Argon adsorption in open-ended single-wall carbon nanotubes
- Groupe de Dynamique des Phases Condensees, Universite Montpellier II, F-34095 Montpellier Cedex 05 (France)
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9 (France)
- Institut fuer Experimentalphysik, Johannes Kepler Universitaet Linz, A-4040 Linz (Austria)
- CRMCN-CNRS, Faculte de Luminy, Case 901, F-13288 Marseille Cedex 9 (France)
- Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)
Thermodynamic and neutron-diffraction measurements combined with molecular dynamics simulation are used to determine the adsorption energies and the structure of argon condensed in the various adsorption sites of purified open-ended single-wall nanotube bundles. On the basis of these experiments and the simulation results, a consistent adsorption scenario has been derived. The adsorption proceeds first by the population of the walls inside the open nanotubes and the formation of one-dimensional Ar chains in the grooves at the outer surface of the bundles, followed by the filling of the remaining axial sites inside the nanotubes and the completion of a quasihexagonal monolayer on the outer surface of the bundle. The measurements also provide an estimate of the relative abundance of the various adsorption sites revealing that a major part of the adsorbed Ar is stored inside the open-ended nanotubes. Nanotube bundles generally show a certain degree of heterogeneity and some interstitial sites should be populated over a range of Ar chemical potential. However, for the sample used here, diffraction data and simulations suggest that heterogeneity is not a key feature of the bundles and there is little direct evidence of interstitial sites being populated.
- OSTI ID:
- 20666326
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 15; Other Information: DOI: 10.1103/PhysRevB.71.155411; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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