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Citation link: https://doi.org/10.26092/elib/2498

Publisher DOI: https://doi.org/10.1111/jace.14782
H. Zhang, C.L. Fidelis, A. Serva, M. Wilhelm, K. Rezwan, Waterbased freez casting-adjusting hxdrophobic polymethylsiloxane_2017_accepted version.pdf
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Water-based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC


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H. Zhang, C.L. Fidelis, A. Serva, M. Wilhelm, K. Rezwan, Waterbased freez casting-adjusting hxdrophobic polymethylsiloxane_2017_accepted version.pdf4.98 MBAdobe PDFView/Open
Authors: Zhang, Huixing  
Fidelis, Clara Lana 
Serva, Ana Luiza Teixeira 
Wilhelm, Michaela  
Rezwan, Kurosch  
Abstract: 
The hydrophobic properties of methyl poly siloxane (MK) were pushed into the“hydrophilic”range by cross-linking it with (3-aminopropyl)triethoxysilane(APTES) and subsequent pyrolysis to enable water-based freeze casting. Fillerproperties are investigated by varying the ratios of MK to APTES (1:1, 1:2, 1:3,1:4, 1:5), and pyrolysis temperatures (400°C, 500°C, 600°C) for the purpose ofdetermining an optimal set of characteristics for freeze casting. Additionally, fillerselection for this purpose is facilitated by analysis of zeta potential values andvapor adsorption. It was found that water-based freeze casting with hybrid fillers,followed by a pyrolysis step (600°C-700°C), leads to a SiOC ceramic monolithwith a lamellar pore morphology and a hierarchically ordered micro/meso/macrop-ore structure. Samples pyrolyzed at 1000°C contain mesopores, having a SSA ashigh as 51.6 m2/g. The hierarchically porous structure is very promising for appli-cations involving gas or liquid transportation.
Keywords: freeze casting; micro/meso/macropore; polymer derived ceramics; silicon oxycarbide; surfacecharacteristics; Mimenima
Issue Date: 7-May-2017
Publisher: Wiley
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Journal of the American Ceramic Society 
Issue: 5
Start page: 1907
End page: 1918
Volume: 100
Pages: 12
Type: Artikel/Aufsatz
ISSN: 00027820
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2498
URN: urn:nbn:de:gbv:46-elib71784
Institution: Universität Bremen 
Faculty: Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) 
Appears in Collections:Forschungsdokumente

  

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