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Autonomously Probing Viscoelasticity in Disordered Suspensions.

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This summary is machine-generated.

Self-propelled microrheological probes show enhanced rotational diffusion in colloidal glasses. Simulations reveal this effect stems from active motion converted to rotation by probe-medium friction, linked to the medium's structure.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Rheology

Background:

  • Active microrheology probes self-propelled motion in complex fluids.
  • Colloidal glasses exhibit unique dynamic behaviors.
  • Rotational diffusion is a key transport mechanism.

Purpose of the Study:

  • To provide a microscopic understanding of rotational diffusion enhancement in colloidal glasses.
  • To investigate the role of probe-medium interactions in active microrheology.
  • To explain experimental observations of enhanced diffusion.

Main Methods:

  • Molecular dynamics simulations of a frictional probe in a colloidal glass.
  • Analysis of probe translation-to-rotation conversion.
  • Examination of the relationship between diffusion and medium structure.

Main Results:

  • Simulations reproduce experimental observations of enhanced rotational diffusion.
  • Frictional coupling between the probe and medium converts active translation into rotation.
  • Diffusive enhancement is linked to the disordered structure of the colloidal glass.
  • A peak in enhancement correlates with a second-order transition in contact number.

Conclusions:

  • The study provides a microscopic mechanism for enhanced rotational diffusion in active microrheology.
  • The findings explain experimental results in colloidal glasses.
  • The effective description is applicable to various viscoelastic suspensions.