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Yield Stress Aging in Attractive Colloidal Suspensions.

Francesco Bonacci1, Xavier Chateau2, Eric M Furst3

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Summary
This summary is machine-generated.

Yield stress aging in colloidal suspensions is driven by interparticle contacts that resist rolling. This rolling threshold increases over time, controlling suspension properties and enabling new constitutive relations.

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Area of Science:

  • Colloid and Interface Science
  • Materials Physics
  • Rheology

Background:

  • Yield stress aging is a common phenomenon in colloidal suspensions.
  • The underlying mechanisms, particularly the role of interparticle contacts, are not fully understood.
  • Understanding aging is crucial for predicting the long-term behavior of suspensions.

Purpose of the Study:

  • To investigate the origin of yield stress aging in specific colloidal systems.
  • To elucidate the role of interparticle contacts in the aging process.
  • To establish constitutive relations between contact properties and macroscopic suspension behavior.

Main Methods:

  • Optical tweezer three-point bending tests on particle rods.
  • Analysis of contact yielding and rolling thresholds.
  • Development of constitutive relations at both contact and macroscopic scales.

Main Results:

  • Interparticle contacts resist rolling, and their yielding is characterized by a time-dependent rolling threshold.
  • The rolling threshold grows logarithmically with time.
  • A constitutive relation between contact flexural rigidity and rolling threshold was identified and shown to transfer to macroscopic scales.

Conclusions:

  • The time-dependent rolling threshold of interparticle contacts is the primary driver of yield stress aging in these suspensions.
  • A generic constitutive relation between macroscopic shear modulus and yield stress can be established for colloidal systems.
  • This work provides a fundamental understanding of aging mechanisms in soft matter systems.