Phases of neon, xenon, and methane adsorbed on nanotube bundles

Calbi, M. Mercedes; Gatica, Silvina M.; Bojan, Mary J.; Cole, Milton W.

doi:10.1063/1.1414376

Cited by 83 publications

(94 citation statements)

References 17 publications

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“…In recent years much experimental effort has been devoted to the study of structural and thermal properties of such systems and a number of theoretical models have been advanced to predict these properties [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. However, the thermal expansion behavior of SWNT-gas impurity systems still remains obscure.…”

Section: Introductionmentioning

confidence: 99%

Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

Долбин

Esel'son

Gavrilko

et al. 2009

Low Temperature Physics

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The radial thermal expansion coefficient α r of pure and Xe-saturated bundles of singlewalled carbon nanotubes has been measured in the interval 2.2-120 K. The coefficient is positive above T = 5.5 K and negative at lower temperatures. The experiment was made using a low temperature capacitance dilatometer with a sensitivity of 2·10 -9 cm and the sample was prepared by compacting a CNT powder such that the pressure applied oriented the nanotube axes perpendicular to the axis of the cylindrical sample. The data show that individual nanotubes have a negative thermal expansion while the solid compacted material has a positive expansion coefficient due to expansion of the intertube volume in the bundles. Doping the nanotubes with Xe caused a sharp increase in the magnitude of α r in the whole range of temperatures used, and a peak in the dependence α r (T) in the interval 50-65 K. A subsequent decrease in the Xe concentration lowered the peak considerably but had little effect on the thermal expansion coefficient of the sample outside the region of the peak. The features revealed have been explained qualitatively.

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Section: Introductionmentioning

confidence: 99%

Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

Долбин

Esel'son

Gavrilko

et al. 2009

Low Temperature Physics

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“…Gas adsorption on SWNTs can also find use as gas storage material, as 'containers' for chemical reactions, or as catalyst substrate. The adsorption of Xenon, which serves as model system for the interaction of inert gases with SWNT bundles, has recently been studied experimentally and theoretically by a number of groups [3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Ulbricht

Kriebel

Moos

et al. 2002

Chemical Physics Letters

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We present a study on the kinetics of xenon desorption from single-wall carbon nanotube (SWNT) bundles using thermal desorption spectroscopy (TDS). TD-spectra from SWNT samples show a broad desorption feature peaked at significantly higher temperature than the corresponding low-coverage desorption feature on graphite. The observations are explained using a coupled desorption-diffusion (CDD) model, which allows the determination of the low-coverage Xe binding energy for adsorption on SWNT bundles, 27 kJ/mol. This energy is about 25% higher than the monolayer binding energy on graphite, 21.9 kJ/mol. By comparison with molecular mechanics calculations we find that this increase of the binding energy is consistent with adsorption in highly coordinated groove-sites on the external bundle surface.* Corresponding

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“…at the external surface of a bundle). Adsorption in this region has been much studied in theory and experiments [49]. We have therefore investigated the consequence of heterogeneity for that problem, with interesting results.…”

Section: Summary and Discussionmentioning

confidence: 99%

Bose-Einstein condensation of helium and hydrogen inside bundles of carbon nanotubes

et al. 2004

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Helium atoms or hydrogen molecules are believed to be strongly bound within the interstitial channels (between three carbon nanotubes) within a bundle of many nanotubes. The effects on adsorption of a nonuniform distribution of tubes are evaluated. The energy of a single particle state is the sum of a discrete transverse energy E t (that depends on the radii of neighboring tubes) and a quasicontinuous energy E z of relatively free motion parallel to the axis of the tubes. At low temperature, the particles occupy the lowest energy states, the focus of this study. The transverse energy attains a global minimum value (E t = E min ) for radii near R min = 9.95Å for H 2 and 8.48A for 4 He. The density of states N (E) near the lowest energy is found to vary linearly above this threshold value, i.e. N (E) is proportional to (E − E min ). As a result, there occurs a Bose-Einstein condensation of the molecules into the channel with the lowest transverse energy. The transition is characterized approximately as that of a four dimensional gas, neglecting the interactions between the adsorbed particles. The phenomenon is observable, in principle, from a singular heat capacity.The existence of this transition depends on the sample having a relatively broad distribution of radii values that include some near R min .

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Phases of neon, xenon, and methane adsorbed on nanotube bundles

Cited by 83 publications

References 17 publications

Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

Radial thermal expansion of pure and Xe-saturated bundles of single-walled carbon nanotubes at low temperatures

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

Bose-Einstein condensation of helium and hydrogen inside bundles of carbon nanotubes

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