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Updated: Jul 20, 2025

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

Yusuke Hara1, Hideyuki Mizuno1, Atsushi Ikeda1,2

  • 1Graduate School of Arts and Science, The University of Tokyo, Komaba, Tokyo 153-8902, Japan. hara-yusuke729@g.ecc.u-tokyo.ac.jp.

Soft Matter
|August 1, 2023
PubMed
Summary
This summary is machine-generated.

The generalized Stokes relation (GSR) accurately describes microrheology in jammed soft materials, even near the jamming transition. This finding validates microrheology as a powerful tool for studying these complex systems.

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Area of Science:

  • Soft Matter Physics
  • Nonlinear Dynamics
  • Materials Science

Background:

  • The jamming transition is a critical phenomenon governing the mechanical properties of soft materials like pastes and emulsions.
  • Conventional macrorheology reveals frequency-dependent complex modulus in jammed materials.
  • Microrheology offers a probe-based method to measure complex modulus via the generalized Stokes relation (GSR), but its theoretical basis near jamming is unclear.

Purpose of the Study:

  • To theoretically and numerically investigate the validity of the GSR in microrheology of jammed particles near the jamming transition.
  • To determine if microrheology can accurately capture the mechanical properties of jammed soft materials.
  • To explore the scaling laws of storage and loss modulus in microrheology and compare them with macrorheology.

Main Methods:

  • Development of a linear response formalism to compute probe particle response functions.
  • Transformation of probe response to complex modulus using the generalized Stokes relation (GSR).
  • Application of the formalism to a numerical model of jammed particles and asymptotic analysis.

Main Results:

  • The storage and loss modulus exhibit characteristic scaling laws near the jamming transition.
  • The observed scaling laws in microrheology match those obtained from macrorheology.
  • The generalized Stokes relation (GSR) is confirmed to be valid even close to the jamming transition.

Conclusions:

  • Microrheology, using the generalized Stokes relation (GSR), accurately characterizes the mechanical properties of jammed soft materials near the jamming transition.
  • The study validates microrheology as a reliable technique for investigating complex materials exhibiting jamming.
  • The findings bridge the gap in theoretical understanding of microrheology in critical phenomena.