漂浮法制备SiO2有序大孔材料

用漂浮组装方法以亚微米尺度单分散的聚苯乙烯(PS)微球作为模板, 在悬浮液气-液界面处组装PS模板微球与纳米级胶体颗粒, 形成二元胶体颗粒共混物, 再去除模板得到有序大孔材料.

Preparation of SiO2 Ordered Macroporous Material by Floating Assembly Method

Floating assembly method is a new way for preparing ordered macroporous materials. In this process, the co-mixture of binary colloidal particles was fabricated through the rapid assembly of polystyrene(PS) as a template and SiO2 nanoparticles at the air-water interface of the suspension, the ordered macroporous materials were obtained by removing the template. Scanning Electron Micrographs(SEM) show that macroporous material had regular close-packed face-centered cubic(fcc) structure and spaces left by templates were connected through some windows. The results indicate that the formation of ordered porous structure was influenced by the diameter of PS microspheres remarkably. When the diameter was in the range of 200—500 nm the ordered structure could be obtained easily. And the volume ratio of PS microspheres to SiO2 nanoparticles in the maxed suspension wasn't primary factor of the the formation of the ordered structure.