Effect of polymer-to-silica ratio on the formation of large three-dimensional cage-like mesostructures
Effect of polymer-to-silica ratio on the formation of large three-dimensional cage-like mesostructures
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DOI：
10.1039/b603436e
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发表时间：
2006-01-01
影响因子：
3.3
通讯作者：
Jaroniec, Mietek
中科院分区：
文献类型：
--
作者：
Grudzien, Rafal M.;Grabicka, Bogna E.;Jaroniec, Mietek
这项工作显示了聚合物与二氧化硅的比例对具有三维面心立方对称的笼状有序介孔二氧化硅FDU1形成的影响。以正硅酸四乙酯（TEOS）为原料，在聚（环氧乙烷）-聚（环氧丁烯）-聚（环氧乙烷）（EO39BO47EO39）三嵌段共聚物存在下，在酸性条件下合成了FDU1样品。反应混合物中三嵌段共聚物与TEOS的摩尔比为0.0037 ~ 0.0148。小角x射线散射、氩气吸附-解吸和高分辨率热重研究表明，最佳EO39BO47EO39/TEOS比值约为0.0074，可获得笼形开口均匀、孔径分布窄、比表面积高的优质FDU1材料。低于和高于上述值的FDU1二氧化硅具有不均匀的笼状入口，更宽的孔径分布，更低的BET比表面积和更小的介孔直径。
This work shows the influence of polymer-to-silica ratio on the formation of cage-like ordered mesoporous silica, FDU1, having a three-dimensional face-centered cubic symmetry. The FDU1 samples studied were synthesized from tetraethyl orthosilicate (TEOS) under acidic conditions in the presence of poly(ethylene oxide)-poly(butylene oxide)-poly(ethylene oxide) (EO39BO47EO39) triblock copolymer. The molar ratio of triblock copolymer to TEOS in the reaction mixture was varied from 0.0037 to 0.0148. Small angle X-ray scattering, argon adsorption-desorption and high resolution thermogravimetry studies indicate that an optimal EO39BO47EO39/TEOS ratio, which led to a high-quality FDU1 material with uniform cage openings, narrow pore size distribution and high specific surface area, was about 0.0074. The FDU1 silicas obtained for lower and higher ratios than the aforementioned value possessed non-uniform cage entrances, broader pore size distributions, lower BET specific surface areas and smaller mesopore diameters.