Where are the molecules adsorbed on single-walled nanotubes?

Volumetric measurements of Xe, CF4 and SF6 adsorption isotherms on single-walled carbon nanotubes grouped in bundles are reported. Adsorption in the grooves on the outer bundle surface, on the remaining part of the external surface, in the interstitial channels as well as on amorphous carbon impurities is discussed in the light of a comparison of these results with those recorded previously for methane on the same substrate.