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Experimental and Theoretical Studies of Wetting and Multilayer AdsorptionThe recent work with partially miscible binary liquid mixtures has established that the structure of the liquid-vapor interface can undergo a first-order phase transition from incomplete to complete wetting of the vapor as the temperature is raised. A discontinuity in the change of interfacial tension as a function of temperature at the phase transition has been predicted to occur in many systems and to play an important role in the growth of uniform composites from alloy melts at monotectic points. These measurements are the first to establish the order of the transition. Studies of capillary rise in SF6 in a unique interferometer have led to the first measurements of the thickness of wetting layers (or equivalently, multilayer adsorbed films) on a solid surface near a liquid-vapor critical point. Instabilities in wetting layers were observed. A theory for the instabilities is being developed and will be checked by both static and dynamic optical experiments. The effect of gravity on the apparent thickness of interfaces (as measured by ellipsometry) is under study.
Document ID
19860000654
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Moldover, M. R.
(National Bureau of Standards, Washington, DC, United States)
Schmidt, J. W.
(National Bureau of Standards, Washington, DC, United States)
Cahn, J. W.
(National Bureau of Standards, Washington, DC, United States)
Kayser, R. F.
(National Bureau of Standards, Washington, DC, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: NASA, Washington Microgravity Sci. and Appl. Program Tasks
Subject Category
Astronautics (General)
Accession Number
86N10121
Funding Number(s)
CONTRACT_GRANT: NASA ORDER H-27954-B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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