Journal
CHEMICAL PHYSICS LETTERS
Volume 492, Issue 1-3, Pages 1-8Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2010.03.072
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Funding
- NSF [CHE-0 809 480]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0809480] Funding Source: National Science Foundation
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One of the most vital properties of clathrate hydrates is the rate at which they form from ice or aqueous solutions, or undergo transformations to related structures. It has been established that these rates are often greatly accelerated when one guest species is inclined to form a hydrogen bond with the host lattice water molecules. Low-temperature studies of these accelerated rates suggest that quite phenomenal rates should be observed near 200 K. Here, a method of testing rates of formation of CHs at similar to 200 K is described. Complete conversion of all available water to CHs on a millisecond timescale has been observed by FTIR spectroscopy as temperatures of warm vapor mixtures drop rapidly to similar to 100 K in a cold condensation cell. That CH formation completely overrides ice nucleation and crystallization is indicative of the rapidity of the process under the new set of extreme conditions. (C) 2010 Elsevier B.V. All rights reserved.
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