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Related Experiment Videos

Nucleation from a supercooled binary mixture studied by crossed polarizers.

Peter W Wilson1, A D J Haymet

  • 1University of Otago, Department of Physiology, P.O. Box 56, Dunedin, New Zealand. peterwwwilson@yahoo.com

The Journal of Physical Chemistry. A
|December 16, 2005
PubMed
Summary

Researchers used polarized light to study crystal formation in supercooled liquid mixtures. The experiments indicate that equilibrium clathrate hydrate crystals form directly, without a transient phase, in tetrahydrofuran/water mixtures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Crystallization Studies

Background:

  • Supercooled liquids can form different crystal phases during nucleation.
  • Understanding nucleation pathways is crucial for controlling material properties.
  • Binary mixtures, like tetrahydrofuran/water, offer complex systems for studying phase transitions.

Purpose of the Study:

  • To investigate the nucleation pathway of clathrate hydrate crystals in a supercooled binary liquid mixture.
  • To determine if a transient phase forms before the stable equilibrium crystal.
  • To compare heterogeneous nucleation in tetrahydrofuran/water with ice nucleation in pure water.

Main Methods:

  • Analysis of polarized light transmission through a supercooled binary liquid mixture (tetrahydrofuran/water).

Related Experiment Videos

  • Observation during the critical moment of crystal phase nucleation.
  • Comparison with nucleation in pure supercooled water.

    • Main Results:

    • Experimental results are consistent with direct nucleation of the equilibrium clathrate hydrate crystal.
    • No transient phase with different composition or broken symmetry was detected.
    • Heterogeneous nucleation in THF/water mirrors ice nucleation in pure water regarding direct formation.

    Conclusions:

    • The equilibrium clathrate hydrate crystal is directly nucleated in the THF/water system.
    • The time scale of the experiment did not reveal any intermediate transient phases.
    • This supports the hypothesis of direct nucleation pathways in certain supercooled mixtures.