Synthesis and characterization of SiC materials with hierarchical porosity obtained by replication techniques |
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Authors: | Sonnenburg Kirstin Adelhelm Philipp Antonietti Markus Smarsly Bernd Nöske Robert Strauch Peter |
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Institution: | Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Am Muehlenberg 1, D-14476 Golm, Germany. |
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Abstract: | Porous silicon carbide monoliths were obtained using the infiltration of preformed SiO(2) frameworks with appropriate carbon precursors such as mesophase pitch. The initial SiO(2) monoliths possessed a hierarchical pore system, composed of an interpenetrating bicontinuous macropore structure and 13 nm mesopores confined in the macropore walls. After carbonization, further heat treatment at ca. 1,400 degrees C resulted in the formation of a SiC-SiO(2) composite, which was converted into a porous SiC monolith by post-treatment with ammonium fluoride solution. The resulting porous SiC featured high crystallinity, high chemical purity and showed a surface area of 280 m(2) g(-1) and a pore volume of 0.8 ml g(-1). |
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