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Forming, Confining, and Observing Microtubule-Based Active Nematics
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A nonequilibrium force can stabilize 2D active nematics.

Ananyo Maitra1, Pragya Srivastava2, M Cristina Marchetti3

  • 1LPTMS, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France; ananyo.maitra@u-psud.fr martin.lenz@u-psud.fr.

Proceedings of the National Academy of Sciences of the United States of America
|June 20, 2018
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Summary
This summary is machine-generated.

Active nematic suspensions on substrates can maintain orientational order at high activity due to a novel stabilizing force. This finding challenges existing theories and explains giant number fluctuations in active matter systems.

Keywords:
active matterconfined active nematicsliving liquid crystals

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter

Background:

  • Actively driven anisotropic objects exhibit nonequilibrium behaviors.
  • Current theories predict a loss of orientational order at high activity levels.

Purpose of the Study:

  • To investigate the possibility of sustained orientational order in nematic suspensions at high activity.
  • To identify the underlying mechanisms responsible for order in confined active matter.

Main Methods:

  • Theoretical modeling of active orientable fluids under geometric confinement.
  • Analysis of emergent forces and their stabilizing effects.

Main Results:

  • Nematic suspensions on a substrate can achieve order at arbitrarily high activity.
  • A previously unreported stabilizing active force emerges under confinement.
  • The ordered phase exhibits robust giant number fluctuations, even with incompressible solvents.

Conclusions:

  • The study reveals a new mechanism for orientational order in active nematic suspensions.
  • The findings challenge established theories on active matter behavior.
  • Results have broad implications for understanding self-propelled colloids, bacterial suspensions, and cytoskeletal dynamics.