Preparation of monolith SiC aerogel with high surface area and large pore volume and the structural evolution during the preparation |
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| Authors: | Yong Kong Xiaodong Shen Sheng Cui Maohong Fan |
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| Affiliation: | 1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China;2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, PR China;3. Department of Chemical and Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA;4. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA |
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| Abstract: | Resorcinol–formaldehyde/silica composite (RF/SiO2) aerogel was synthesized by sol–gel process followed by supercritical drying (SCD). Monolithic SiC aerogel was obtained from RF/SiO2 aerogel after carbothermal reduction. The evolution of physical property, crystal structure, morphology and pore structure from RF/SiO2 to SiC aerogel was investigated by different methods, such as X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and N2 adsorption/desorption. The as-synthesized SiC aerogel presented typical mesoporous structure and possessed high porosity (91.8%), high surface area (328 m2/g) and large pore volume (2.28 cm3/g). Carbothermal reduction mechanism was also discussed based on the experiment and characterization results. |
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| Keywords: | Sol&ndash gel Supercritical drying Silicon carbide Carbothermal reduction Microstructure |
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