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Published April 1993 | public
Journal Article

The Melting of Unsaturated Capillary Condensate

Abstract

In many adsorbed systems, heat capacity peaks have been observed to occur near the triple-point temperature of the bulk adsorbate. These peaks are now understood to be due to the melting of unsaturated capillary condensate. In this paper we study that phase transition, presenting new data for these peaks in CH4, Ar, and Kr adsorbed in graphite foam, and analyzing those data in terms of competing models of melting of capillary condensate. We conclude that capillary condensate melts along a curve in the temperature-chemical potential plane that may be predicted from the properties of the bulk adsorbate, independent of the nature of the substrate.

Additional Information

© 1993 American Chemical Society. Received October 16, 1992. In Final Form: January 8, 1992. We acknowledge useful discussions with W. Saam, M. Den Nijs, M. Pettersen, and D. O. Edwards. This work was supported by DOE Grant DEFG03-85ER45192.

Additional details

Created:
August 20, 2023
Modified:
October 25, 2023