Preparation of SiO_2 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.