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Fluctuation-dissipation theorem in an aging colloidal glass.

Sara Jabbari-Farouji1, Daisuke Mizuno, Maryam Atakhorrami

  • 1Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE Amsterdam, the Netherlands.

Physical Review Letters
|March 16, 2007
PubMed
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This study experimentally validates the fluctuation-dissipation theorem (FDT) in aging colloidal glass. Researchers found no deviations from FDT across various frequencies and aging times, confirming its applicability in nonequilibrium systems.

Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Colloidal science

Background:

  • The fluctuation-dissipation theorem (FDT) relates correlation and response functions in equilibrium systems.
  • Aging colloidal glasses represent a complex, nonequilibrium system where FDT's applicability is debated.
  • Previous studies have reported potential deviations from FDT in such systems.

Purpose of the Study:

  • To experimentally test the validity of the fluctuation-dissipation theorem (FDT) in aging colloidal glass.
  • To independently measure correlation and response functions in a nonequilibrium setting.
  • To investigate the viscoelastic properties of aging colloidal systems.

Main Methods:

  • Combined active and passive microrheology techniques were employed.

Related Experiment Videos

  • Correlation functions were measured to capture system's equilibrium-like fluctuations.
  • Response functions were measured to probe the system's reaction to external stimuli.

    • Main Results:

    • No deviations from the fluctuation-dissipation theorem (FDT) were observed.
    • The FDT held true over several decades of frequency (1 Hz-10 kHz).
    • Two distinct viscoelastic contributions were identified in the aging glass, including a low-frequency elastic response that increases with aging time.

    Conclusions:

    • The fluctuation-dissipation theorem (FDT) is experimentally validated in aging colloidal glass.
    • The findings confirm the FDT's applicability even in complex, aging, nonequilibrium systems.
    • The study reveals insights into the aging dynamics and viscoelasticity of colloidal glasses.