Synthesis of SiC nanorods from bleached wood pulp |
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Authors: | Yongsoon Shin Chongmin Wang William D Samuels Greg J Exarhos |
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Affiliation: | Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, MS K2-44, Richland, WA 99354, United States |
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Abstract: | Unbleached and bleached soft wood pulps have been used as templates and carbon precursors to produce SiC nanorods. Hydrolyzed tetraethylorthosilicate (TEOS), silicic acid was infiltrated into the pulps followed by a carbothermal reduction to form SiC nanorods at 1400 °C in Ar. Residual carbon formed along with SiC was removed by gasification at 700 °C in air. The SiC materials prepared from unbleached pulp were non-uniform SiC with a thick SiO2 coating, while the SiC nanorods prepared from the bleached pulp were uniform and straight with dimensions of 250 nm in diameter and 5.0 mm long. The formation of uniform camelback structure of SiC in the reaction between silica and bleached pulp is attributed to more silica deposited in the amorphous region of cellulose. |
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Keywords: | Silicon carbide Cellulose Pulp Lignin Nanorods |
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