement dynamics in aqueous foam during liquid-solid transition.
- To probe the local dynamics following transient shear deformation.
- To correlate relaxation time with perturbation amplitude and foam age.
Main Methods:
- Utilized multispeckle diffusing-wave spectroscopy to probe local dynamics.
- Applied transient shear deformation to perturb bubble packing.
- Analyzed the relaxation of average time between rearrangements.
Main Results:
- Observed an exponential relaxation of the average time between rearrangements.
- The relaxation time is dependent on the time elapsed since perturbation.
- The characteristic relaxation time scales with perturbation amplitude and foam age.
Conclusions:
- Bubble rearrangement dynamics follow predictable patterns during foam stiffening.
- A schematic coarse-grained model explains the observed scaling behavior.
- Findings contribute to understanding foam rheology and structural evolution.