单分散核-壳结构介孔二氧化硅微球的合成

Synthesis of Monodisperse Silica Microspheres with Solid Core and Mesopore Shell

在酸性条件下,采用非离子表面活性剂嵌段共聚物为模板剂,季铵盐阳离子表面活性剂为共导向剂,在预先合成的尺寸均一的单分散实心氧化硅微球表面包裹了有序介孔氧化硅层,进一步通过高温水热处理,获得了具有良好分散性和均匀尺寸的介孔壳层(孔径7 nm)氧化硅微球(～500 nm).氧化硅微球外部包裹的介孔壳层具有较大的比表面积(188 m2/g)和孔容(0.23 cm3/g).

Well-dispersed silica microspheres（～500 nm） with solid core and ordered mesopore shell were synthesized by amphiphilic triblock copolymers（Pluronic P123） and quaternary ammonium surfactant（CTAB） as co-templates.The mesoporous silica shell with large surface area（188 m^2/g） has mesochannels parallel to the spherical surface.Furthermore,the hydrothermal treatment（～130 ℃） was introduced to enlarge the pore size（～7.3 nm） and pore volume（0.23 cm^3/g）.