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Citation link: https://doi.org/10.26092/elib/2496

Publisher DOI: https://doi.org/10.1016/j.jeurceramsoc.2015.09.018
H. Zhang, P.D. Nunes, M. Wilhelm, K. Rezwan, Hierarchically ordered micro-meso-macroporous_2016_accepted version_Deckblatt_pdfa1.pdf
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Hierarchically ordered micro/meso/macroporous polymer-derived ceramic monoliths fabricated by freeze-casting


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H. Zhang, P.D. Nunes, M. Wilhelm, K. Rezwan, Hierarchically ordered micro-meso-macroporous_2016_accepted version_Deckblatt_pdfa1.pdf2.04 MBAdobe PDFView/Open
Authors: Zhang, Huixing  
D’Angelo Nunes, Pedro 
Wilhelm, Michaela  
Rezwan, Kurosch  
Abstract: 
A hierarchically-ordered macro/meso/microporous SiOC monolith was obtained via freeze-casting using commercial polysiloxane as a raw material and silica sol as a binder and template source. The pre-ceramic polymer polysiloxane was pyrolyzed at 600 °C to produce a hydrophilic surface; higher temperatures would fully decompose the organic groups. When silica sol and polysiloxane precursor were combined in freeze-casting method, after pyrolysis a polymer-derived SiOC ceramic monolith with a lamellar pore morphology and a hierarchically-ordered pore structure was obtained. Decomposition of the polysiloxane precursors results in the development of micropores, and particle packing is believed to be responsible for the mesopore formation. Macro/mesoporous hierarchically-ordered ceramics with a specific surface area of 74 m2/g are preserved at pyrolysis temperatures as high as 1000 °C. The influence of H44-derived filler amount (10 wt–40 wt%), freezing temperature (−20 °C, −80 °C, −150 °C), and pyrolysis temperature (600 °C, 700 °C, 1000 °C) on open porosity, pore size distribution, and surface characteristics were investigated.
Keywords: Hierarchical pore structure; Polysiloxanes; Freeze casting; Ice template; Silicon oxycarbide (SiOC); Mimenima
Issue Date: 17-Oct-2015
Publisher: Elsevier Science
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Journal of the European Ceramic Society 
Issue: 1
Start page: 51
End page: 58
Volume: 36
Type: Artikel/Aufsatz
ISSN: 0955-2219
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2496
URN: urn:nbn:de:gbv:46-elib71762
Institution: Universität Bremen 
Appears in Collections:Forschungsdokumente

  

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