反应物浓度对新型碳气凝胶结构性能的影响

Effect of Reactant Concentrations on the Structure Properties of the New Carbon Aerogels

以间苯三酚（P）、间苯二酚（R）和甲醛（F）为原料,按一定物质的量比混合,配制成不同浓度的反应物水溶液,经过溶胶-凝胶、溶剂置换、常温干燥以及高温碳化等过程,制备出碳气凝胶.采用硬度计测量碳气凝胶的硬度,使用扫描电镜和比表面积分析仪对碳气凝胶的微结构进行表征.结果表明：反应物浓度的改变对碳气凝胶硬度的影响不大;随着反应物浓度的增加,碳气凝胶的比表面积先减小后增加,比表面积范围为800～1200m2/g,孔径分布主要集中在10～30nm.

Carbon aerogels, with different reactant concentrations, were prepared by sol-gel, solvent replace- ment, dry at ambient conditions and pyrolysis process, and with phloroglucinol（P）, resorcinol（R） and formaldehyde （F） as raw materials. The hardness of carbon aerogels were measured by the hardness tester. The microstructure of carbon aerogels were characterized using scanning electron microscopy（SEM） and specific surface area analyzer. The results show that there was little effect on the hardness of carbon aerogels with the change of reactants concentration. With reactant concentrations increasing, the specific surface area of carbon aerogels increased after decreasing first, the range of specific surface area is 800--1200 m2/g, pore size distribution is mainly concentrated in 10--30 nm.