Recently, MD simulations have shown that during gaseous diffusion of CO 2 in cylindrical carbon nanopores, certain distinct CO 2 density layers can develop inside the nanopore . These regions of higher density CO 2 appear as concentric circumferential layers within the pore. The first layer appears beyond an initial exclusion zone of sorts at the pore wall. The MD simulations of Mantzalis et al. indicate that at a gas pressure of 20 bar, and temperature of 300 K, anywhere from one to three concentric high density CO 2 layers form depending upon the radius of the nanopore. They considered carbon nanopores of chiral indices , , and . For additional information on how the chiral indices, (n, m), are determined, the reader is referred to the review paper by Qin .