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Summary
This summary is machine-generated.

We simulated active liquid crystals, finding interface velocity depends on activity type. Contractile systems expand the nematic phase, while extensile systems contract it, revealing new dynamics.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Liquid Crystal Dynamics

Background:

  • Active liquid crystals exhibit complex phase behaviors.
  • Understanding the nematic-isotropic interface is crucial for active matter studies.
  • Confined geometries influence hydrodynamic properties.

Purpose of the Study:

  • Investigate the hydrodynamic behavior of the nematic-isotropic interface in confined active liquid crystals.
  • Characterize the impact of activity (contractile vs. extensile) on interfacial dynamics.
  • Explore the role of temperature and activity in phase stability and defect formation.

Main Methods:

  • Numerical simulations employing a hybrid model.
  • Finite difference method combined with the lattice Boltzmann method.
  • Multi-relaxation-time collision operator for enhanced accuracy.

Main Results:

  • Stable interface observed at low activities; velocity scales linearly with contractile activity and quadratically with extensile activity.
  • Nematic phase expands for contractile and contracts for extensile systems due to active forces.
  • Interfacial instability and defect nucleation observed at higher activities for extensile systems.

Conclusions:

  • Active forces at the interface dictate phase expansion/contraction.
  • Temperature tuning allows observation of static interfaces and defines coexistence.
  • Defect dynamics in extensile systems show regular, persistent behavior within specific activity ranges.