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ANSTO Publications Online >
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Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/3081
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| Title: | Synthesis of nanoporous silicon carbide via the preceramic polymer route. |
| Authors: | Maddocks, AR Cassidy, DJ Jones, AS Harris, AT |
| Keywords: | Porous Materials Carbides X-Ray Diffraction Adsorption Silicon Carbides Polymers |
| Issue Date: | 15-Feb-2009 |
| Publisher: | Elsevier |
| Citation: | Maddocks, A. R., Cassidy, D. J., Jones, A. S., & Harris, A. T. (2009). Synthesis of nanoporous silicon carbide via the preceramic polymer route. Materials Chemistry and Physics, 113(2-3), 861-867. |
| Abstract: | Nanoporous silicon carbide materials were prepared by the pyrolysis of the preceramic polymer, polycarbosilane (PCS), with and without the addition of an inert filler (nano- and micron-sized silicon carbide powders). Hydrosilylation crosslinking of PCS with divinylbenzene prior to pyrolysis appeared to have little influence on the development of micro- and mesoporosity. Maximum micropore volumes were 0.28 cm3 g−1 for non-crosslinked PCS and 0.25, 0.33 and 0.32 cm3 g−1 for PCS crosslinked with 2, 6 and 10 wt.% DVB respectively. Micropore volumes decreased under hydrothermal conditions to 0.03 cm3 g−1 for non-crosslinked and 0 cm3 g−1 for crosslinked PCS. Porosity was also lost at temperatures above 700°C. The addition of nano-sized SiC powders to PCS prior to pyrolysis maintained mesoporosity to temperatures of 1200°C, however, micron-sized SiC powders did not maintain porosity above 800°C. The modal pore size in pellets formed by compressing micron-sized powders with the preceramic polymer was 5 μm compared to 30 nm when nano-sized powders were used. © 2009, Elsevier Ltd. |
| URI: | http://dx.doi.org/10.1016/j.matchemphys.2008.08.064 http://apo.ansto.gov.au/dspace/handle/10238/3081 |
| ISSN: | 0254-0584 |
| Appears in Collections: | Journal Articles |
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