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Transient dynamics during stress overshoots in binary colloidal glasses.

T Sentjabrskaja1, M Hermes, W C K Poon

  • 1Condensed Matter Physics Laboratory, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany. marco.laurati@uni-duesseldorf.de.

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We studied how binary colloidal glasses transition from solid-like to flow behavior. The stress overshoot magnitude and yield strain depend on particle mixing, revealing distinct flow regimes under shear.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Rheology

Background:

  • Colloidal glasses exhibit complex rheological behavior under shear.
  • Understanding the relationship between microscopic dynamics and macroscopic flow is crucial.
  • Binary mixtures with large dynamical asymmetry present unique challenges in characterizing yielding.

Purpose of the Study:

  • To investigate the time-dependent stress response and particle dynamics in binary colloidal glasses after a shear rate step change.
  • To link macroscopic stress overshoot and yielding to microscopic dynamics and cage effects.
  • To explore how mixing ratios influence these phenomena and identify distinct flow regimes.

Main Methods:

  • Simultaneous rheology and confocal microscopy were employed.
  • Step changes in shear rate were applied to binary colloidal glasses.
  • Single-particle dynamics and stress relaxation were tracked over time.

Main Results:

  • A stress overshoot characterizes the transition from solid-like to flow, linked to superdiffusive dynamics and cage compression.
  • Yield strain and overshoot magnitude vary with mixing ratio, reflecting changes in the caging mechanism.
  • Yielding and stress storage are governed by different time and length scales (short-time in-cage vs. long-time structural relaxation).

Conclusions:

  • Two distinct regimes of shear rate dependence for yield strain and stress overshoot magnitude were identified.
  • The interplay between in-cage dynamics, structural relaxation, and applied shear rate dictates the macroscopic response.
  • Mixing ratio is a critical parameter controlling the yielding behavior and flow properties of these colloidal glasses.