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Citation link: https://doi.org/10.26092/elib/2485

Publisher DOI: https://doi.org/10.1016/j.micromeso.2016.09.026
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
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The influence of the functional group density on gas flow and selectivity: Nanoscale interactions in alkyl-functionalized mesoporous membranes


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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.pdf3.16 MBAdobe PDFView/Open
Authors: Besser, Benjamin  
Malik, Saad 
Baune, Michael 
Kroll, Stephen  
Thöming, Jorg  
Rezwan, Kurosch  
Abstract: 
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.
Keywords: Mesoporous ceramic membrane; Surface functionalization; Gas permeation; Knudsen diffusion; Mimenima
Issue Date: 1-Jan-2017
Publisher: Elsevier
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Microporous and Mesoporous Materials 
Start page: 38
End page: 48
Volume: 237
Pages: 11
Type: Artikel/Aufsatz
ISSN: 13871811
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2485
URN: urn:nbn:de:gbv:46-elib71643
Institution: Universität Bremen 
Faculty: Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) 
Institute: Zentrum für Umweltforschung und nachhaltige Technologien (UFT) 
MAPEX Center for Materials and Processes 
Appears in Collections:Forschungsdokumente

  

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