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Related Experiment Videos

Demixing transition in a quasi-two-dimensional surface-frozen layer.

E Sloutskin1, O Gang, H Kraack

  • 1Physics Department, Bar Ilan University, Ramat Gan 52900, Israel.

Physical Review Letters
|August 23, 2002
PubMed
Summary

A solid-solid phase transition occurred in a 2D crystalline bilayer due to temperature-driven composition changes. Molecular exchange with the liquid bulk enabled this rare phenomenon in surface-frozen alcohol mixtures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Surface-frozen crystalline bilayers form on molten binary mixtures of long alcohols.
  • Observing solid-solid phase transitions in quasi-2D systems is challenging.
  • Understanding interfacial phenomena is crucial for materials development.

Purpose of the Study:

  • To investigate the nature of a thin/thick transition in a surface-frozen crystalline bilayer.
  • To elucidate the mechanism behind this rare solid-solid phase transition.
  • To develop a thermodynamic model explaining the observed transition.

Main Methods:

  • X-ray reflectivity was used to observe the thin/thick transition.
  • Experimental observations were analyzed using mean-field thermodynamics.

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  • The role of molecular exchange between the bilayer and the bulk liquid was investigated.

    • Main Results:

    • A distinct thin/thick transition was observed in the crystalline bilayer.
    • The transition was attributed to an abrupt, temperature-driven change in bilayer composition.
    • Kinetically, the transition was facilitated by molecular exchange with the underlying liquid.
    • A Gibbs-adsorption-like thermodynamic expression accurately described the transition.

    Conclusions:

    • The study presents a rare solid-solid phase transition in a quasi-2D system.
    • Temperature-driven compositional changes, enabled by bulk molecular exchange, drive the transition.
    • Mean-field thermodynamics provides a robust framework for understanding such interfacial transitions.