用模板法制备炭气凝胶及性能表征

Synthesis and Characterization of Carbon Aerogel Using Template

以柠檬酸和聚丙烯酸作为模板剂,采用一氧化碳还原法,还原锌基复合气凝胶,制备出炭气凝胶,开发出了一种炭气凝胶制备的新技术;通过用场发射扫描电镜(FESEM)与氮气吸脱附测试对气凝胶的微观结构进行了表征,结果表明:以柠檬酸为模板剂时,气凝胶的微观结构较密实,多孔现象不明显,比表面积370 m2/g,孔径分布在4~10 nm;以聚丙烯酸为模板剂时,孔洞分布均匀,具有典型的三维网络结构,其比表面积为1 860 m2/g,孔径分布在6~60 nm.

In this study,we developed the innovation of carbon aerogel through thermal treatment in CO using citric acid and polyacrylic acid as templates,which employed the properties of high apparent specific surface areas. By adopting field-emmision scanning electron microscope（ FESEM） and N2 adsorption / desorption,we learned that the carbon aerogel using citric acid as template has a three-dimensional porous structure featuring high surface area（ 370 m^2/ g）,average pore diameter about 10 ~ 60 nm. The measurements showed that the aerogel using polyacrylic acid as template has higher BET surface area of 1 860 m^2/ g,average pore diameter about 6~ 60 nm,which means the aerogel possesses the typical characteristic of mesopore.