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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Shear-induced crystallization in jammed systems.

Nathan Duff1, Daniel J Lacks

  • 1Department of Chemical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 16, 2007
PubMed
Summary

Oscillating shear strain induces significant crystallization in jammed particle systems. This finding holds across various simulation methods, suggesting a robust physical mechanism for shear-induced ordering.

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Area of Science:

  • Physics
  • Materials Science
  • Computational Science

Background:

  • Jammed systems of spherical particles exhibit complex behaviors under external forces.
  • Understanding particle dynamics and phase transitions is crucial for materials design.

Purpose of the Study:

  • To investigate the impact of oscillating shear strain on jammed particle systems.
  • To determine the critical strain amplitude for inducing crystallization.
  • To propose a mechanism for shear-induced crystallization.

Main Methods:

  • Utilized molecular dynamics and athermal dynamics simulations.
  • Employed soft and hard potentials, with and without attractive forces.
  • Included systems with and without surrounding walls for robustness.
  • Monitored crystallization using the Q(6) order parameter, potential energy, and radial distribution function.

Main Results:

  • Shear oscillations exceeding a few percent amplitude led to substantial crystallization.
  • Results were consistent across diverse simulation methodologies, confirming robustness.
  • A fold catastrophe mechanism on the free-energy landscape was proposed to explain the phenomenon.

Conclusions:

  • Oscillating shear strain is an effective trigger for crystallization in jammed particle systems.
  • The observed crystallization is a general phenomenon, independent of specific simulation details.
  • The proposed fold catastrophe mechanism provides insight into shear-induced ordering.