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Related Experiment Videos

Colloid flow during thickening--a particle level understanding for core-shell particles.

John R Melrose1

  • 1Polymers and colloids group, Cavendish laboratory, University of Cambridge, Madingley Road, Cambridge, UK CB3 0HE. John.Melrose@Unilever.com

Faraday Discussions
|March 18, 2003
PubMed
Summary

Shear thickening in concentrated colloids is linked to particle contact networks. This study explores contact lifetimes and network structure, revealing insights into the mechanisms behind this phenomenon.

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Brownian dynamics simulations of aging colloidal gels.

Physical review. E, Statistical, nonlinear, and soft matter physics·2005
See all related articles

Area of Science:

  • Colloid Science
  • Rheology
  • Computational Physics

Background:

  • Concentrated colloidal suspensions exhibit shear thickening, a phenomenon with complex underlying mechanisms.
  • Previous research identified a contact network between polymer coats as key to shear thickening.
  • A mean-field argument links particle interactions to thickening, but an unknown factor related to contact destruction remains.

Purpose of the Study:

  • To further understand the particle-level mechanisms of shear thickening in concentrated colloids.
  • To investigate the structure and coordination of the particle contact network.
  • To analyze the lifetimes of particle contacts and their role in the shear thickening regime.

Main Methods:

  • Simulations using Stokesian dynamics for high concentrations.

Related Experiment Videos

  • Analysis of the fabric and texture of the particle contact network.
  • Examination of particle contact lifetimes and stress fluctuations.

    • Main Results:

    • The study contrasts systems with varying polymer coat thicknesses.
    • Tentative evidence suggests the network structure approaches isostatic coordination.
    • Analysis of contact lifetimes reveals some pairs have surprisingly long durations.
    • Data on stress fluctuations in the thickening regime is presented.

    Conclusions:

    • The formation and coordination of particle contact networks are crucial for shear thickening.
    • The lifetimes of particle contacts play a significant role, challenging simple pair arguments.
    • Further investigation into contact dynamics and network evolution is warranted for a complete understanding.