Abstract
This chapter presents the extension and modification of the theory of mobile monolayer adsorption on homogeneous surfaces to heterogeneous surfaces. The theoretical description of mobile monolayer adsorption on heterogeneous surfaces is more complicated than that of localized adsorption. In the case of mobile adsorption on surfaces with random topography, the adsorbed phase (film) is one thermodynamic entity and the concepts of gradually covered parts (points) of the surface can no longer be accepted. Therefore, it should be realized that neither the RJ approach nor its simplified condensation approximation (CA) version can be applied to mobile adsorption on heterogeneous surfaces, characterized by random surface topography. In the case of adsorption on heterogeneous solid surfaces, the surface heterogeneity will mean not only the dispersion of the values of the local minima in the gas–solid potential function. It is to be expected that these local minima will be separated by various energy barriers. At temperatures close to the neon boiling point, the state of the adsorbate is liquid-like rather than gas-like and attributed the anomaly to a “melting” process.
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