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Amorphous water.

C Austen Angell1

  • 1Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA. CAA@asu.edu

Annual Review of Physical Chemistry
|May 1, 2004
PubMed
Summary
This summary is machine-generated.

Water can exist in multiple amorphous states, exhibiting unique glassy properties and low disorder. Research explores these distinct forms and their transformations, revealing insights into glassy water's ideal characteristics.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Water can be prepared in various amorphous states, suggesting more than one distinct form exists.
  • Structural and spectroscopic characterization reveals at least two distinct amorphous states of water.
  • Amorphous solid water (ASW) exhibits unusual glassy features, including low disorder and low excess entropy.

Purpose of the Study:

  • To summarize methods for preparing amorphous water.
  • To characterize distinct amorphous water states and their properties.
  • To review the polyamorphism and transformations of glassy water.

Main Methods:

  • Review of preparation techniques for amorphous water.
  • Structural and spectroscopic analysis of different amorphous states.

Related Experiment Videos

  • Examination of low-frequency vibrational, thermodynamic, and relaxational properties.

    • Main Results:

    • Evidence for at least two distinct amorphous states of water, potentially mimicking crystalline polymorphs.
    • Amorphous solid water (ASW) displays characteristics of an unusually ideal glass, with low excess entropy.
    • The ideal glassy nature of ASW is linked to its lack of a well-defined glass transition temperature.

    Conclusions:

    • Glassy water exhibits polyamorphism, with distinct forms and transformation kinetics.
    • Amorphous solid water (ASW) represents a nearly ideal glass, challenging conventional understanding.
    • Further research into ASW's unique properties can advance the study of glassy materials.