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Activity coefficients for adsorption of laterally interacting molecules on a random heterogeneous solid surface

  • James A. O'Brien
  • , Alan L. Myers

Research output: Chapter in Book/Report/Conference proceedingsConference proceedingpeer-review

Abstract

A simple lattice model of adsorbed mixtures is proposed and solved in the Bragg-Williams approximation, assuming random surface heterogeneity and nearest-neighbour lateral interactions. Activity coefficients and excess area of adsorption are calculated using the lattice model. These activity coefficients are defined relative to an adsorbed solution which mixes ideally at constant spreading pressure. Heterogeneity causes negative deviations whereas lateral interactions cause positive deviations from Raoult's law. Application of the model to 'liquid' adsorption yields an interpretation of some data which have previously not been explained.

Original languageEnglish
Title of host publicationProc of the Second Eng Found Conf on Fundamt of Adsorption
PublisherPubl by Engineering Foundation
Pages451-461
Number of pages11
ISBN (Print)0816903980
Publication statusPublished - 1987
Externally publishedYes
EventProceedings of the Second Engineering Foundation Conference on Fundamentals of Adsorption - Santa Barbara, CA, USA
Duration: 4 May 19869 May 1986

Publication series

NameProc of the Second Eng Found Conf on Fundamt of Adsorption

Conference

ConferenceProceedings of the Second Engineering Foundation Conference on Fundamentals of Adsorption
CitySanta Barbara, CA, USA
Period4/05/869/05/86

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