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  4. The influence of the functional group density on gas flow and selectivity: Nanoscale interactions in alkyl-functionalized mesoporous membranes
 
Zitierlink DOI
10.26092/elib/2485
Verlagslink DOI
10.1016/j.micromeso.2016.09.026

The influence of the functional group density on gas flow and selectivity: Nanoscale interactions in alkyl-functionalized mesoporous membranes

Veröffentlichungsdatum
2017-01-01
Autoren
Besser, Benjamin  
Malik, Saad  
Baune, Michael  
Kroll, Stephen  
Thöming, Jorg  
Rezwan, Kurosch  
Zusammenfassung
Mesoporous inorganic structures with mean pore diameters of 26 nm are prepared by extrusion based on a yttria stabilized zirconia nanopowder. The sintered capillary membranes serve as model structures to investigate the influence of an alkyl-chain (C16) surface functionalization on the gas diffusion kinetics of argon (Ar), nitrogen (N2) and carbon dioxide (CO2) in mesopores. The density of the C16 alkyl-chains immobilized on the membrane surface has an effect on both, gas flow as well as gas selectivity. For low functional group densities (<4 groups nm−2), the gas flow is reduced without having an effect on the selectivity. In contrast, for high alkyl-chain densities (>4 groups nm−2) the mean distance between the C16-chains is reduced to the order of magnitude of the gas molecules leading to a reduction in gas flow and a significant change of the gas selectivity. The selectivity is found to be influenced depending on the molecular diameter of the gas species, being more evident for CO2 compared to Ar and N2, suggesting a separation mechanism more comparable to molecular sieving than to surface diffusion.
Schlagwörter
Mesoporous ceramic membrane

; 

Surface functionalization

; 

Gas permeation

; 

Knudsen diffusion

; 

Mimenima
Verlag
Elsevier
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Zentrum für Umweltforschung und nachhaltige Technologien (UFT)  
MAPEX Center for Materials and Processes  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Microporous and Mesoporous Materials  
Band
237
Startseite
38
Endseite
48
Seitenzahl
11
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

B. Besser, S. Malik, M. Baune, S. Kroll, J. Thöming, K. Rezwan, The influence of the functional group density on gas flow_2017_accepted version.pdf

Size

3.09 MB

Format

Adobe PDF

Checksum

(MD5):4ceb3d4e15762f8a1adba7844cd8a8a0

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