The growth of Helium-4 and molecular Hydrogen on closed-end, single-wall carbon nanotube bundles
Abstract
Carbon nanotube bundles used as substrates for physical adsorption offer possibilities for the growth and study of one-, two-, and three-dimensional matter (1d, 2d, 3d). For bundles composed of closed-end nanotubes, imperfect bundle interstitials, interstitials, external grooves, and external graphene bundle surfaces are places for growth of linear chains of atoms/molecules, followed by more complex structures. ^4He, H2 and Ar are substances (''quantum" and ''classical") that have been studied extensively in 3d and 2d. We present results on the growth of single layer films of ^4He and H2 on mostly single-wall, closed-end bundles obtained by extensive adsorption isotherm and AC heat capacity measurements; these results will be supported, where necessary, by our neutron diffraction results using D2 and ^36Ar, and by work of other research groups (Lasjousnias, Hallock, Migone). Adsorption appears to proceed in the order heterogeneous sites/external grooves, three-lines on external grooves, and external graphene surface before second layer growth. Uncertainties in this picture of growth, as compared to theoretical predictions, will be dicussed.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MAR.W1002V