Abstract
Spin exchange optical pumping enhanced 129Xe NMR is applied to the study of SF6/Xe and acetone/Xe mixed type-II clathrate hydrate formation at 223 K. The highly polarized (i.e., hyperpolarized) 129Xe gas was reacted with the type-II structure that had been preformed by reaction of SF6 or acetone-d6 with solid ice at 205 K. At 223 K, enclathration into the preformed type-II structure was observed to occur on the time-scale of several minutes. The spectra show that Xe is excluded from the larger hexakaidecahedral cavities, and that the degree of exclusion appears to be more complete in the case of acetone-d6. A comparison of the 129Xe NMR line shapes in the acetone-d6/Xe and SF6/Xe mixed clathrate hydrates at 223 K reveals a reduction of symmetry of the dodecahedral cavities in the latter, apparently due to differences in the water reorientation dynamics.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
