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Related Experiment Videos

Spatially heterogeneous dynamics in supercooled liquids.

M D Ediger1

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. ediger@chem.wisc.edu

Annual Review of Physical Chemistry
|October 14, 2000
PubMed
Summary

Supercooled liquids exhibit spatial heterogeneity, with some regions dynamically faster than others. This review details experimental findings on the scale, duration, and origins of these dynamic variations in liquids.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • Supercooled liquids are known to exhibit complex dynamics.
  • Previous research suggested potential spatial heterogeneity in liquid dynamics.

Purpose of the Study:

  • To review experimental evidence for spatial heterogeneity in supercooled liquids.
  • To address key questions regarding the characteristics and origins of this heterogeneity.

Main Methods:

  • Experimental characterization of dynamic heterogeneity in supercooled liquids.
  • Analysis of dynamics across different spatial scales (nanometers).

Main Results:

  • Clear experimental evidence confirms significant spatial variations in dynamics.

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  • Dynamics can differ by orders of magnitude between adjacent regions.
  • Heterogeneities are characterized by their size, lifetime, and extent of dynamic variation.

    • Conclusions:

    • Spatial heterogeneity is a key feature of supercooled liquid dynamics.
    • Understanding these heterogeneities is crucial for applications of glass-forming materials.
    • Further research is needed to fully elucidate the origins and implications of dynamic heterogeneity.