Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-02-16
Fiz. Nizk. Temp., 2011, v. 37, No. 6, p. 685-687
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3 pages, 1 figure, 16 references
Scientific paper
The radial thermal expansion {\alpha}r of bundles of single-walled carbon nanotubes saturated with 3He up to the molar concentration 9.4% has been investigated in the temperature interval 2.1-9.5 K by high-sensitivity capacitance dilatometry. In the interval 2.1-7 K a negative {\alpha}r was observed, with a magnitude which exceeded the largest negative {\alpha}r values of pure and 4He-saturated nanotubes by three and two orders of magnitude, respectively. The contributions of the two He isotope impurities to the negative thermal expansion of the nanotube bundles are most likely connected with the spatial redistribution of 4He and 3He atoms by tunneling at the surface and inside nanotube bundles. The isotope effect turned out to be huge, probably owing to the higher tunneling probability of 3He atoms.
Dolbin A. V.
Esel'son V. B.
Gavrilko V. G.
Manzhelii V. G.
Popov S. N.
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