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  11. Properties Of Packings And Dispersions Of Superellipse Sector Particles

Properties of packings and dispersions of superellipse sector particles

John Colt1, Lucas Nelson2, Sykes Cargile2

  • 1School of Physics and Astronomy, Rochester Institute of Technology, Rochester, New York 14623-5603, USA.

Physical Review. E
|March 16, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Superellipse sector particles (SeSPs) offer tunable shapes for granular systems. Packing fractions increase with aperture and decrease with corner sharpness, deviating from models due to orientation correlations.

Area of Science:

  • Physics
  • Materials Science
  • Computational Science

Background:

  • Superellipse sector particles (SeSPs) provide a versatile hard-particle shape model.
  • They allow continuous tuning of geometric parameters like corner sharpness and aspect ratio.
  • SeSPs can represent various shapes, including rods, circles, rectangles, and staples.

Purpose of the Study:

  • To investigate the packing behavior of superellipse sector particles (SeSPs).
  • To determine the dependence of random loose and close packing fractions on SeSP parameters.
  • To compare simulation results with theoretical models and explore particle arrangement dynamics.

Main Methods:

  • Utilized pair-wise Monte Carlo simulations to analyze geometric constraints.
  • Employed Monte Carlo simulations for many-particle dispersions.

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  • Conducted Molecular Dynamics simulations to generate random loose and close packings.

    • Main Results:

    • Packing fractions increase with opening aperture and decrease with corner sharpness.
    • Deviations from the random contact model were observed due to orientation correlations.
    • Spatio-orientational distribution area (SODA) plots revealed preferred particle configurations for dense packing.

    Conclusions:

    • SeSP packing density is sensitive to particle shape and preparation.
    • Correlations between particle orientation and spatial proximity significantly impact packing efficiency.
    • The study provides insights into the complex self-assembly of anisotropic particles.