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Increasing friction in sphere packings creates a structural prepeak, indicating intermediate-range order. This finding relates to local coordination number fluctuations in jammed granular materials.

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Area of Science:

  • Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Understanding the structural properties of jammed granular materials is crucial for various scientific and engineering applications.
  • The static structure factor provides insights into the spatial arrangement of particles in disordered systems.

Purpose of the Study:

  • To investigate the structural signatures within the low-to-intermediate wave number region of the static structure factor.
  • To elucidate the role of friction in the formation of structural order in large-scale jammed sphere packings.

Main Methods:

  • Utilized discrete element method (DEM) simulations with up to 8x10^7 particles.
  • Varied particle friction coefficients, including sliding, rolling, and twisting interactions.
  • Analyzed the static structure factor and correlated it with real-space structural properties.

Main Results:

  • Observed the emergence of a prepeak in the static structure factor at intermediate wave numbers, signifying intermediate-range order.
  • This prepeak grows with increasing particle friction coefficient.
  • Correlated the prepeak's emergence with fluctuations in the local coordination number, a characteristic of the packing's granular nature.

Conclusions:

  • Friction plays a key role in establishing intermediate-range order in jammed sphere packings.
  • The observed prepeak is linked to inherent fluctuations in local particle arrangements.
  • Packing preparation history can influence large-scale structural properties, offering potential for controlled material design.