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dc.contributor.authorTaub, Haskelleng
dc.contributor.authorHansen, Flemming Y.eng
dc.contributor.authorCriswell, Leah, 1971-eng
dc.contributor.authorFuhrmann, D.eng
dc.contributor.authorHerwig, K. W.eng
dc.contributor.authorDiama, Armand, 1965-eng
dc.contributor.authorMo, Haiding, 1969-eng
dc.contributor.authorDimeo, R. M.eng
dc.contributor.authorNeumann, Dan A.eng
dc.contributor.authorVolkmann, Ulrich G.eng
dc.date.issued2004eng
dc.descriptionhttp://link.aip.org/link/?APCPCS/708/201/1eng
dc.description.abstractMonolayers of intermediate-length alkane molecules such as tetracosane (n-C24H50 or C24) serve as prototypes for studying the interfacial dynamics of more complex polymers, including bilayer lipid membranes. Using high-resolution quasielastic neutron scattering (QNS) and exfoliated graphite substrates, we have investigated the relatively slow diffusive motion in C24 monolayers on an energy/time scale of ~1-36 µeV (~0.1-4 ns). Upon heating, we first observe QNS in the crystalline phase at ~160 K. From the crystalline-to-smectic phase transition at ~215 K to a temperature of ~230 K, we observe the QNS energy width to be dispersionless, consistent with molecular dynamics simulations showing rotational motion of the molecules about their long axis. At 260 K, the QNS energy width begins to increase with wave vector transfer, suggesting onset of nonuniaxial rotational motion and bounded translational motion. We continue to observe QNS up to the monolayer melting temperature at ~340 K where our simulations indicate that the only motion slow enough to be visible within our energy window results from the creation of gauche defects in the moleculeseng
dc.description.sponsorshipThis work was supported by the National Science Foundation (NSF) under Grant Nos. DMR-9802476 and DMR-0109057, by the Chilean government under FONDECYT Grant No. 1010548, and by the U. S. Department of Energy through grant DE-FG02-01ER45912. The neutron scattering facilities used in this work are supported in part by the NSF under Agreement No. DMR-0086210.eng
dc.identifier.citationAIP Conf. Proc. -- April 30, 2004 -- Volume 708, pp. 201-204eng
dc.identifier.issn0094-243Xeng
dc.identifier.urihttp://hdl.handle.net/10355/8761eng
dc.languageEnglisheng
dc.publisherAmerican Institute of Physicseng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.subject.lcshBilayer lipid membraneseng
dc.subject.lcshPolymerseng
dc.subject.lcshMonomolecular filmseng
dc.subject.lcshDiffusioneng
dc.subject.lcshGraphiteeng
dc.subject.lcshAdsorptioneng
dc.subject.lcshMolecular dynamicseng
dc.titleSlow Diffusive Motions in a Monolayer of Tetracosane Molecules Adsorbed on Graphiteeng
dc.typeArticleeng


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