Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 48, Pages 14580-14583Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201506954
Keywords
diffusion; Fick's laws; metal-organic frameworks; nanoporous materials; zeolites
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Funding
- German Science Foundation (DFG)
- Fonds der Chemischen Industrie
- Alexander von Humboldt Foundation
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Diffusion in nanoporous host-guest systems is often considered to be too complicated to comply with such simple relationships as Fick's first and second law of diffusion. However, it is shown herein that the microscopic techniques of diffusion measurement, notably the pulsed field gradient (PFG) technique of NMR spectroscopy and microimaging by interference microscopy (IFM) and IR microscopy (IRM), provide direct experimental evidence of the applicability of Fick's laws to such systems. This remains true in many situations, even when the detailed mechanism is complex. The limitations of the diffusion model are also discussed with reference to the extensive literature on this subject.
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