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Preparation of amorphous solid water.

D S Olander1, S A Rice

  • 1Department of Chemistry, The University of Chicago, Chicago, Illinois 60637.

Proceedings of the National Academy of Sciences of the United States of America
|January 1, 1972
PubMed
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Researchers developed a new method to create solid amorphous water, a form of ice without any crystalline structures. This breakthrough provides the first completely pure amorphous solid water samples for scientific study.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Solid-State Physics

Background:

  • Amorphous solid water (ASW) is a metastable phase of water.
  • Previous methods for preparing ASW often resulted in contamination with crystalline ice phases.
  • The presence of crystalline ice can significantly alter the physical and chemical properties of ASW.

Purpose of the Study:

  • To report a novel method for the preparation of solid amorphous water.
  • To demonstrate the complete absence of crystalline ice in the prepared samples.
  • To provide a reliable source of pure amorphous solid water for future research.

Main Methods:

  • Development of a new deposition technique for water vapor onto a cryogenically cooled substrate.
  • Utilisation of advanced spectroscopic techniques (e.g., FTIR, Raman) to confirm the amorphous nature of the ice.

Related Experiment Videos

  • Employing X-ray diffraction to verify the absence of crystalline ice phases.

    • Main Results:

    • A reproducible method for preparing solid amorphous water was established.
    • Spectroscopic and diffraction analyses confirmed the samples were entirely free of crystalline ice.
    • The prepared amorphous solid water represents the first completely pure samples of this phase.

    Conclusions:

    • The reported method successfully produces pure amorphous solid water.
    • This advancement opens new avenues for studying the fundamental properties of amorphous water.
    • The availability of pure ASW is crucial for various scientific disciplines, including astrochemistry and materials science.