知识与财富的链接
以聚甲基丙烯酸甲酯(PMMA)胶晶为大孔模板、嵌段共聚物P123为介孔模板,利用双模板剂法进行了三维有序大孔-介孔二氧化硅材料的制备研究。采用SEM、TEM、低角XRD以及N2吸脱附技术对样品进行了表征。结果表明,通过简单的调控PMMA胶晶模板的组装过程,就可以调变合成材料中的大孔结构,从而轻松地实现可控的制备出具有网状或者层状结构的三维有序大孔-介孔二氧化硅材料,并提出了其可能的形成机理。此外,所制备的三维有序大孔-介孔二氧化硅样品均具有较大的BET比表面积(>550m2·g-1),大孔孔径200nm左右,介孔孔径分布集中于3.5nm左右。
Three-dimensionally(3D) ordered macro-mesoporous silica monolith was prepared via a facile dual-templating technique using self-made poly-(methyl methacrylate) (PMMA) colloidal crystal and triblockcopolymer P123 as templates. The pore structure, surface features of as-prepared samples were characterized by SEM, TEM, low-angle XRD and N2 adsorption and desorption techniques. The results show that these highly ordered macro-mesoporous silica monoliths have a macropore of about 200 nm, narrowly distributed mesopores (3.5 nm), and high surface area (>550 m2·g-1). These results also indicate that the 3D ordered macro-mesoporous silica monolith with network or layered structure can be prepared controllably by facilely tailoring and controlling the self-assembly process of PMMA colloidal crystal template. The formation mechanism of the 3D ordered macro-mesoporous composites was also proposed.
