Unexpectedly stable clathrate hydrates formed from microporous vapor-deposited amorphous solid water at low 'external' guest pressures and their astrophysical implications

Details Unexpectedly stable clathrate hydrates formed from microporous vapor-deposited amorphous solid water at low 'external' guest pressures and their astrophysical implications Unexpectedly stable clathrate hydrates formed from microporous vapor-deposited amorphous solid water at low 'external' guest pressures and their astrophysical implications

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...90..176h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 90, March 1991, p. 176-180. FFWF-supported research.

Computer Science

5

Amorphous Materials, Clathrates, Ice Formation, Reaction Kinetics, Solar System, Temperature Dependence, Microporosity, Vapor Deposition, X Ray Diffraction

Scientific paper

The formation of O2-clathrate hydrate from O2 trapped in micropores of vapor-deposited amorphous water ice during heating and sintering at temperatures up to 120 K and 'external' O2 pressures 10, 100, 200, and 1000 mbar is reported. X-ray diffraction studies show that the clathrate hydrate forms at 170-210 K, even at the lowest O2 pressure (10 mbar) and does not decompose until the temperature reaches 240-250 K (significantly higher than predicted previously). The importance of the presence and sintering properties of micropores in amorphous water ice for theoretical models of clathrate hydrate formation in the solar system is indicated.

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