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Melting of thin films of alkanes on magnesium oxide

DOI: 10.1140/epjst/e2009-00950-7 DOI Help

Authors: A. Barbour (University of Tennessee) , S. Chanaa (University of Tennessee) , R. E. Cook (University of Tennessee) , D. Fernandez-canato (University of Tennessee) , P. Landry (University of Tennessee) , T. Seydel (Institut Laue-Langevin) , P. Yaron (University of Tennessee) , J. Z. Larese (University of Tennessee) , Tom Arnold (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: European Physical Journal Special Topics , VOL 167 (1) , PAGES 1951-6355

State: Published (Approved)
Published: March 2009

Abstract: Recent incoherent neutron scattering investigations of the dynamics of thin alkane films adsorbed on the Magnesium Oxide (100) surface are reported. There are marked differences in the behaviour of these films, as a function of temperature and coverage, compared to similar measurements on graphite. In particular, it has previously been shown that adsorbed multilayer films on graphite exhibit an interfacial solid monolayer that coexists with bulk-like liquid, well above the bulk melting point. In contrast, these studies show that the alkane films on MgO exhibit no such stabilization of the solid layer closest to the substrate as a function of the film thickness, even though the monolayer crystal structures are remarkably similar. These studies are supported by extensive thermodynamic data, a growing body of structural data from neutron diffraction and state of the art computer modelling

Journal Keywords: Multilayer Film; Magnesium Oxide; Graphite; Incoherent Neutron; Bulk Melting Point

Subject Areas: Physics

Instruments: NONE-No attached Diamond beamline