摘要
以富含大孔或大介孔结构的硅胶为原料,在其上通过原位晶化合成具有小介孔-大介孔双孔分布的复合SiO2,并利用N2吸附-脱附、X射线衍射、扫描电镜、透射电子显微镜等手段对SiO2的物化性能和孔分布进行了表征。结果表明,所制备的样品具有双孔分布,孔径分别在3和45nm左右;小介孔的孔结构与MCM-41介孔类似,负载于硅胶表面及大孔孔壁上;大介孔的孔径较硅胶孔径有所减小,但未被完全填充堵塞。通过改变TEOS/大孔硅胶及CTAB/TEOS的配比可以实现对双介孔SiO2孔分布的调控。
A bimodal mesoporous SiO2 was in-situ synthesized by using silica gel with macropore or mesopore as adding material.The prepared SiO2 powders were characterized by N2 adsorption-desorption measurements,Xray diffaraction（XRD）,scanning electron microscopy（SEM）,and transmission electron microscopy（TEM）.The results showed that bimodal mesoporous SiO2 consist of small mesopore of about 3nm and large mesopore of about 45nm.The small mesopores have similar characters with MCM-41 and were formed on surface and pore wall of the silica gel,while large mesopores inherited from parent material silica gel were not blockage.The bimodal mesopore distribution of SiO2 and large mesopore diameter can be adjusted by changing the proportion of TEOS and silica gel or CTAB and TEOS.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第10期1831-1834,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20876113)
