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Theory and Observation of Displacement Phenomena in Coadsorbed Films

Weber, William J. and Goodstein, David L. (1999) Theory and Observation of Displacement Phenomena in Coadsorbed Films. Physical Review Letters, 83 (19). pp. 3888-3891. ISSN 0031-9007. doi:10.1103/PhysRevLett.83.3888.

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Displacement refers to a surprising phenomenon observed in a number of adsorption systems. At low temperatures, some relatively inert gases, such as krypton (Kr) or methane ( CH4), are found to displace molecules from preadsorbed monolayer films of a more condensable species, such as carbon tetrachloride ( CCl4), from a graphite substrate. We present a simple thermodynamic model to explain displacement and make a prediction applicable to both first-order and continuous displacement processes. We also present measurements on CH4/CCl4 and Kr/CCl4 coadsorbed films from 77–112 K that verify our prediction and yield the CCl4 film spreading pressure.

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Additional Information:©1999 The American Physical Society Received 3 May 1999
Issue or Number:19
Record Number:CaltechAUTHORS:WEBprl99
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6573
Deposited By: Archive Administrator
Deposited On:13 Dec 2006
Last Modified:08 Nov 2021 20:35

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