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Universal adsorption at the vapor-liquid interface near the consolute pointThe ellipticity of the vapor-liquid interface above mixtures of methylcyclohexane (C7H14) and perfluoromethylcyclohexane (C7F14) has been measured near the consolute point T(c) = 318.6 K. The data are consistent with a model of the interface that combines a short-ranged density-vs height profile in the vapor phase with a much longer-ranged composition-versus-height profile in the liquid. The value of the free parameter produced by fitting the model to the data is consistent with results from two other simple mixtures and a mixture of a polymer and solvent. This experiment combines precision ellipsometry of the vapor-liquid interface with in situ measurements of refractive indices of the liquid phases, and it precisely locates the consolute point.
Document ID
19900039300
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schmidt, James W.
(NIST, Thermophysics Div., Gaithersburg MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 15, 1990
Publication Information
Publication: Physical Review A - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 3rd Series
Volume: 41
ISSN: 0556-2791
Subject Category
Inorganic And Physical Chemistry
Accession Number
90A26355
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-16170
Distribution Limits
Public
Copyright
Other

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