Multiphased assembly of nanoporous silica particles
Multiphased assembly of nanoporous silica particles
复制标题
纳米多孔二氧化硅颗粒的多相组装
DOI：
10.1016/s0022-3093(01)00434-3
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发表时间：
2001
影响因子：
3.5
通讯作者：
C. Brinker
中科院分区：
文献类型：
--
作者：
H. Fan;F. Swol;Yunfeng Lu;C. Brinker
多孔二氧化硅纳米颗粒具有明确的介孔和空隙被描述。二氧化硅纳米颗粒是在快速气溶胶过程中产生的。在气溶胶生成过程中，溶剂的蒸发导致多相组装被限制在含有聚苯乙烯球/二氧化硅、聚苯乙烯球/表面活性剂/二氧化硅或微乳液/二氧化硅的气溶胶液滴中。去除表面活性剂、聚合物球和微乳液后，得到的材料表现出可控的中观和宏观孔隙度。利用透射电镜和氮吸附等温线对多孔二氧化硅颗粒进行了表征。聚苯乙烯球模板化的二氧化硅颗粒具有100nm的空隙。表面活性剂作为二级模板，用于形成中间相以连接大孔。对于微乳液模板二氧化硅纳米颗粒，孔隙率和细胞大小由油的量和膨胀分子的大小控制。
Porous silica nanoparticles with well-defined mesopores and voids are described. The silica nanoparticles are produced in a rapid aerosol process. The evaporation of solvent during aerosol generation induces multiphased assembly confined to an aerosol droplet containing polystyrene spheres/silica, polystyrene spheres/surfactant/silica or microemulsions/silica. After removal of surfactants, polymer spheres, and microemulsion, the resulting materials exhibit controlled meso- and macro-porosity. TEM and nitrogen sorption isotherms have been used to characterize the porous silica particles. The silica particles templated by polystyrene spheres possess 100 nm voids. The surfactants, as secondary templates, are used to form a mesophase to interconnect the macropores. For the microemulsion-templated silica nanoparticles, the porosity and cell size are controlled by the amount of oil and the size of the swelling molecule.