Vapor Absorption and Adsorption

Because any surface deposition process begins with adsorption, we begin our discussion there. Molecules adsorb on the surface of a solid for a variety of 

The Langmuir isotherm, regarded as the starting point for any discussion of isotherms because of its simplicity and applicability, was derived by Irving Langmuir in 1918. Langmuir made four assumptions  

The adsorbed molecules do not interact with each other. 

The energy released when a molecule binds to the surface is independent of how much of the surface is covered with adsorbed molecules. 

A fixed number of sites are available for molecular adsorption. 

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