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Related Experiment Videos

Transient phase-induced nucleation

Sirota1, Herhold

  • 1Exxon Research and Engineering Company, Corporate Research Science Laboratory, Route 22 East, Annandale, NJ 08801, USA.

Science (New York, N.Y.)
|January 23, 1999
PubMed
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Researchers observed a transient metastable rotator phase during hexadecane crystallization. This phase

Area of Science:

  • Materials Science
  • Crystallography
  • Physical Chemistry

Background:

  • Crystallization from supercooled melts is crucial for materials processing.
  • Understanding metastable phases is key to controlling final crystal structures.
  • Hexadecane's crystallization provides a model system for studying phase transitions.

Purpose of the Study:

  • To directly observe and characterize the transient metastable rotator phase in hexadecane.
  • To investigate the role of this transient phase in determining the limit of supercooling.
  • To elucidate the crystallization kinetics of n-alkanes and confirm the nature of the transient phase.

Main Methods:

  • Time-resolved synchrotron X-ray scattering was employed for direct observation.
  • Crystallization kinetics of a homologous series of n-alkanes were measured.

Related Experiment Videos

  • Thermodynamic stability analysis was used to understand supercooling limits.

    • Main Results:

    • A transient metastable rotator phase was directly observed during hexadecane crystallization.
    • The limit of supercooling is governed by the thermodynamic stability of this transient phase.
    • A crossover in crystallization kinetics from metastability to transient metastability was identified.

    Conclusions:

    • The transient metastable rotator phase plays a critical role in the crystallization of hexadecane.
    • The observed crossover in metastability explains the crystallization kinetics of n-alkanes.
    • Direct observation confirms the nature and significance of the transient phase in supercooling phenomena.