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Dynamical heterogeneities and defects in two-dimensional soft colloidal crystals.

B van der Meer1, W Qi1, J Sprakel2

  • 1Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. B.vanderMeer@uu.nl m.dijkstra@uu.nl.

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|October 6, 2015
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Summary
This summary is machine-generated.

Simulations reveal heterogeneous dynamics in charged colloidal systems. Mobile defects, like cooperative particle loops and diffusing vacancy-interstitial pairs, drive rearrangements in hexatic and solid phases.

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Area of Science:

  • Condensed matter physics
  • Soft matter physics
  • Computational physics

Background:

  • Two-dimensional systems of charged colloidal particles exhibit complex phase behavior.
  • Understanding particle dynamics is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the phase diagram and dynamics of a 2D charged colloidal system.
  • To identify mechanisms responsible for heterogeneous dynamics in stable hexatic and solid phases.

Main Methods:

  • Brownian dynamics simulations were employed.
  • Phase diagrams were determined.
  • Dynamics and defect mechanisms were analyzed quantitatively.

Main Results:

  • Heterogeneous dynamics were observed in hexatic and solid phases.
  • Two primary mechanisms for high mobility were identified: cooperative particle loops and spontaneous vacancy-interstitial pair creation.
  • String-size distributions in the crystal phase were modeled using a random walk description.

Conclusions:

  • Cooperative particle motion and mobile defects are key to rearrangements in 2D colloidal systems.
  • The dynamics in these phases are characterized by defect-mediated processes.
  • Simple models can describe defect behavior in crystalline colloidal systems.