Abstract
We present a theoretical exploration of the adsorption of rare gases in carbon nanotubes. In both the classical and the quantum cases, nanotube adsorption provides a nearly ideal realization of quasi-one-dimensional (1D) matter. We have studied the adsorption potentials, the gas-surface virial coefficient and the isosteric heat of adsorption. Comparison shows a much stronger binding of the adsorbate in the tubes than at the planar surface of graphite. As a consequence, one can easily adsorb sufficiently many atoms to be measurable in a thermodynamic or scattering experiment. In studying the low coverage adsorption we find great sensitivity to the species, the assumed potential model, and the radius of the tubes. The effect of interactions between the adsorbed particles is evaluated in the 1D classical case.
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