- AutorIn
- Christian Chmelik Faculty of Physics and Earth Sciences, Leipzig University
- Seungtaik HwangFaculty of Physics and Earth Sciences, Leipzig University
- Jörg KärgerFaculty of Physics and Earth Sciences, Leipzig University
- Titel
- Diffusion in Nanoporous Materials: Challenges, Surprises and Tasks of the Day
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa2-807480
- Quellenangabe
- Diffusion fundamentals - 34, Special issue: 'DIMAT-2021 Heft: 34, Special issue: 'DIMAT-2021
Seiten: 1-31
E-ISSN: 1862-4138
Artikelnummer: 06 - Erstveröffentlichung
- 2022
- Abstract (EN)
- Diffusion is an omnipresent, most fundamental phenomenon in nature and thus critical for the performance of numerous technologies. This is in particular true for nanoporous materials with manifold applications for matter upgrading by separation, purification and conversion. The path lengths of molecular transportation within the industrial plants range from the elementary steps of diffusion within the micropores of the individual particles up to the matter flow over macroscopic distances. Each of them might be decisive in determining overall performance so that detailed knowledge of all modes of mass transfer is crucial for a knowledge-based optimization of the devices with reference to their transport properties. The rate of mass transfer is particularly complicated to be assessed within the individual (adsorbent) particles/crystallites with pore sizes of the order of molecular dimensions. We are going to present two powerful techniques exactly for this application, operating under both equilibrium (Pulsed Field Gradient (PFG) NMR) and non-equilibrium (Microimaging by interference microscopy and IR microscopy) conditions. The potentials of these techniques are demonstrated in a few showcases, notably including the options of transport enhancement in pore hierarchies. The contribution concludes with a survey on present activities within an IUPAC initiative aiming at the elaboration of “guidelines for measurements and reporting of diffusion properties of chemical compounds in nanoporous materials”.
- Freie Schlagwörter (EN)
- Diffusion, Zeolites, Pore Hierarchies, Pulsed Field Gradient (PFG) NMR, Microimaging
- Publizierende Institution
- University of Leipzig, Leipzig
- Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:15-qucosa2-807480
- Veröffentlichungsdatum Qucosa
- 22.09.2022
- Dokumenttyp
- Artikel
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis