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NMR study of thick films of methane on graphite

Pettersen, M. S. and Goodstein, D. L. (1989) NMR study of thick films of methane on graphite. Surface Science, 209 (3). pp. 455-464. ISSN 0039-6028. doi:10.1016/0039-6028(89)90088-5.

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We report the results of an NMR survey of the system methane adsorbed on graphite near the triple point temperature, in the thick-film regime (10–50 layers) where the methane behavior is substantially bulk-like. We study the interaction of the film with the substrate and find that T_1 is affected by a dipolar coupling with paramagnetic spin centers in the substrate. Since the systematics of these effects are now understood, they can be used as diagnostics in their own right. We are able to conclude that solid methane wets the graphite basal plane substrate to a thickness of at least 50 layers in the temperature range 70 K < T < 105 K. On the Grafoil substrate we employ, such thick films ought to be unstable with respect to capillary condensation, but capillary condensation is evidently not nucleated in our experiments.

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Additional Information:© 1989 Elsevier. Received 22 June 1988, Accepted 17 October 1988. The authors would like to thank Mark Lysek, Michael Cross and Bob Housley for helpful discussions during the progress of this work. This work was supported by DOE contract no. DE-FG03-85ER45192.
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Department of Energy (DOE)DE-FG03-85ER45192
Issue or Number:3
Record Number:CaltechAUTHORS:20151214-145755443
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Official Citation:M.S. Pettersen, D.L. Goodstein, NMR study of thick films of methane on graphite, Surface Science, Volume 209, Issue 3, 1 March 1989, Pages 455-464, ISSN 0039-6028, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62901
Deposited By: Ruth Sustaita
Deposited On:14 Dec 2015 23:33
Last Modified:10 Nov 2021 23:08

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