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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 >Porous carbon/silica composite monoliths derived from resorcinol-formaldehyde/TEOS
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Porous carbon/silica composite monoliths derived from resorcinol-formaldehyde/TEOS

机译：由间苯二酚-甲醛/ TEOS衍生的多孔碳/二氧化硅复合整料

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摘要

Porous carbon/silica composite monoliths were generated by pyrolyzing the organic/inorganic nanocomposites rendered from co-polymerization of carbon precursor (RF: resorcinol-formaldehyde) and silica precursor (TEOS). For RF/silica composites, the gelation time was greatly reduced, and the weight residual percentage was increased with increasing TEOS content. At a proper reactant ratio, crack-free monolithic RF/silica composites with negligible shrinkage were obtained by ambient pressure drying. The structure of RF/silica and carbon/silica composites was investigated by combining SEM and N-2 adsorption measurements. The results revealed that their textural properties can be tailored by variation of the reactant ratio and the initial pH values. The porous carbon/silica composite with the largest BET surface area of 622 m(2)/g, exhibited mesopores and macropores simultaneously, resulting in a low apparent density about 0.552 g/cm(3).
机译：通过热解由碳前驱物（RF：间苯二酚-甲醛）和二氧化硅前驱物（TEOS）的共聚合得到的有机/无机纳米复合材料，可以生成多孔的碳/二氧化硅复合整料。对于RF /二氧化硅复合材料，随着TEOS含量的增加，胶凝时间大大减少，重量残留百分比增加。在适当的反应物比率下，通过环境压力干燥获得收缩率可忽略的无裂纹的整体式RF /二氧化硅复合材料。通过结合SEM和N-2吸附测量研究了RF /二氧化硅和碳/二氧化硅复合材料的结构。结果表明，可以通过改变反应物比率和初始pH值来调整其质地。具有最大BET表面积622 m（2）/ g的多孔碳/二氧化硅复合材料同时显示出中孔和大孔，从而导致表观密度较低，约为0.552 g / cm（3）。

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