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Dynamical states in driven colloidal liquid crystals.

Ellen Fischermeier1, Matthieu Marechal1, Klaus Mecke1

  • 1Institut für Theoretische Physik, Friedrich-Alexander Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany.

The Journal of Chemical Physics
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Summary
This summary is machine-generated.

We simulated colloidal liquid crystals made of hard spherocylinders. An external rotating field induced novel nonequilibrium states, mapped by particle orientation and single-particle dynamics.

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Area of Science:

  • Soft matter physics
  • Colloidal science
  • Nonlinear dynamics

Background:

  • Colloidal liquid crystals exhibit complex behaviors.
  • External fields can induce novel phases and dynamics.
  • Understanding nonequilibrium states is crucial for materials science.

Purpose of the Study:

  • To investigate the collective nonequilibrium states of hard spherocylinders under a rotating external field.
  • To characterize induced states using particle orientation and dynamics.
  • To construct a dynamical phase diagram based on driving frequency and particle concentration.

Main Methods:

  • Langevin dynamics simulations were employed.
  • The system studied was a model colloidal liquid crystal of hard spherocylinders.
  • Time-resolved orientational distributions and single-particle behavior were analyzed.

Main Results:

  • A variety of collective nonequilibrium states were induced by the rotating external field.
  • The origin of these states was explained by analyzing single-particle behavior.
  • A dynamical state diagram was constructed by varying external driving frequency and packing fraction.

Conclusions:

  • External rotating fields can drive colloidal liquid crystals into diverse nonequilibrium states.
  • Single-particle dynamics are key to understanding collective behavior in these driven systems.
  • The constructed phase diagram provides a map for controlling and predicting emergent states.