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Area of Science:

  • Colloid and interface science
  • Soft matter physics
  • Materials engineering

Background:

  • Motility-induced phase separation (MIPS) is a key phenomenon in active colloidal suspensions, yet its mechanical properties are not well understood.
  • Active systems, unlike equilibrium systems, exhibit unique behaviors driven by self-propulsion.
  • Understanding rheology is vital for harnessing active suspensions in materials science.

Purpose of the Study:

  • To investigate the rheological behavior of active colloidal suspensions under shear.
  • To explore how MIPS influences the mechanical properties of these systems.
  • To compare the rheology of active MIPS with passive systems.

Main Methods:

  • Simulations of pseudohard active Brownian particles under constant and oscillatory shear.
  • Analysis of storage and loss moduli across various densities and activity levels.
  • Comparison with passive particle systems in liquid-gas coexistence.

Main Results:

  • Active suspensions exhibiting MIPS behave as viscoelastic Maxwell-like fluids.
  • Shear thinning is observed across a broad range of densities and activities.
  • The crossover frequency shows a nonmonotonic dependence on activity, differing from passive systems.

Conclusions:

  • Active forces and out-of-equilibrium phases significantly impact the mechanical properties of suspensions.
  • The rheological response of MIPS systems is distinct from passive analogs.
  • This work provides crucial insights into the mechanics of active matter for materials applications.