Adsorption of krypton at 77 K on fullerene C60, graphitized carbon black and diamond Original Research ArticleAdsorption of krypton at 77 K on fullerene C60, graphitized carbon black and diamond Original Research Article

Adsorption of krypton at 77 K on fullerene C60, graphitized carbon black and nanocrystalline synthetic diamond has been investigated. The shape of the isotherm on nanocrystalline synthetic diamond indicates that the adsorption mechanism follows predominantly monolayer–multilayer adsorption. The isotherm on graphitized carbon black is characterized by a step-like form, at the lowest surface coverage the amount adsorbed obeying Henryʹs equation. The isotherm on fullerene is similar to that on graphitized carbon black in the low-pressure region. At relative pressures lower than 0.005, both isotherms have a sigmoidal shape, the only difference being that the cooperative build-up of the first layer ends at a lower coverage on fullerene. The comparison of isotherms on fullerene and graphitized carbon black has shown that krypton is adsorbed on both solids by the same mechanism at a surface coverage below 0.3.