DEVIATION FROM HENRYS LAW - EFFECTS OF ENERGETIC HETEROGENEITY AND OFSURFACE-DIFFUSION

This article focuses on the clustering effects of admolecules driven b y surface diffusion in a heterogeneous energy landscape as a mechanism for Freundlich behavior at low pressures. The idealized preferential adsorption model is presented and the phenomenology of this model is j ustified in terms of surface diffusion (preferential adsorption model, PAM). Mean field analysis and Monte Carlo simulation of PAM are analy zed. The effects of temperature and of patchwise distributions of adso rption energies are discussed.