Experimental isotherms on closed- and opened-tube bundles. (a) Kr at . (b) Xe at (Ref. 17).
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.
Dependence of the binding energy as a function of the tube radius for Kr (a) and Xe (b).
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.
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.
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.
dependence vs the reciprocal temperature (a) between 77 and for Kr and (b) between 110 and for Xe.
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.
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.
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.
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
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).
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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