Mixing in Adsorbed Monolayers: Perfluorinated Alkanes

Parker, J. E. and Clarke, S. M. (2008) Mixing in Adsorbed Monolayers: Perfluorinated Alkanes. Langmuir, 24 (9). pp. 4833-4844. DOI 10.1021/la703995u

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Official URL: http://dx.doi.org/10.1021/la703995u

Abstract

The mixing behavior of binary combinations of perfluoroalkanes in the bulk and in solid monolayers adsorbed at the graphite/liquid interface, determined by calorimetry and powder diffraction, is reported. The perfluoroalkanes are found to generally have a smaller excess enthalpy of mixing on the surface than in the bulk, and their relative size ratio is a good parameter to predict the mixing behavior. The excess enthalpy of mixing for perfluoroalkanes is found to be significantly smaller than that of the closely related hydrocarbons. The preferential adsorption of longer homologues over shorter ones is observed. Interestingly, the extent of preferential adsorption with relative size ratio is very similar to that of the hydrocarbons. These results can be understood in terms of the increased compressibility and lower polarizability of the perfluoroalkanes compared to hydrocarbons.

Item Type: Article
Uncontrolled Keywords: BPI
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Langmuir
Volume: 24
Page Range: pp. 4833-4844
Identification Number: 10.1021/la703995u
Depositing User: Sarah Humbert
Date Deposited: 22 Jul 2010 16:55
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1505

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