caa a22 4500 46317027X CHVBK 20180406164811.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10450-007-9048-y doi (NATIONALLICENCE)springer-10.1007/s10450-007-9048-y The options of interference microscopy to explore the significance of intracrystalline diffusion and surface permeation for overall mass transfer on nanoporous materials [Elektronische Daten] [L. Heinke, P. Kortunov, D. Tzoulaki, J. Kärger] After a short introduction into interference microscopy and its potentials in monitoring transient concentration profiles in nanoporous materials, we concentrate on the special options of an analysis of these profiles close to the crystal surfaces. We shall in particular introduce a novel route of correlating the overall uptake, at a certain instant of time, with the current boundary concentration. In this way, the significance of surface resistances to overall molecular uptake may be most vividly demonstrated. Considering a large variety of nanoporous host-guest systems, including methanol in zeolites ferrierite, methanol in MOF Manganese(II)-formate and methanol in SAPO STA-7, quite different patterns of surface resistivities may be observed. Ageneralized analysis is complicated by the fact that both the diffusivities and the surface permeabilities are found to notably depend on the actual concentration. As a consequence, for one and the same system and over identical pressure steps, the relative contributions of diffusion and surface permeation to the overall process may be quite different for desorption and adsorption. Springer Science+Business Media, LLC, 2007 Diffusion nationallicence Surface resistance nationallicence Interference microscopy nationallicence α : surface permeability (m s−1) nationallicence c : relative concentration (change) nationallicence c surf : relative concentration at the crystal edge nationallicence D : transport diffusivity (m2 s−1) nationallicence l : half channel length (m) nationallicence L : parameter α⋅l/D nationallicence m : relative uptake by the crystal nationallicence τ diff : time constant of mass transport only limited by diffusion(s) nationallicence τ surf : time constant of mass transport only limited by surface resistance(s) nationallicence τ surf+diff : time constant of mass transport limited by diffusion and surface resistance(s) nationallicence w : intercept of the asymptote of the c surf-m-correlation plot with the ordinate nationallicence x , y , z : space coordinates (m) nationallicence Heinke L. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Kortunov P. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Tzoulaki D. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Kärger J. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 215-223 0929-5607 13:3-4<215 2007 13 10450 https://doi.org/10.1007/s10450-007-9048-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10450-007-9048-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Heinke L. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Kortunov P. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Tzoulaki D. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Kärger J. Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, 04103, Leipzig, Germany aut NATIONALLICENCE 773 0- Adsorption Springer US; http://www.springer-ny.com 13/3-4(2007-08-01), 215-223 0929-5607 13:3-4<215 2007 13 10450 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer