Skoulidas et al. performed MD simulations with gaseous CO 2 within a carbon nanopore of indices (40,40) at 298 K and pressures from 1.0 bar to 212.7 bar. They found that at 1.0 bar a lone outer layer appeared, near the pore wall, with the bulk of the gas existing within this layer. With increasing pressures, the CO 2 molecules begin to spill out of the outer layer and eventually the entire center of the pore becomes saturated with the gas and the layering structure becoming less pronounced though the outer and an inner secondary high density band still show slightly higher gas densities than other regions in the nanopore. Though this layering phenomenon in carbon nanopores has been reported for other gases, such as O 2 , Ar, H 2 , N 2 and Br 2 , we focus here on the results for CO 2 and more specifically those reported by Skoulidas et al. .