Publikationen

Asymmetric polysilazane-derived ceramic structures with multiscalar porosity for membrane applications

Autor(en)
Thomas Konegger, Chen Chih Tsai, Herwig Peterlik, Stephen E. Creager, Rajendra K. Bordia
Abstrakt

Novel ceramic structures with multi-scalar porosity were developed using a single preceramic poly(vinyl)silazane to generate asymmetric Si-C-N-based membranes through pyrolytic conversion. Macroporous supports in planar-disc configuration were prepared through a sacrificial filler approach, intermediate structures and microporous layers were deposited via dip-coating. Microporosity in the selective layer was generated through a controlled thermal decomposition of the precursor component in nitrogen atmosphere at temperatures up to 600 °C, resulting in micropores with average pore sizes of 0.8 nm, as investigated by nitrogen adsorption and small-angle X-ray scattering (SAXS). The general feasibility of the single-precursor approach towards selective permeation of gaseous species was demonstrated by the investigation of gas permeances of the generated structures using single-gas permeance testing of He, N2, Ar, C2H6, and CO2. By variation of the deposition sequence during preparation of the selective layer by dip-coating, asymmetric structures with ideal permselectivities exceeding predicted Knudsen values were obtained. At 500 °C, He/N2 and He/CO2 permselectivities of up to 3.1 and 4.1 were found, respectively, at He permeances up to 3 × 10−8 mol m−2 Pa−1 s−1. The new single-material system is a first step towards the potential establishment of new, alternative membrane materials systems, circumventing thermal and chemical incompatibilities between constituents, and increasing material performance due to the applicability under extreme operating conditions.

Organisation(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
Clemson University, Technische Universität Wien
Journal
Microporous and Mesoporous Materials
Band
232
Seiten
196-204
Anzahl der Seiten
9
ISSN
1387-1811
DOI
https://doi.org/10.1016/j.micromeso.2016.06.027
Publikationsdatum
09-2016
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie, 103018 Materialphysik
Schlagwörter
ASJC Scopus Sachgebiete
Materials Science(all), Mechanics of Materials, Chemistry(all), Condensed Matter Physics
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/asymmetric-polysilazanederived-ceramic-structures-with-multiscalar-porosity-for-membrane-applications(a19aa5ba-7278-4fff-b17e-5a226d4f8937).html