Periodic Mesoporous Organosilicas with Phenylene Bridging Groups, 1,4-(CH2)nC6H4 (n = 0−2)
Periodic Mesoporous Organosilicas with Phenylene Bridging Groups, 1,4-(CH2)nC6H4 (n = 0−2)
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DOI：
10.1021/cm048986p
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发表时间：
2004-11
影响因子：
8.6
通讯作者：
William J. Hunks and;G. Ozin
中科院分区：
文献类型：
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作者：
William J. Hunks and;G. Ozin
以亚甲基间隔物[1,4-(CH2)nC6H4 (n = 0−2)]与聚氧乙烯（10）十六烷基醚（Brij 56）低聚物为结构导向物质，在酸催化下，通过苯基桥联硅氧烷前体与聚氧乙烯（10）十六烷基醚（Brij 56）低聚物聚合制备了周期介孔有机硅（PMOs）。采用酸化乙醇萃取法从纳米多孔无机-有机杂化物中去除表面活性剂模板。通过粉末x射线衍射、氮气吸附、13C和29Si固体核磁共振、扫描电镜和透射电镜以及热重分析对介孔有机硅进行了表征。有机硅材料形成了均匀的二维六边形介孔阵列，孔径范围为2 ~ 3nm，相应的表面积为750 ~ 1200 m2g-1。在苯基桥上添加两个亚甲基导致孔径、表面积和孔体积的显著减小。材料的热稳定性随时间的变化而下降。
Periodic mesoporous organosilicas (PMOs) were prepared by polymerizing phenylene-bridged silsesquioxane precursors containing an incremental increase in methylene spacers [1,4-(CH2)nC6H4 (n = 0−2)] in combination with polyoxyethylene(10) cetyl ether (Brij 56) oligomers as structure-directing species under acid catalysis. Surfactant templates were removed from the nanoporous inorganic−organic hybrids using acidified ethanol extractions. Mesoporous organosilicas were characterized by powder X-ray diffraction, nitrogen gas sorption, 13C and 29Si solid-state NMR, scanning and transmission electron microscopy, and thermogravimetric analysis. Organosilica materials formed uniform arrays of 2D-hexagonal mesopores with pore diameters ranging from 2 to 3 nm and corresponding surface areas of 750−1200 m2g-1. Addition of two methylene groups to the phenylene bridge resulted in a substantial decrease in the pore size, surface area, and pore volume. The thermal stability of the materials decreases in the following ord...