Isosteric heat of adsorption of CO$_{2}$ in bundles of carbon nanotubes.

Using the grand canonical Monte Carlo method, we have evaluated the adsorption isotherms of CO$_{2}$ on the exterior of a bundle of carbon nanotubes. The isosteric heat is a property of the adsorbate that can be calculated from experimental or simulation data, and gives hints of the energy of adsorption and the structure of the adsorbate. From the simulated adsorption isotherms we calculated the isosteric heat of CO$_{2}$, Ar and CH$_{4}$ and compare with existing experimental data. Research supported by NSF and ACS, PRF.