POSSIBILITY OF SELECTIVE ADSORPTION OF MOLECULES ON A MODIFIED SURFACE

The possibility is considered of using a surface modified to have pits of certain shape and size to effect a selective adsorption of molecul es thereon. A theoretical analysis of the thermodynamics and the kinet ics of the selective adsorption of molecules on the modified surface i s performed. A ''surface modification efficacy parameter'', gamma, is suggested, equal to the ratio of the concentrations of molecules in th e pits and on the unmodified surface. The expressions for the paramete r gamma are derived with the help of both the thermodynamic and the ki netic approaches. The parameter gamma is estimated with the help of co mputer simulation by considering as an example the adsorption of argon atoms and acetylene and benzene molecules in the pits of the graphite surface.