【作者】 熊亮亮； 刘春洋； 张瑜； 蔡建国；

【Author】 Xiong Liang-liang;Liu Chun-yang;Zhang Yu;Cai Jian-guo;School of Chemical Engineering, East China University of Science and Technology;

【机构】 华东理工大学化工学院；

【摘要】 以正硅酸乙酯(TEOS)为硅源,乙醇为溶剂,盐酸和氨水为催化剂,采用溶胶-凝胶法和超临界干燥法制备硅气凝胶和载钌硅气凝胶。通过改变老化温度和老化时间探寻其对硅气凝胶体积收缩率以及密度的影响,结果表明当老化温度为80℃、老化时间为48h时效果最好,此时硅气凝胶的密度为0.1477g/cm3、体积收缩率为2.57%。利用FTIR、SEM、BET、XRD对所得硅气凝胶和载钌硅气凝胶进行表征分析,结果表明所制备的样品具有多孔结构,且孔隙率高、密度小,属于介孔材料,金属钌的加入并未破坏气凝胶的微观结构。更多还原

【Abstract】 Silica aerogel and Ru-supported silica aerogel were prepared by sol-gel method and supercritical drying method by using ethyl orthosilicate(TEOS)as silicon source,EtOH as solvent,hydrochloric acid and ammonia as catalysts.The effects of aging temperature and aging time on the volumetric shrinkage and density of silica aerogel were explored.The results showed that when the aging temperature was 80℃ and the aging time was 48 hours,the density of the silica aerogel was 0.1477 g/cm3 and the volume shrinkage was 2.57%.Silica aerogel and Ru-supported silica aerogel were characterized by FTIR,SEM,BET,XRD.The results suggested that the prepared samples have high porosity and low density,which demonstrated that the prepared samples belonged to mesoporous materials.The addition of metallic ruthenium didn’t destroy the microstructure of the silica aerogel.更多还原