摘要
利用廉价的硅酸盐为二氧化硅前驱体 ,以非离子和阳离子表面活性剂为混合模板剂合成微米级的介孔二氧化硅。控制非离子和阳离子表面活性剂的量可以得到分散性较好的介孔二氧化硅球 ,其平均颗粒直径为 2 .5 μm ,平均孔径为 3 .2 5nm ,比表面为 1 3 79m2 g ,孔体积高达 1 .1 2cm3 g。实验讨论了两种表面活性剂的比例对介孔二氧化硅形貌和介相结构的影响 ,并用混合模板机理解释了不同形貌形成的原因。
Mesoporous silica spheres with diameters in the microscale have been synthesized by using inexpen- sive sodium silicate as silica source. It was shown that completely spherical mesoporous silica could be obtained by controlling the molar ratios of cationic/nonionic surfactants in syntheses. The mesoporous material exhibited a narrow size distribution of mesospores (2～4nm), high specific surface area (1379m 2/g) and high pore volume (1.12cm 3/g). The effects of different molar ratios of nonionic/cationic surfactant on the morphologies and the mesostructures of mesoporous silica have been examined and mixed templating pathway was proposed for the formation of the different morphologies.
出处
《化学通报》
CAS
CSCD
北大核心
2005年第2期140-144,149,共6页
Chemistry
基金
国家 8 6 3计划 (AA2 0 0 2 30 2 10 8)
国家自然科学基金 (2 0 30 10 15 )资助项目
