Adsorption and Diffusion of Molecular Nitrogen in Single Wall Carbon Nanotubes

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Abstract
Using molecular simulation, the adsorption and self-diffusion of diatomic nitrogen molecules inside a single wall carbon nanotube have been studied over a range of nanotube diameters (8.61−15.66 Å) and loadings at temperatures of 100 and 298 K. Nitrogen adsorption energy is found to increase as the nanotube diameter is reduced toward the molecular diameter of nitrogen. A discrete organization of the nitrogen into adsorbed layers is observed at high loadings that follows a regular progression determined primarily by geometric considerations. The formation of an adsorbate core at the center of the nanotube is found to increase the self-diffusion of nitrogen. A “wormlike” phase is found for the adsorbed nitrogen in the (15, 0) carbon nanotube at high loadings and at 100 K.
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