Ordering in a Fluid Inert Gas Confined by Flat Surfaces
Science, Vol. 296, Issue 5567, 507-510, April 19, 2002
http://www.sciencemag.org/cgi/content/full/296/5567/507
High-resolution transmission electron microscopy images of
room-temperature fluid xenon in small faceted cavities in
aluminum reveal the presence of three well-defined layers
within the fluid at each facet. Such interfacial layering
of simple liquids has been theoretically predicted, but
observational evidence has been ambiguous. Molecular dynamics s
imulations indicate that the density variation induced by
the layering will cause xenon, confined to an approximately
cubic cavity of volume 8 cubic nanometers, to condense into
the body-centered cubic phase, differing from the face-centered
cubic phase of both bulk solid xenon and solid xenon confined
in somewhat larger (20 cubic nanometer) tetradecahedral cavities
in face-centered cubic metals. Layering at the liquid-solid
interface plays an important role in determining physical
properties as diverse as the rheological behavior of
two-dimensionally confined liquids and the dynamics of crystal
growth.
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