Benefit of Microscopic Diffusion Measurement for the Characterization of Nanoporous Materials |
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| Authors: | J. Kärger J. Caro P. Cool M.‐O. Coppens D. Jones F. Kapteijn F. Rodríguez‐Reinoso M. Stöcker D. Theodorou E. F. Vansant J. Weitkamp |
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| Affiliation: | 1. Faculty of Physics and Geosciences, University of Leipzig, Germany;2. Institute of Physical Chemistry and Electrochemistry, Leibniz University, Hannover, Germany;3. Laboratory of Adsorption and Catalysis, Department of Chemistry, University of Antwerp, Wilrijk, Belgium;4. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, USA;5. DelftChemTech, Delft University of Technology, The Netherlands.;6. Institut Charles Gerhardt de Montpellier, UMR CNRS, France;7. Department of Inorganic Chemistry, University of Alicante, Spain;8. Department of Hydrocarbon Process Chemistry, SINTEF Materials and Chemistry, Oslo, Norway;9. School of Chemical Engineering, National Technical University of Athens, Greece;10. Institute of Chemical Technology, University of Stuttgart, Germany |
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| Abstract: | Detailed knowledge of the transport properties of nanoporous materials is a prerequisite for their complete characterization and optimum technological exploitation. One of the best ways to attain this information is provided by the “microscopic” techniques of diffusion measurement, in particular by the pulsed field gradient technique of NMR and by interference microscopy and IR microscopy. Starting with the measuring principles, the various types of evidence as accessible by these techniques are illustrated. A large variety of host‐guest systems with both ordered and random pore networks have been studied, from microporous up to macroporous materials. The information obtained concerns diffusivities in the various pore domains, extra resistances at the interfaces between them and the associated exchange rates. |
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| Keywords: | Diffusion Interference microscopy IR‐spectroscopy Nanoporous materials NMR Transport resistances |
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