Nucleation and Growth of Hydrates on Ice Surfaces: New Insights from 129Xe NMR Experiments with Hyperpolarized Xenon

Download
  1. Get@NRC: Nucleation and Growth of Hydrates on Ice Surfaces: New Insights from 129Xe NMR Experiments with Hyperpolarized Xenon (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/jp012419x
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe Journal Of Physical Chemistry B: Condensed Phase
ISSN15206106
Volume105
Issue49
Pages1233812347; # of pages: 10
AbstractThe nucleation and growth of hydrate on the surface of ice was followed by NMR spectroscopy using hyperpolarized Xe. From the ice surface area and Xe pressure drop, the thickness of the hydrate film formed was ~ 500-1000 ? before the reaction became extremely slow. The cage occupancy ratio L/S was measured as a function of time from the Xe spectrum and was used to monitor the nature of the material formed. The ratio changed from values close to 1 during the early part of the reaction (induction time) to its equilibrium value of ~3-4 after nucleation processes were finished and rapid growth commenced. The low value can be seen as evidence of a precursor phase that is quite different from the equilibrium hydrate. The induction time was found to be a reproducible function of temperature and pressure for the conditions studied. The kinetics of gas uptake was analyzed according to the Avrami-Erofeyev equation used to describe solid-gas reactions. A surface memory effect was noted on successive cycles of xenon adsorption-desorption-readsorption, as the induction time was absent on the readsorption cycle. The new results are discussed in terms of models for nucleation and growth of hydrate and the various experiments that have been carried out in the past. It is essential to differentiate between later-stage diffusion-limited hydrate formation processes and the initial steps of hydrate formation at a surface, as they have opposite temperature coefficients.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
Identifier18077705
NPARC number12327771
Export citationExport as RIS
Report a correctionReport a correction
Record identifier62606486-9521-4ea9-84fb-7f60c0234600
Record created2009-09-10
Record modified2017-03-23
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)
Date modified: