The mixing behaviour of binary mixtures of carboxylic acid monolayers adsorbed on graphite interpreted using a regular solution model

Bickerstaffe, A. and Clarke, S. M. (2007) The mixing behaviour of binary mixtures of carboxylic acid monolayers adsorbed on graphite interpreted using a regular solution model. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 298 (1-2). pp. 80-82. ISSN 0927-7757

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Abstract

Mixing behaviour in monolayers of carboxylic acids physisorbed onto graphite is analysed using a regular solution model. Generally, experiments indicate that binary mixtures of acids with shorter alkyl chain lengths show extensive phase separation, while mixtures of longer and more similar acids mix non-ideally. Here the similarity of crystal structures is expressed quantitatively in terms of an isomorphism model and the degree of mixing by a regular solution interaction parameter. It is found that acids with more similar monolayer structures have a lower excess enthalpy of mixing. In addition, the extent of preferential adsorption is also investigated and it is found that the longer homologue is generally preferentially adsorbed but to a much lower extent than the corresponding alkane mixtures.

Item Type: Article
Uncontrolled Keywords: 2007 BPI IA49
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume: 298
Page Range: pp. 80-82
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:01
Last Modified: 23 Jul 2013 10:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/146

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