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Updated: Jan 11, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Rheological response of soft solid/liquid composites.

Elina Gilbert1,2, Anniina Salonen3, Christophe Poulard1

  • 1UMR8502 Laboratoire de Physique des Solides, Université Paris-Saclay, 1 rue Nicolas Appert, bâtiment 510, 91400 Orsay, France. christophe.poulard@universite-paris-saclay.fr.

Soft Matter
|November 10, 2025
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Summary
This summary is machine-generated.

This study on soft composites reveals that increasing liquid droplet volume fraction enhances viscous dissipation proportionally with frequency. The elastic response of the material remains largely unaffected by these changes.

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Area of Science:

  • Materials Science
  • Rheology
  • Polymer Physics

Background:

  • Understanding material dissipative response is crucial for applications like adhesion and fracture resistance.
  • The complex interplay between matrix and inclusions in dispersions complicates rheological descriptions.
  • Fractional rheology and superposition methods are effective for modeling complex material behavior.

Purpose of the Study:

  • To investigate the rheological properties of soft solid/liquid composites.
  • To analyze the influence of liquid inclusions on the dissipative and elastic responses of a soft matrix.
  • To apply fractional rheology and time-concentration superposition to understand composite behavior.

Main Methods:

  • Studied soft composites of liquid poly(ethylene glycol) (PEG) droplets in a poly(dimethylsiloxane) (PDMS) matrix.
  • Utilized fractional rheology to model the storage and loss moduli.
  • Employed time-concentration superposition in the continuous-phase-dominated region.

Main Results:

  • Viscous dissipation increases proportionally with the volume fraction of PEG droplets.
  • The increase in viscous dissipation is independent of frequency.
  • The elastic response of the PDMS matrix is minimally affected by the presence of PEG droplets.

Conclusions:

  • Fractional rheology effectively captures the behavior of these soft composites.
  • The volume fraction of inclusions significantly impacts viscous dissipation but not elastic properties.
  • This work provides insights into the rheology of soft matter composites for various applications.