Synthesis of hierarchical porous silicon oxycarbide ceramics from preceramic polymer and wood biomass composites |
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| Affiliation: | 1. Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-Cho, Naka-Ku, Sakai, Osaka 599-8531, Japan;2. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427, USA;1. Dipartimento di Ingegneria Industriale, Università di Trento, Via Mesiano 77, 38123 Trento, Italy;2. Fachbereich Material-und Geowissenschaften, Technische Universität, Darmstadt, Petersenstr. 32, 64287 Darmstadt, Germany;3. Chemical Faculty, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland |
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| Abstract: | Hierarchical porous SiOC ceramics were successfully prepared using a polysiloxane preceramic polymer mixed with wood biomass by annealing at different temperatures under Ar atmosphere. These SiOC ceramics display a trimodal pore size distribution in the micro-, meso- (micropores + mesopores, 1.7–14 nm) and macro-size scale (1–15 μm). The mesopores and micropores mainly originate from the formation of large amounts of SiC crystals and nanowires, graphite-like microcrystallites, and nm-scale pores of ray parenchyma cells and pits of the wood biomass. The SiOC sample prepared at a higher temperature processes the specific surface area up to 180.5 m2/g. The specific surface area, pore volume and average pore width of the samples can be controlled by adjusting the pyrolysis temperature. |
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| Keywords: | Sintering Hierarchical pore structure Preceramic polymer Porous ceramic SiC nanowires |
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