(192e) Transport of CO2 and N2 through Single-Walled Carbon Nanotube Membranes
AIChE Annual Meeting
Tuesday, November 1, 2005 - 9:12am to 9:30am
Recent theoretical studies and experimental studies have given indications that carbon nanotubes might be a membrane material with attractive properties quite different to polymeric membranes. We have used atomically detailed simulations to examine the adsorption and transport diffusion of CO2 and N2 in single walled carbon nanotubes at room temperature as a function of nanotube diameter. Linear and spherical models for CO2 are compared, showing that representing this species as spherical has only a slight impact in the computed diffusion coefficients. Our results support previous predictions that transport diffusivities of molecules inside carbon nanotubes are extremely rapid when compared with other porous materials. By examining carbon nanotubes as large as the (40,40) nanotube, we are able to compare the transport rates predicted by our calculations with recent experimental measurements. The predicted transport rates are in reasonable agreement with experimental observations.