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Multiple dynamic regimes in a coarsening foam.

Fabio Giavazzi1, Veronique Trappe2, Roberto Cerbino1

  • 1Dipartimento di Biotecnologie Mediche e Medicina Traslazionale, Università degli Studi di Milano, via F.lli Cervi 93, 20090 Segrate, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 9, 2020
PubMed
Summary
This summary is machine-generated.

Intermittent dynamics in coarsening foams were studied using microscopy. A novel scaling law for foam relaxation rates at low wavevectors (q) was discovered, explained by a bubble displacement cut-off.

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Area of Science:

  • Soft Matter Physics
  • Disordered Systems Dynamics
  • Foam Science

Background:

  • Intermittent dynamics in disordered systems are poorly understood.
  • Foams exhibit complex behaviors due to internal stress imbalances.

Purpose of the Study:

  • Investigate intermittent dynamics in coarsening foams.
  • Characterize foam dynamics across different length and time scales.

Main Methods:

  • Differential dynamic microscopy (DDM) for reciprocal space analysis.
  • Particle tracking for direct space analysis.
  • Analysis of bubble displacement distributions.

Main Results:

  • Intermediate scattering function shows compressed exponential decay.
  • Two distinct regimes observed in the relaxation rate's (Γ(q)) dependence on wavevector (q).
  • Discovered a novel scaling Γ(q) ∼ q1.6±0.2 at low q, explained by a bubble diameter-scale displacement cut-off.

Conclusions:

  • The observed dynamics are consistent with directionally-persistent, intermittent bubble displacements.
  • A model incorporating a displacement cut-off successfully explains the experimental results.
  • Provides a framework for understanding stress-driven dynamics in disordered systems.