The diffusion of tetrafluoromethane in single-walled aluminosilicate nanotubes was studied by means of pulsed field gradient nuclear magnetic resonance and molecular dynamics simulations. The application of a high magnetic field and high magnetic field gradients permitted 13C pulsed field gradient nuclear magnetic resonance measurements of diffusion to be performed under conditions of sufficiently large signal-to-noise ratios for a broad range of CF4 loadings. The pulsed field gradient nuclear magnetic resonance data were analyzed in order to obtain the diffusivities for the diffusion of CF4 inside the nanotube aggregates, where the sorbate displacements exceeded the average length of individual nanotubes. The corresponding diffusivities under conditions of fast exchange of CF4 molecules, between nanotubes or nanotube aggregates and the surrounding gas phase in a nanotube bed, were also estimated. The experimental CF4 diffusivities within the nanotube aggregates were several times smaller than the corresponding diffusivities obtained by molecular dynamics for diffusion within defect-free nanotubes. This difference suggested the existence of additional transport resistances, within the nanotube aggregates, under the conditions of the reported pulsed field gradient measurements. That is, when the gas molecules diffused through several nanotubes interconnected along the nanotube lengths inside the aggregates. Such additional transport resistances were likely to originate from diffusion through thin layers of microporous material that were expected to connect the individual nanotubes in the aggregates.Diffusion of Tetrafluoromethane in Single-Walled Aluminosilicate Nanotubes: Pulsed Field Gradient NMR and Molecular Dynamics Simulations. Dvoyashkin, M., Zang, J., Yucelen, G.I., Katihar, A., Nair, S., Sholl, D.S., Bowers, C.R., Vasenkov, S.: Journal of Physical Chemistry C, 2012, 116[40], 21350-5