Abstract
The intense interactions of guest molecules with the pore walls of nanoporous materials is the subject of continued fundamental research. Stimulated by their thermal energy, the guest molecules in these materials are subject to a continuous, irregular motion, referred to as diffusion. Diffusion, which is omnipresent in nature, influences the efficacy of nanoporous materials in reaction and separation processes. The recently introduced techniques of microimaging by interference and infrared microscopy provide us with a wealth of information on diffusion, hitherto inaccessible from commonly used techniques. Examples include the determination of surface barriers and the sticking coefficient's analogue, namely the probability that, on colliding with the particle surface, a molecule may continue its diffusion path into the interior. Microimaging is further seen to open new vistas in multicomponent guest diffusion (including the detection of a reversal in the preferred diffusion pathways), in guest-induced phase transitions in nanoporous materials and in matching the results of diffusion studies under equilibrium and non-equilibrium conditions.
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Acknowledgements
This work was partially funded by the German Science Foundation (DFG) and the Netherlands Organization for Scientific Research (NWO) (via the International Research Training Group 'Diffusion in Porous Materials', and the DFG research unit FOR 877 'From Local Constraints to Macroscopic Transport'), DECHEMA (via Max-Buchner-Forschungsstiftung) and Fonds der Chemischen Industrie.
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Kärger, J., Binder, T., Chmelik, C. et al. Microimaging of transient guest profiles to monitor mass transfer in nanoporous materials. Nature Mater 13, 333–343 (2014). https://doi.org/10.1038/nmat3917
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