The authors gratefully acknowledge the financial support provided by MIUR (PRIN2008), Italy.
Synthesis of a Ni-Containing Porous SiOC Material From Polyphenylmethylsiloxane by a Direct Foaming Technique†
Article first published online: 18 JUN 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Special Issue: Highly Porous Metals and Ceramics
Volume 14, Issue 12, pages 1116–1122, December 2012
How to Cite
Idesaki, A. and Colombo, P. (2012), Synthesis of a Ni-Containing Porous SiOC Material From Polyphenylmethylsiloxane by a Direct Foaming Technique. Adv. Eng. Mater., 14: 1116–1122. doi: 10.1002/adem.201100354
- Issue published online: 6 DEC 2012
- Article first published online: 18 JUN 2012
- Manuscript Accepted: 20 APR 2012
- Manuscript Received: 23 DEC 2011
- MIUR. Grant Number: PRIN2008
A Ni-containing porous silicon oxycarbide (SiOC) material was produced from a blend of polyphenylmethylsiloxane (PPMS), azodicarbonamide (ADA) and nickel(II) acetylacetonate (Ni(acac)2) by a direct foaming technique. Homogeneous foaming of PPMS with well-controlled macropore size distribution in the range of 0.1–0.5 mm was achieved, by controlling parameters such as the composition of starting mixture, the heating rate and the sample aspect ratio. A porous SiOC material with metallic Ni was obtained by pyrolysis below 900 °C in Ar. However, open porosity of the obtained porous SiOC was about only 37%. Therefore, the addition of fillers or an extraction treatment process were examined in order to obtain high levels of open, interconnected porosity. It was found that the extraction treatment of foamed PPMS by ethanol is effective in producing highly open porous SiOC ceramics. The Ni-containing porous SiOC material synthesized by this treatment possessed an open porosity of about 70% and gas permeability constant of 4.10 × 10−10 m2 for k1 (Darcian permeability constant) and 3.17 × 10−6 m for k2 (non-Darcian permeability constant). These values are sufficiently high for its application as a catalyst material. According to the results above, the synthesis of a Ni-catalyst supported on a porous SiOC ceramic by a simple one-pot process was demonstrated.