Center for Engineered Polymeric Materials, Department of Chemistry, College of Staten Island and Graduate Center, City University of New York, 2800 Victory Boulevard, Staten Island, NY 10314, USA.
J Colloid Interface Sci. 2011 Sep 15;361(2):472-6. doi: 10.1016/j.jcis.2011.05.076. Epub 2011 Jun 6.
Highly ordered mesoporous SBA-15 silica with large pore diameter of 18 nm (nominal BJH pore diameter 22 nm) and short pore length (500 nm) was synthesized using a micelle expander 1,3,5-triisopropylbenzene in the absence of ammonium fluoride by employing short initial stirring time at 17 °C followed by static aging at low temperature. Scanning and transmission electron microscopies revealed that the material comprised of platelet particles in which large mesopores were nearly flawlessly arranged within uniform domains up to 3 μm in size. The platelet SBA-15 had the (100) interplanar spacing of 17 nm, high surface area (470 m(2) g(-1)) and large pore volume (1.6 cm(3) g(-1)). The hydrothermal treatment at 130 °C for 2 days was employed to eliminate constrictions from the pore channels. The control experiment showed that a sample prepared with prolonged stirring had very similar mesoporous properties, but the particle size was smaller and the domains were irregular, proving that the static conditions facilitate the formation of SBA-15 with platelet particle morphology. The absence of ammonium fluoride was also critical in attaining the platelet particle shape.
具有 18nm 大孔径（BJH 孔径约 22nm）和短孔长（500nm）的高度有序介孔 SBA-15 硅材料，是在无氟化铵条件下，通过在 17°C 下采用短初始搅拌时间，并在低温下进行静态陈化，使用胶束扩孔剂 1,3,5-三异丙基苯合成的。扫描和透射电子显微镜显示，该材料由板状颗粒组成，其中大的介孔在大小可达 3μm 的均匀畴内几乎无缺陷排列。板状 SBA-15 的（100）面间距为 17nm，具有高的比表面积（470m2g-1）和大的孔体积（~1.6cm3g-1）。采用 130°C 水热处理 2 天以消除孔道中的缩颈。对照实验表明，采用延长搅拌时间制备的样品具有非常相似的介孔性能，但颗粒尺寸较小，畴不规则，证明静态条件有利于形成具有板状颗粒形态的 SBA-15。无氟化铵对于获得板状颗粒形状也是至关重要的。
