Surface Area Measurements with Linear Adsorbates: An Experimental Comparison of Different Theoretical Approaches

The specific area of a substrate was determined from the results of adsorption isotherms performed with a sequence of four alkanes, from methane to butane, using three different approaches. The data were first analyzed using the BET equation and the point B methods; these results were compared with...

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Bibliographic Details
Published in:Langmuir 2009-08, Vol.25 (16), p.9227-9231
Main Authors: Rawat, D. S, Migone, A. D, Riccardo, J. L, Ramirez-Pastor, A. J, Romá, F. J
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
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Summary:The specific area of a substrate was determined from the results of adsorption isotherms performed with a sequence of four alkanes, from methane to butane, using three different approaches. The data were first analyzed using the BET equation and the point B methods; these results were compared with those obtained using a new equation designed for examining the case of multisite occupancy. The new model specifically accounts for sites that are left uncovered in the case of adsorption by linear adsorbates. Of these three, only the last method gives essentially the same value for the specific surface area of the substrate when different adsorbates are used to measure it. The other two, more traditional, approaches give values of the specific surface area that decrease as the length of the adsorbate used increases.
ISSN:0743-7463
1520-5827
DOI:10.1021/la9008009