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Angew Chem Int Ed Engl. 2015 Nov 23;54(48):14580-3. doi: 10.1002/anie.201506954. Epub 2015 Oct 8.

Transport in Nanoporous Materials Including MOFs: The Applicability of Fick's Laws.

Author information

1
Department of Interface Physics, University of Leipzig, Linnéstrasse 5, 04103 Leipzig (Germany).
2
Institute of Functional Interfaces, Karlsruher Institut für Technologie, Karlsruhe (Germany).
3
Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, (USA).
4
Department of Chemical Reaction Engineering, Hamburg University of Technology, Hamburg (Germany).
5
Chemical and Biological Engineering, University of Maine, Orono, (USA).
6
Department of Interface Physics, University of Leipzig, Linnéstrasse 5, 04103 Leipzig (Germany). kaerger@physik.uni-leipzig.de.

Abstract

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.

KEYWORDS:

Fick’s laws; diffusion; metal-organic frameworks; nanoporous materials; zeolites

PMID:
26448501
DOI:
10.1002/anie.201506954
[Indexed for MEDLINE]

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