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Motor crosslinking augments elasticity in active nematics.

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Active materials exhibit flows due to internal stresses. This study links microscopic properties of active nematics, like motor speed and crosslinking, to their emergent hydrodynamic behavior and elasticity.

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Area of Science:

  • Soft Matter Physics
  • Biophysics
  • Materials Science

Background:

  • Active materials generate flows from internal stresses.
  • Understanding mesoscopic behavior dependence on microscopic properties is crucial.
  • Knowledge gap exists in relating hydrodynamic parameters to microscopic element properties.

Purpose of the Study:

  • To connect the structure and dynamics of active nematics to their microscopic properties.
  • To investigate the role of motor processivity, speed, and valency.
  • To elucidate how microscopic features influence macroscopic behavior.

Main Methods:

  • Combined experimental approaches with multiscale modeling.
  • Studied active nematics composed of biopolymer filaments and molecular motors.
  • Varied motor kinetics and passive filament crosslinking.

Main Results:

  • Filament crosslinking by motors and passive agents dominates over excluded volume effects on nematic elasticity.
  • Motor speed and crosslinking exhibit a competitive, non-monotonic relationship with nematic flow.
  • Passive filament crosslinking significantly dictates energy transfer into nematic flow.

Conclusions:

  • Motor proteins are key in both generating activity and contributing to nematic elasticity.
  • Microscopic properties critically influence the emergent hydrodynamic and elastic behaviors of active nematics.
  • Findings offer insights for the rational engineering of active materials.