Interstitial He and Ne in Nanotube Bundles
نویسندگان
چکیده
We explore the properties of atoms confined to the interstitial regions within a carbon nanotube bundle. We find that He and Ne atoms are of ideal size for physisorption interactions, so that their binding energies are much greater there than on planar surfaces of any known material. Hence high density phases exist at even small vapor pressure. There can result extraordinary anisotropic liquids or crystalline phases, depending on the magnitude of the corrugation within the interstitial channels. PACS numbers: 61.46.+w, 61.48.+c, 67.40, 67.70
منابع مشابه
Many–body interactions among adsorbed atoms and molecules within carbon nanotubes and in free space
Studies of three–dimensional and two–dimensional condensed phases have shown that many– body interactions contribute ∼ 10% to the equations of state of noble gases. This paper assesses the importance of three–body triple dipole interactions for quasi–one–dimensional phases of He, Ne, H2, Ar, Kr and Xe confined within interstitial channels or on the external surfaces of nanotube bundles. We find...
متن کاملCrossover from Single-File to Fickian Diffusion in Carbon Nanotubes and Nanotube Bundles: Pure Components and Mixtures
The diffusion mechanism of pure component Ar and binary mixtures of Ar/Kr and Ar/Ne confined in single-walled carbon nanotubes (SWNTs) and bundles was investigated by a combined Grand Canonical Monte Carlo and molecular dynamics study. For Ar confined in SWNTs, a crossover from single-file to Fickian diffusion existed when the density of Ar was a minimum as a function of the SWNT diameter. Argo...
متن کاملDynamics of one-dimensional and two-dimensional helium adsorbed on carbon nanotubes
We present inelastic neutron scattering measurements of the dynamics of helium adsorbed on carbon nanotube bundles. The goal is to determine the vibrational properties of the 1D and 2D quantum solids that are stabilized on the nanotube bundle surfaces at different fillings of He. The mean square vibrational amplitude in the 1D solid is large with a Lindemann ratio of γ1D = (〈u〉)/a1 = 0.25 compa...
متن کاملOne-dimensional and two-dimensional quantum systems on carbon nanotube bundles.
We report the first measurement of the structure of 4He atoms adsorbed on bundles of single-walled carbon nanotubes. Neutron diffraction techniques and nanotube samples closed at the end were used. At low coverage, 4He forms a 1D, single line lattice along the grooves between two nanotubes on the surface of the nanotube bundles. As coverage is increased, additional lines of 1D lattices form alo...
متن کاملAdsorption and separation of linear and branched alkanes on carbon nanotube bundles from configurational-bias Monte Carlo simulation
The adsorption and separation of linear C1-nC5 and branched C5 isomers alkanes on single-walled carbon nanotube bundles at 300 K have been studied using configurational-bias Monte Carlo simulation. For pure linear alkanes, the limiting adsorption properties at zero coverage exhibit a linear relation with the alkane carbon number; the long alkane is more adsorbed at low pressures, but the revers...
متن کامل