Evidence of 1D behaviour of He${}^4$ confined within carbon-nanotube bundles

Abstract

We present the first low-temperature thermodynamic investigation of the controlled physisorption of He${}^4$ gas in carbon single-wall nanotube (SWNT) samples. The vibrational specific heat measured between 100 mK and 6 K demonstrates an extreme sensitivity to outgassing conditions. For bundles with a few number of NTs the extra contribution to the specific heat, C${}_{ads}$, originating from adsorbed He${}^4$ at very low density displays 1D behavior, typical for He atoms localized within linear channels as grooves and interstitials, for the first time evidenced. For larger bundles, C${}_{ads}$ recovers the 2D behaviour akin to the case of He${}^4$ films on planar substrates (grafoil).

4 pages, 3 figures, submitted to Phys. Rev. Lett

References in corpus (4)

• Quantized phonon specrum of single-wall carbon nanotubes
• Uptake of gases in bundles of carbon nanotubes
• Anisotropic Condensation of Helium in Nanotube Bundles
• Adsorption of He atoms in external grooves of single wall carbon nanotube bundles

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• Quantum Fluids in Nanotubes: a Quantum Monte Carlo Approach
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