Controlling the primary particle evolution process towards silica monoliths with tunable hierarchical structure.
Controlling the primary particle evolution process towards silica monoliths with tunable hierarchical structure.
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DOI：
10.1016/j.jcis.2011.08.061
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发表时间：
2011-12
影响因子：
9.9
通讯作者：
Yu Zhou;W. Lin;Jing Yang;Ling Gao;Nathan J Lin;Jia Yuan Yang;Q. Hou;Ying Wang;J. Zhu
中科院分区：
文献类型：
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作者：
Yu Zhou;W. Lin;Jing Yang;Ling Gao;Nathan J Lin;Jia Yuan Yang;Q. Hou;Ying Wang;J. Zhu
为了在介孔二氧化硅上建立多层次的层次结构，本文报道了一种制备具有纳米级孔隙结构、微米级微观形态和毫米级以上宏观形态的整体结构的新策略。以三嵌段共聚物P123、羟基羧酸和正硅酸四甲基（TMOS）为原料，在弱酸性条件下合成了这些分层整体结构，无需添加任何添加剂，只需控制合成条件即可轻松调节介观结构的织构性能。在合成过程中，初级颗粒可以选择性地合成成单分散的球形、面条状、棱柱状、不同尺寸的直棒状或不规则条状，并且它们在三维方向上的连接和排列也可以调节。因此，可以改变介孔的各种结构性质，包括孔径（5.5-10.6nm）、总孔容（0.48 - 1.2cm3 - 1）、微孔表面积（47-334m2g - 1）和孔形状（从2D或3D直通道到堵塞通道）。此外，这些巨石表现出相当大的机械强度；它们还用于消除烟草烟雾中的颗粒物和烟草特殊亚硝胺（TSNA），表现出各种形态辅助功能。
In order to establish the hierarchical structure in multiple levels on mesoporous silica, this article reports a new strategy to prepare the monolith with the pore configuration in nanometer scale, micro-morphology in micrometer level and macroscopic shape in millimeter or larger grade. These hierarchical monoliths are synthesized in a weak acidic condition by using triblock copolymer P123, hydroxyl carboxylic acid and tetramethyl orthosilicate (TMOS), and the textural properties of the mesostructure can be facilely adjusted by simply controlling the synthesis condition without any additive. During the synthesis, the primary particles can be selectively synthesized as monodispersed sphere, noodle, prism, straight rods with different size or irregular bars, and their connection plus arrangement in 3D directions can be also regulated. Therefore, various textural properties of mesopore are able to be altered including pore size (5.5–10.6nm), total pore volume (0.48–1.2cm3g−1), micropore surface area (47–334m2g−1), and pore shape (from 2D or 3D straight channel to plugged channel). Moreover, these monoliths exhibit a considerable mechanical strength; they are also applied in eliminating particulate matters and tobacco special nitrosamines (TSNA) in tobacco smoke, exhibiting various morphology-assisted functions.