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Jammed elastic shells - a 3D experimental soft frictionless granular system.

Jissy Jose1, Gerhard A Blab, Alfons van Blaaderen

  • 1Soft Condensed Matter, Debye Institute for NanoMaterials Science, Utrecht University, Princetonplein 1, 3584 CC, Utrecht, The Netherlands. j.jose@uu.nl A.Imhof@uu.nl.

Soft Matter
|January 23, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a novel experimental system for 3D jammed matter using elastic shells. Findings reveal deviations in scaling laws for contact and buckling numbers near the jamming transition.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Jammed matter exhibits complex structures and force networks.
  • Understanding scaling laws in jammed systems is crucial for predicting material behavior.

Purpose of the Study:

  • To develop and utilize a new experimental system for characterizing 3D jammed matter.
  • To investigate universal scaling laws and force networks in these systems.
  • To analyze the structure and properties of jammed elastic shells.

Main Methods:

  • Utilized monodisperse, soft, frictionless, fluorescent-labeled elastic shells.
  • Employed confocal microscopy to capture 3D image stacks.
  • Developed an image processing routine in ImageJ for sub-pixel coordinate determination.
  • Analyzed shell buckling and contact mechanics.

Main Results:

  • Obtained precise 3D particle coordinates and identified buckling shells.
  • Characterized amorphous structure using radial distribution function, bond order parameters, and contact numbers.
  • Introduced and measured the 'buckling number' as a unique system property.
  • Observed power law scaling deviations for contact number with excess volume fraction.

Conclusions:

  • The experimental system provides accurate characterization of 3D jammed matter.
  • Scaling laws for contact number differ from theoretical and simulation predictions.
  • Buckling number exhibits similar scaling behavior to contact number near the jamming transition.