Cover Picture: Nanoporous Glass as a Model System for a Consistency Check of the Different Techniques of Diffusion Measurement (ChemPhysChem 6/2011) (page 1025)
Dr. Christian Chmelik, Prof. Dr. Dirk Enke, Dr. Petrik Galvosas, Oliver Gobin, Dr. Andreas Jentys, Dr. Hervé Jobic, Prof. Dr. Jörg Kärger, Cordula B. Krause, Jens Kullmann, Prof. Dr. Johannes Lercher, Dr. Sergej Naumov, Prof. Dr. Douglas M. Ruthven and Tobias Titze
Article first published online: 8 APR 2011 | DOI: 10.1002/cphc.201190028
Diffusion, that is, the Brownian motion of guest molecules, is often decisive in the performance of nanoporous host materials in their technological applications. In general, different techniques with differing length scales of observation yield notably differing diffusivities as a consequence of the existence of additional transport resistances acting in addition to the diffusional resistance of the pore space. These resistances are avoided in specially prepared nanoporous glasses, yielding coinciding diffusivities in macroscopic and microscopic measurements, as shown by J. Kärger et al. on p. 1130.