title: Guest diffusion in interpenetrating networks of micro- and mesopores.
abstract: Pulsed field gradient NMR is applied for monitoring the diffusion properties of guest molecules in hierarchical pore systems after pressure variation in the external atmosphere. Following previous studies with purely mesoporous solids, also in the material containing both micro- and mesopores (activated carbon MA2), the diffusivity of the guest molecules (cyclohexane) is found to be most decisively determined by the sample "history": at a given external pressure, diffusivities are always found to be larger if they are measured after pressure decrease (i.e., on the "desorption" branch) rather than after pressure increase (adsorption branch). Simple model consideration reproduces the order of magnitude of the measured diffusivities as well as the tendencies in their relation to each other and their concentration dependence.
authors.affiliation: Department of Environmental Engineering, UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
authors.forename: Filipe
authors.initials: F
authors.lastname: Furtado
authors.forename: Petrik
authors.initials: P
authors.lastname: Galvosas
authors.forename: Maraisa
authors.initials: M
authors.lastname: Gonçalves
authors.forename: Frank-Dieter
authors.initials: FD
authors.lastname: Kopinke
authors.forename: Sergej
authors.initials: S
authors.lastname: Naumov
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodríguez-Reinoso
authors.forename: Ulf
authors.initials: U
authors.lastname: Roland
authors.forename: Rustem
authors.initials: R
authors.lastname: Valiullin
authors.forename: Jörg
authors.initials: J
authors.lastname: Kärger