摘要
以混甲酚和甲醛为原料 ,经溶胶 -凝胶合成、酸洗老化、超临界干燥得有机气凝胶 ,密度 0 1 5 0 7g/cm3,进一步炭化得炭气凝胶。采用正交试验方法重点考察了炭化工艺条件对炭气凝胶结构和性能的影响 ,并用TEM、TG、低温N2 吸附等手段进行了表征。结果表明 ,炭化工艺条件影响因素顺序为 :升温速率 >炭化终温 >维温时间 ,最佳炭化条件下炭气凝胶密度为 0 2 60g/cm3,比表面积 1 0 2 2m2 /g ,平均孔径 5 6nm。TEM结果表明 :炭气凝胶具有典型的连续的三维网络结构。
Carbon aerogels are unique porous carbon materials whose composition, structure and properties can be controlled at nanometer scale In this paper, cresol mixture firstly as raw material, by sol-gel polymerization, acid aging, supercritical fluid drying and pyrolysis result in the formation of aerogels and carbon aerogels The effect of operating condition of pyrolysis on structure and porperties of carbon aerogels are investigated through orthogonal experiment TG, TEM and N 2 absorption are used to characterize carbon aerogels The results show that operating condition order of pyrolysis is as: heating rate>pyrolysis final temperature>holding time The density of carbon aerogels is 0 260g/cm 3 under optimal operating condition while the pores size is typically smaller than 50nm
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2000年第1期33-35,共3页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金资助项目! ( 5 9672 0 2 6)
关键词
炭气凝胶
混合甲酚
甲醛
炭化
凝胶
carbon aerogells, cresol mixture, sol-gel, supercritical drying, pyrolysis
