Mesoporöse Glasmembranen als Modellsysteme zur Untersuchung der Gasdiffusion durch poröse Medien

Stoltenberg, Daniel; Seidel‐Morgenstern, A.; Enke, Dirk

doi:10.1002/cite.201000021

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…The fabrication of a homogeneous nanoporous material with all additional transport resistances excluded, yielding coinciding results in micro-and macroscopic measurements, however, turned out to be quite a challenge. Specially prepared nanoporous glasses which are statistically homogeneous over macroscopic distances [137] eventually provided a practically reasonable host system for such studies.…”

Section: Microscopic Vs Macroscopic Measurementsmentioning

confidence: 99%

Transport Phenomena in Nanoporous Materials

2014

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Diffusion, that is, the irregular movement of atoms and molecules, is a universal phenomenon of mass transfer occurring in all states of matter. It is of equal importance for fundamental research and technological applications. The present review deals with the challenges of the reliable observation of these phenomena in nanoporous materials. Starting with a survey of the different variants of diffusion measurement, it highlights the potentials of "microscopic" techniques, notably the pulsed field gradient (PFG) technique of NMR and the techniques of microimaging by interference microscopy (IFM) and IR microscopy (IRM). Considering ensembles of guest molecules, these techniques are able to directly record mass transfer phenomena over distances of typically micrometers. Their concerted application has given rise to the clarification of long-standing discrepancies, notably between microscopic equilibrium and macroscopic non-equilibrium measurements, and to a wealth of new information about molecular transport under confinement, hitherto often inaccessible and sometimes even unimaginable.

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Section: Microscopic Vs Macroscopic Measurementsmentioning

confidence: 99%

Transport Phenomena in Nanoporous Materials

2014

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“…Especially the group of controlled pore glasses combines the advantages of well-adjustable homogenous pore sizes over a very broad range (∼2 to >1000 nm), high mechanical, chemical and thermal stability with very flexible macroscopic shapes (monoliths, plates, beads, granules, powder). In previous works, controlled pore glasses such as porous micro glass beads (PMGB) were established as general model systems, including studies of gas transport processes inside the porous system, 1 a consistency check of the different techniques of diffusion measurements was introduced, 2 and glass monoliths were investigated by combining nitrogen adsorption and positronium annihilation lifetime spectroscopy. 3 Moreover, magnetic resonance microimaging of transient concentration profiles of reactant and product molecules during catalytic conversion in porous glasses 4 and the analysis of water-based functionalization of mesoporous glasses with 3-aminopropyl-triethoxysilane 5 were further objectives.…”

Section: Introductionmentioning

confidence: 99%