结构有序、双重孔隙中孔炭材料的合成与表征

采用纳米涂层技术,以介孔分子筛SBA 15为模板,在其纳米孔道内引入糠醇/草酸溶液,经原位聚合,炭化后制得炭/SBA 15复合物。采用化学法脱除模板后制得具有规则结构的中孔炭。高分辨TEM表征结果显示该中孔炭是由纳米炭管相互联接、堆积而成,且具有六方对称结构。氮吸附结果显示其比表面积高达2000m2/g,孔径呈双峰分布。孔径相对较大的孔隙来源于SBA 15孔道经纳米涂层后所保留的孔隙;孔径相对较小的孔隙来源于SiO2移除后遗留的纳米孔空间。该方法可应用于以其他多孔氧化硅为模板制备新型纳米复合物的研究过程。

Simplified novel synthesis of ordered mesoporous carbon with a bimodal pore system

Ordered mesoporous carbon (OMC) with a bimodal pore system and high surface area has been synthesized by using SBA-15 as template and furfuryl alcohol as carbon source. The mesoporous surface area of the resultant OMC is as high as 2 000 m2/g. The pore size distribution shows a clear bimodal type. One mode of porosity with relatively small pore size originated from the void space created after removal of the silica matrix, and another with a relatively large pore size was generated from the center spaces inside of the hollow carbon tubes. Compared to the previous report, the advantages of the current synthesis strategy are that it involves one fewer step and that the amount of carbon precursor realized is determined simply by changing the concentration of the furfuryl alcohol solution. The current method is generally applicable to porous silica for thin layer coating with carbon, establishing access to valuable materials for the synthesis of new nanocomposites.