| Issue |
Europhys. Lett.
Volume 63, Number 2, July 2003
|
|
|---|---|---|
| Page(s) | 254 - 260 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00512-5 | |
| Published online | 01 November 2003 | |
Isotope velocity differentiation in thin carbon nanotubes through quantum diffusion
1
Kirenski Institute of Physics of the Siberian Branch
of the Russian Academy of
Science - Krasnoyarsk, 660036, Russia
2
Institut für Materialphysik of the Universität Wien - Wien, Austria
Corresponding author: alex99@akadem.ru
Received:
3
December
2002
Accepted:
12
May
2003
An approach is proposed to evaluate the average velocities of adsorbate molecules in one-dimensional nanopore, when quantum tunneling between neighboring potential minima leads to nonzero velocity. The approach is used to calculate the hydrogen isotope molecule (H2, D2, T2) velocities in ultrathin carbon single-wall nanotubes (SWNT) (3,3) and (6,0). It is shown that the isotope mass difference leads to large differences of the quantum tunneling value and large differences of the average molecule velocities, especially inside the tube (6,0). It is shown that different tube chirality leads to drastically different velocities of adsorbate molecules, even if the diameters of both nanotubes do not differ significantly.
PACS: 66.35.+a – Quantum tunneling of defects / 68.43.Jk – Diffusion of adsorbates, kinetics of coarsening and aggregation / 68.43.Mn – Adsorption/desorption kinetics
© EDP Sciences, 2003
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