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This study reveals a new source of shear stress in active matter suspensions, explaining both shear thickening and thinning behaviors. This finding goes beyond traditional models based solely on hydrodynamic interactions.

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Area of Science:

  • Physics of complex fluids
  • Soft matter physics
  • Rheology of active matter

Background:

  • Active matter suspensions exhibit complex rheology, typically attributed to hydrodynamic interactions from self-propulsion.
  • Existing models often link non-Newtonian behavior to nematic ordering of microswimmers.

Purpose of the Study:

  • To identify additional contributions to shear stress in active matter suspensions.
  • To develop a model predicting shear thickening and thinning independent of hydrodynamic interactions and nematic ordering.

Main Methods:

  • Development of a micromechanical model for active Brownian particles in shear flow.
  • Analysis of the swim stress tensor, including off-diagonal shear components.

Main Results:

  • Discovery of an intrinsic contribution to suspension shear stress, independent of fluid disturbances.
  • The model predicts both shear thickening and thinning behaviors without requiring nematic ordering.
  • Theoretical predictions align with existing experimental data for active suspension viscosity.

Conclusions:

  • Hydrodynamic interactions are not the sole determinant of active suspension rheology.
  • A new micromechanical framework explains observed shear thickening/thinning and predicts novel behaviors.
  • This work advances the understanding of active matter rheology beyond conventional fluid dynamics models.