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Jamming transition in emulsions and granular materials.

H P Zhang1, H A Makse

  • 1Physics Department, City College of New York, New York 10031, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

We studied jamming transitions in emulsions and granular materials. Both systems show similar scaling near jamming, but granular materials

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • The jamming transition is a critical phenomenon observed in various disordered systems, including granular materials and emulsions.
  • Understanding the jamming transition is crucial for predicting the mechanical properties of these materials.

Purpose of the Study:

  • To investigate the jamming transition in both emulsion and granular material packings using molecular dynamics simulations.
  • To compare the effects of preparation history on the micromechanical properties of these systems.

Main Methods:

  • Molecular dynamics simulations were employed to model frictionless emulsion droplets and deformable granular spheres with friction.
  • Nonlinear normal forces for emulsions were derived from experimental confocal microscopy data.
  • Hertz-Mindlin contact mechanics and Coulomb friction were used for granular materials.

Main Results:

  • Both systems exhibit power-law scaling for pressure and excess contacts near the jamming transition.
  • Granular material properties are sensitive to preparation history (compression rate), unlike emulsions.
  • Isostaticity and force heterogeneity increase as jamming is approached.

Conclusions:

  • Jamming transition exhibits universal scaling behaviors in both emulsions and granular materials.
  • Preparation history significantly influences granular material jamming, but not emulsion jamming.
  • Force distribution heterogeneity is a key indicator of the jamming transition, independent of structural properties.

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