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Fragmenting Bulk Hydrogels and Processing into Granular Hydrogels for Biomedical Applications
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Jamming in granular polymers.

L M Lopatina1, C J Olson Reichhardt, C Reichhardt

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

Granular polymer systems jam at lower densities when chain length increases, forming loops. Mixtures with rings further reduce jamming density, differing from disk systems and suggesting multiple jamming types.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • The jamming transition is a fundamental phenomenon in condensed matter physics, occurring when a system of particles transitions from a fluid-like to a solid-like state.
  • Granular materials, composed of macroscopic particles, exhibit complex behaviors including jamming, which is crucial for understanding their mechanical properties.
  • Recent experiments have explored jamming in granular polymers, but a comprehensive theoretical understanding, particularly concerning the influence of structure, is still developing.

Purpose of the Study:

  • To investigate the jamming transition in two-dimensional granular polymer systems using computational simulations.
  • To determine how granular chain length and the presence of granular rings affect jamming density.
  • To compare the jamming behavior of granular polymers with that of granular disk systems and explore the diversity of jamming transitions.

Main Methods:

  • Employing compressional simulations to model the jamming transition in granular polymer systems.
  • Analyzing the impact of varying granular chain lengths on jamming density (Φ(c)).
  • Simulating mixtures of granular chains and granular rings to observe effects on jamming density.

Main Results:

  • Jamming density (Φ(c)) decreases with increasing granular chain length, attributed to the formation of loop structures.
  • Jamming density is further reduced in mixtures of granular chains and granular rings, consistent with experimental observations.
  • The jamming behavior in granular polymer systems exhibits significant differences compared to polydisperse two-dimensional disk systems at point J.

Conclusions:

  • The formation of loop structures in longer granular chains is responsible for the reduced jamming density.
  • The inclusion of granular rings provides an additional mechanism to lower the jamming density in granular polymer systems.
  • The distinct jamming characteristics of granular polymers, compared to granular disks, provide evidence for the existence of multiple jamming transition types.