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Convective Cage Release in Model Colloidal Glasses.

Alan R Jacob1, Andreas S Poulos2, Sunhyung Kim3

  • 1IESL-FORTH & Materials Science & Technology Department, University of Crete, 71110 Heraklion, Greece.

Physical Review Letters
|December 5, 2015
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Summary
This summary is machine-generated.

Flow in colloidal glasses is driven by convective cage release, where relaxation time scales linearly with deformation rate. This study reveals insights into glassy material flow mechanisms using mechanical spectroscopy.

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Area of Science:

  • Soft Matter Physics
  • Rheology
  • Materials Science

Background:

  • Understanding the flow behavior of glassy materials is crucial for predicting their macroscopic properties.
  • Colloidal glasses, composed of particles suspended in a liquid, serve as model systems for studying glassy dynamics.

Purpose of the Study:

  • To investigate the microscopic mechanism of flow in colloidal glasses.
  • To directly measure the effect of steady shear flow on microstructural relaxation times.

Main Methods:

  • Application of mechanical spectroscopy with superimposed oscillatory motion on steady shear flow.
  • Analysis of viscoelastic spectra to determine crossover frequency as a measure of relaxation time.
  • Utilizing Brownian dynamics simulations to interpret deviations in scaling behavior.

Main Results:

  • The microstructural relaxation time scales linearly with the rate of deformation.
  • Flow mechanism identified as convective cage release.
  • A strain rate-orthogonal frequency superposition analogous to time-temperature superposition was achieved.

Conclusions:

  • Convective cage release is the primary mechanism governing flow in these colloidal glasses.
  • Deviations from scaling at high and low frequencies are attributed to cage deformation and hydroclustering, respectively.
  • Mechanical spectroscopy provides a powerful tool for probing the dynamics of flowing glassy systems.