Rare gas–graphite interaction potentials

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Abstract
The interaction of neon, argon, krypton, and xenon with the graphitized carbon black P33 (2700) is examined using the virial coefficient treatment of physical adsorption. Adsorption isotherm data in the low coverage, Henry’s law region are used to carry out this analysis. A modified Buckingham potential is selected to model the gas–solid interaction potential. A best fitting technique is used to make an unambiguous selection of the interaction potential parameters. A cubic power law decay is found to be the proper choice for the attractive portion of the potential, while the appropriate screening parameters for the exponential, repulsive portion of the potential are determined to be 0.0181, 0.0196, 0.0198, and 0.0215 (nm) for Ne, Ar, Kr, and Xe, respectively. The adatom–adsorbent internuclear separations are 0.307, 0.333, 0.336, and 0.366 (nm) and the gas–solid interaction energies are 384, 1113, 1467, and 1928 (°K) for Ne, Ar, Kr, and Xe, respectively. A surface area of 10.8±0.3 m2g−1 is obtained for the graphitized carbon black.