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Related Experiment Video

Updated: May 17, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Force-induced diffusion in microrheology.

Ch J Harrer1, D Winter, J Horbach

  • 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 2, 2012
PubMed
Summary
This summary is machine-generated.

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Active nonlinear microrheology reveals how tracer particles move in glass-forming suspensions under force. A new model explains transient dynamics and transverse diffusion, showing particle motion before steady state is reached.

Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Condensed matter physics

Background:

  • Glass-forming suspensions exhibit complex dynamics under external forces.
  • Active nonlinear microrheology probes particle motion in dense fluids.
  • Understanding transient dynamics is crucial for characterizing material properties.

Purpose of the Study:

  • To investigate the force-induced diffusive motion of a tracer particle in a glass-forming suspension.
  • To extend a mode-coupling theory model for active nonlinear microrheology.
  • To analyze transient dynamics and transverse diffusion under strong external forces.

Main Methods:

  • Extension of a schematic mode-coupling theory model.
  • Analysis of molecular-dynamics simulation data.

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The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

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Last Updated: May 17, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
11:38

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Published on: April 19, 2018

In Situ Mapping of the Mechanical Properties of Biofilms by Particle-tracking Microrheology
12:58

In Situ Mapping of the Mechanical Properties of Biofilms by Particle-tracking Microrheology

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The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

  • Investigation of transient particle displacements and diffusion coefficients.

    • Main Results:

    • The model captures non-trivial transient displacements before steady-state velocity.
    • External forces induce diffusive motion perpendicular to the force axis.
    • A relationship between transverse diffusion and nonlinear friction is addressed.
    • Molecular dynamics simulations show non-diffusive fluctuations at long times.

    Conclusions:

    • The extended model accurately describes transient dynamics in active nonlinear microrheology.
    • The study provides insights into the relationship between transverse diffusion and nonlinear friction.
    • The model predicts a crossover to long-time diffusion, consistent with simulations.