ENERGETIC CLASSIFICATION OF ADSORPTION-ISOTHERMS

The new model describes adsorption isotherms with a two-parameter func tion, The parameters are easy and precise to calculate from the excess surface work of the adsorbed layer, The excess surface work is define d as the product of adsorbed amount and the change of the chemical pot ential, The differential form yields a minimum at the first layer. It is possible to linearize the corresponding integral form, The physical meanings of the two parameters are the monolayer capacity and the che mical potential, which is necessary for adsorption, The new model allo ws an energetic classification of adsorption phenomena of surface film s in the energetic range from weak physisorption to chemical adsorptio n. (C) 1996 Academic Press, Inc.