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Two-step yielding in a jammed microgel suspension.

Fayis Kanheerampockil^1,2,3, Rachna Maria Kurian¹, Gary Bryant³

¹Polymer Science and Engineering Division CSIR-National Chemical Laboratory, Pune, Maharashtra 411008, India. sk.bhat.ncl@csir.res.in.

|June 16, 2026

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Soft core-shell microgels exhibit unique two-step yielding behavior in jammed states. This phenomenon, driven by particle softness and structure, involves distinct stages of deformation and flow under shear stress.

Area of Science:

Soft Matter Physics
Rheology
Colloidal Science

Background:

Colloidal glasses exhibit complex yielding behaviors under deformation.
Understanding yielding mechanisms is crucial for material design and application.

Purpose of the Study:

To elucidate the mechanism of two-step yielding in repulsive colloidal microgel glasses.
To investigate the influence of particle softness and structure on yielding.

Main Methods:

Shear deformation experiments including strain sweep and start-up flow.
Creep-recovery tests and Lissajous-Bowditch curves to analyze nonlinearities.
Systematic variation of microgel volume fraction and particle architecture.

Main Results:

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Two-step yielding was observed specifically in soft core-shell microgels within the jammed glass regime.
Stiff core-shell and homogeneous microgels did not exhibit two-step yielding.
Strain stiffening between yield points is attributed to interpenetrated polymer chain interlocking.

Conclusions:

Softness and core-shell structure are essential for two-step yielding in microgel glasses.
The yielding process involves resistance to cage breaking followed by macroscopic flow.
Microgel deformation and compression play a key role in the observed rheological response.