Abstract
The effects of dimensional incompatibility and of potential barriers for surface diffusion on the phase transitions in a monolayer are discussed in terms of the partially mobile adsorption layer model presented in a previous publication. It is pointed out that the formation of a two-dimensional solid phase in registry with the adsorbent can be either discontinuous (first order) or continuous depending on the properties of the adsorption system. In particular, the first-order transition from the liquid to the solid phase can occur only when the system exhibits small dimensional incompatibility. The changes in various thermodynamic functions for the monolayer ( e.g. the isosteric heat of adsorption, the differential entropy and the heat capacity) due to phase transitions are discussed.
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