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Characterization of single wall carbon nanotubes by means of rare gas adsorption
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10.1063/1.2431364
/content/aip/journal/jcp/126/5/10.1063/1.2431364
http://aip.metastore.ingenta.com/content/aip/journal/jcp/126/5/10.1063/1.2431364

Figures

Image of FIG. 1.
FIG. 1.

Experimental isotherms on closed- and opened-tube bundles. (a) Kr at . (b) Xe at (Ref. 17).

Image of FIG. 2.
FIG. 2.

Schematic representation of the cross section of an ideal hexagonal bundle made of (10, 10) SWNTs with tubes on each edge. The adsorption sites (G, T, I, E) are also reported.

Image of FIG. 3.
FIG. 3.

Dependence of the binding energy as a function of the tube radius for Kr (a) and Xe (b).

Image of FIG. 4.
FIG. 4.

The calculated arrangement of (a) Kr and (b) Xe in different sites of (10, 10) tube based on energy minimization. Lateral interaction, though small, is also included in these calculations in order to optimize the arrangement of the adsorbates.

Image of FIG. 5.
FIG. 5.

Calculated isotherms on a closed (10, 10) tube bundle with . (a) Kr at . (b) Xe at . The letters above the plateaus indicate the sites responsible for adsorption. The axis represents the number of adsorbed atoms per unit length. The theoretical curves stop at the experimental saturation pressure for the two gases; our simple model near cannot reproduce the experimental behavior of the adsorbate.

Image of FIG. 6.
FIG. 6.

Set of typical isotherms calculated (a) between 45 and for Kr and (b) between 80 and for Xe. The axis represents the number of adsorbed atoms per unit length.

Image of FIG. 7.
FIG. 7.

dependence vs the reciprocal temperature (a) between 77 and for Kr and (b) between 110 and for Xe.

Image of FIG. 8.
FIG. 8.

Calculated isotherms for (a) Kr at and (b) Xe at on a closed-tube bundle formed by tubes with . The radii corresponding to the curves in (b) are the same as those indicated in (a). The axis represents the number of adsorbed atoms per unit length.

Image of FIG. 9.
FIG. 9.

Calculated isotherms on open (upper) and closed (lower) tube bundles for (a) Kr at and (b) Xe at . The axis represents the number of adsorbed atoms per unit length.

Image of FIG. 10.
FIG. 10.

Influence of the lateral interactions on the adsorption isotherms for (a) Kr at and (b) Xe at . The axis represents the number of adsorbed atoms per unit length.

Tables

Generic image for table
Table I.

Adsorption energies of Kr and Xe in all possible sites (I, G, T, E) using three opened single wall (10,10) CNTs arranged in a perfect triangular lattice

Generic image for table
Table II.

The total number of adatoms per type of site according to , the number of C atoms per edge of a hexagonal bundle (see Fig. 2).

Generic image for table
Table III.

The isosteric heat of adsorption (expressed in meV) calculated for Kr between 77 and and Xe between 110 and in each site for different tube radii.

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/content/aip/journal/jcp/126/5/10.1063/1.2431364
2007-02-07
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterization of single wall carbon nanotubes by means of rare gas adsorption
http://aip.metastore.ingenta.com/content/aip/journal/jcp/126/5/10.1063/1.2431364
10.1063/1.2431364
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