Nanoporous glass as a model system for a consistency check of the different techniques of diffusion measurement

Christian Chmelik, Dirk Enke, Petrik Galvosas, Oliver Gobin, Andreas Jentys, Hervé Jobic, Jörg Kärger, Cordula B. Krause, Jens Kullmann, Johannes Lercher, Sergej Naumov, Douglas M. Ruthven, Tobias Titze

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The remarkable differences in the guest diffusivities in nanoporous materials commonly found with the application of different measuring techniques are usually ascribed to the existence of a hierarchy of transport resistances in addition to the diffusional resistance of the pore system and their differing influence due to the differing diffusion path lengths covered by the different measuring techniques. We report diffusion measurements with nanoporous glasses where the existence of such resistances could be avoided. Molecular propagation over diffusion path lengths from hundreds of nanometers up to millimeters was thus found to be controlled by a uniform mechanism, appearing in coinciding results of microscopic and macroscopic diffusion measurement. The remarkable differences in the guest diffusivities in nanoporous materials found with the application of different measuring techniques are usually ascribed to the existence of a hierarchy of transport resistances. Diffusion measurements with nanoporous glasses where the existence of such resistances could be avoided are reported (see picture).

Original languageEnglish
Pages (from-to)1130-1134
Number of pages5
JournalChemPhysChem
Volume12
Issue number6
DOIs
StatePublished - 18 Apr 2011

Keywords

  • adsorption
  • diffusion
  • glasses
  • interfaces
  • nanoporous materials
  • neutron scattering
  • nmr spectroscopy

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