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Benefit of Microscopic Diffusion Measurement for the Characterization of Nanoporous Materials
Author(s) -
Kärger J.,
Caro J.,
Cool P.,
Coppens M.O.,
Jones D.,
Kapteijn F.,
RodríguezReinoso F.,
Stöcker M.,
Theodorou D.,
Vansant E. F.,
Weitkamp J.
Publication year - 2009
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200900160
Subject(s) - microporous material , characterization (materials science) , pulsed field gradient , nanoporous , diffusion , materials science , interference microscopy , nanotechnology , porous medium , microscopy , chemical physics , porosity , chemistry , thermodynamics , physics , optics , composite material
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.