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  4. Asymmetric mullite membranes manufactured by phase-inversion tape casting from polymethylsiloxane and aluminum diacetate
 
Zitierlink DOI
10.26092/elib/2615
Verlagslink DOI
10.1016/j.memsci.2019.03.047

Asymmetric mullite membranes manufactured by phase-inversion tape casting from polymethylsiloxane and aluminum diacetate

Veröffentlichungsdatum
2019-04-02
Autoren
Nishihora, Rafael Kenji  
Rudolph, Ellen  
Quadri, Mara  
Hotza, Dachamir  
Rezwan, Kurosch  
Wilhelm, Michaela  
Zusammenfassung
Polymethylsiloxane (MK) and aluminum diacetate have been stoichiometrically combined to synthesize a mullite-based powder (3Al2O3·2SiO2) at 850 °C (5 h) or 1200 °C (3 h). High-purity crystalline mullite (>99%) was obtained by heating the mixture in the air (thermal oxidation) at 1200 °C for 3 h, mainly due to the for-
mation of highly reactive silica and alumina precursors. Afterward, the mullite-based powders were used to prepare planar asymmetric microfiltration membranes by phase-inversion tape casting. The green membranes were sintered at 1600, 1650 or 1700 °C during 2 h. The asymmetric morphology identified in the membranes by scanning electron microscopy analysis reveals a thin skin-layer (microfiltration layer,<10 μm) followed by a porous support, in which two different structures were observed: finger- and/or sponge-like layer. Water permeation performance in a dead-end configuration was investigated at different pressures (3, 4, and 5 bar). The obtained results clearly indicated an improved water permeation flux compared to a symmetric commercial
membrane (133.6 m³/m2·h compared to 14.7 m³/m2·h, respectively, at 5 bar). This observation could be ascribed to the asymmetric morphology resultant from the phase-inversion process.
Schlagwörter
Polysiloxane

; 

Ceramic membrane

; 

Tape casting

; 

Phase inversion

; 

Mullite
Verlag
Elsevier {BV}
Institution
Universität Bremen  
Fachbereich
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04)  
Institute
Fachgebiet 17: Keramische Werkstoffe und Bauteile  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Journal of Membrane Science  
Band
581
Startseite
421
Endseite
429
Seitenzahl
9
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Name

NISHIHORA - Asymmetric mullite membranes.pdf

Size

2.05 MB

Format

Adobe PDF

Checksum

(MD5):985b22e128d37826df6cce9be595febc

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