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Size-dependent diffusion in an aging colloidal glass.

D R Strachan1, G C Kalur, S R Raghavan

  • 1Center for Superconductivity Research, University of Maryland, College Park, MD 20742, USA. drstrach@sas.upenn.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 23, 2006
PubMed
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Colloidal Laponite dispersions age into glasses. Probe particle diffusion reveals an effective temperature, indicating out-of-equilibrium behavior at short timescales and thermalization at longer ones.

Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Rheology

Background:

  • Colloidal dispersions, like Laponite, exhibit aging from liquid-like sols to solid-like glasses.
  • Understanding the dynamics of these aging systems is crucial for materials science and soft matter physics.
  • Probe particle diffusion is a key technique for characterizing internal dynamics.

Purpose of the Study:

  • To investigate the aging process of Laponite colloidal dispersions.
  • To explore the relationship between probe particle diffusion and the system's effective temperature.
  • To examine the validity of the fluctuation-dissipation theorem in out-of-equilibrium colloidal systems.

Main Methods:

  • Dynamic Light Scattering (DLS) to monitor probe particle diffusion.

Related Experiment Videos

  • Simultaneous dynamic rheological measurements.
  • Analysis of time-dependent diffusion scaling with particle size.

    • Main Results:

    • Probe particle diffusion scales with size at early aging times.
    • An effective temperature was identified, increasing with aging time and frequency.
    • Two distinct time-scale regimes were observed in the Laponite system.

    Conclusions:

    • The study provides insights into the out-of-equilibrium dynamics of aging colloidal glasses.
    • At short timescales, the system exhibits an effective temperature exceeding the bath temperature.
    • At longer timescales, the Laponite dispersion appears to thermalize with the surrounding bath.