Formation of Cubic Ia3d Silicas and Metal Oxide-Loaded Silicas Using a Triblock Copolymer (EO20PO70EO20)−Acetate Mixture as Structure Director in Aqueous Solution
Formation of Cubic Ia3d Silicas and Metal Oxide-Loaded Silicas Using a Triblock Copolymer (EO20PO70EO20)−Acetate Mixture as Structure Director in Aqueous Solution
复制标题
DOI：
10.1021/cm0623615
复制
发表时间：
2007-02
影响因子：
8.6
通讯作者：
Z. Wu;Y. Wang;Wanjing Huang;Jing Yang;Hong Ji Wang;J. Xu;and Yi Lun Wei;J. Zhu
中科院分区：
文献类型：
--
作者：
Z. Wu;Y. Wang;Wanjing Huang;Jing Yang;Hong Ji Wang;J. Xu;and Yi Lun Wei;J. Zhu
利用三嵌段共聚物（EO 20 PO 70 EO 20）-乙酸酯混合物在水溶液中在宽的pH范围内，甚至在二氧化硅的等电点以上，成功地制备了具有Ia 3d结构的介孔二氧化硅，其中pH值可以通过改变HCl和/或乙酸酯的浓度来微调。通过XRD、TEM和N2吸附测量表征表明，立方Ia 3d材料具有高的比表面积（约900 m2/g）、大的孔体积（约1.2 cm 3/g）和均匀的孔径（约9.2 nm）。进一步绘制了SiO2-P123-ZnAc 2-H2O-HCl体系的相图，绘制了立方相的范围。研究了相变过程中的盐效应，发现阳离子的性质和浓度也能决定介观结构。此外，当同时引入两种不同的乙酸盐时，可以直接合成金属氧化物修饰的立方介孔二氧化硅。其中，铜...
Mesoporous silica with Ia3d structure has been successfully prepared utilizing a triblock copolymer (EO20PO70EO20)−acetate mixture for structure direction in aqueous solution over a wide pH range, even above the isoelectric point of silica, where the pH value could be finely tuned by varying the concentration of HCl and/or acetate. Characterization by XRD, TEM, and N2 sorption measurements show that the cubic Ia3d materials possess high surface areas (about 900 m2/g), large pore volumes (about 1.2 cm3/g), and uniform pore diameters (about 9.2 nm). Further, the phase diagram in the SiO2−P123−ZnAc2−H2O−HCl system is drawn to map the range of cubic mesophase. Salt effect has been investigated during the phase transformation process, which reveals that the nature and concentration of cations can also determine the mesostructure. In addition, when two different acetates are introduced into the solution at one time, metal oxides-modified cubic mesoporous silica can be directly synthesized. Among others, copper-...