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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Facile synthesis of resorcinol-formaldehyde/silica composite aerogels and their transformation to monolithic carbon/silica and carbon/silicon carbide composite aerogels
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Facile synthesis of resorcinol-formaldehyde/silica composite aerogels and their transformation to monolithic carbon/silica and carbon/silicon carbide composite aerogels

机译：间苯二酚-甲醛/二氧化硅复合气凝胶的轻松合成及其向整体碳/二氧化硅和碳/碳化硅复合气凝胶的转化

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摘要

Resorcinol-formaldehyde/silica composite (RF/SiO _2) gels were synthesized in one pot by simply mixing the monomers and dried under supercritical carbon dioxide to form RF/SiO _2 aerogels. Carbon/silica composite (C/SiO _2) and carbon/silicon carbide composite (C/SiC) aerogels were formed from the RF/SiO _2 aerogels after carbonization and carbothermal reduction. The as-prepared C/SiC products exhibited a preserved monolithic morphology similar to the original templates and were composed of carbon particles and α-SiC nanocrystals. The C/SiC specimen possessed a BET surface area of 892 m 2/g and a porosity of 94.8%, both of which were significantly higher than the BET surface area and porosity of C/SiO _2 and RF/SiO _2 aerogels. The resulting C/SiC monolith was stable up to temperatures near 550 °C, which is almost 150 °C higher than what C/SiO _2 aerogels can tolerate.
机译：通过简单地混合单体，在一个锅中合成间苯二酚-甲醛/二氧化硅复合物（RF / SiO _2）凝胶，并在超临界二氧化碳下干燥以形成RF / SiO _2气凝胶。碳化和碳热还原后，RF / SiO _2气凝胶形成碳/二氧化硅复合物（C / SiO _2）和碳/碳化硅复合物（C / SiC）气凝胶。所制备的C / SiC产品显示出与原始模板相似的保留的整体形态，并且由碳颗粒和α-SiC纳米晶体组成。 C / SiC样品的BET表面积为892 m 2 / g，孔隙率为94.8％，均明显高于C / SiO _2和RF / SiO _2气凝胶的BET表面积和孔隙率。所得的C / SiC整料在高达550°C的温度下都稳定，这比C / SiO _2气凝胶所能承受的温度高出近150°C。

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