Adsorption of Ar on planar surfaces studied with a density functional theory.
The adsorption of Ar on planar structureless substrates of alkali metals, alkaline-earth metal Mg, CO2 , and Au was analyzed by applying a density functional formalism which includes a recently proposed effective attractive pair potential conditioned to Ar. It is shown that this approach reproduces the experimental surface tension of the liquid-vapor interface over the entire bulk coexistence curve for temperatures T spanning from the triple point Tt up to the critical point Tc. The wetting properties were studied over the entire range temperatures Tt<-->Tc. It was found that Ar wets all the investigated surfaces. The adsorption isotherms for alkali metals exhibit first-order phase transitions. Prewetting lines were resolved even for the less attractive surfaces. In the cases of Mg, CO2 , and Au a continuous growth for T> or =Tt was obtained. A comparison with experimental data and other microscopic calculations is reported.
Sartarelli
Salvador A
SA
Instituto de Desarrollo Humano, Universidad Nacional de General Sarmiento, Gutierrez 1150, RA-1663 San Miguel, Argentina.
Szybisz
Leszek
L
D000327:Adsorption; D001128:Argon / Q000737:chemistry*; D003198:Computer Simulation; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D013499:Surface Properties
D008670:Metals; D001128:Argon