Monolithic periodic mesoporous silica with well-defined macropores
Monolithic periodic mesoporous silica with well-defined macropores
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DOI：
10.1021/cm048091c
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发表时间：
2005-04-19
影响因子：
8.6
通讯作者：
Kodaira, T
中科院分区：
文献类型：
--
作者：
Amatani, T;Nakanishi, K;Kodaira, T
以硅醇盐为原料，采用结构导向剂和胶束溶胀剂，通过自发溶胶-凝胶法合成了具有分级大孔-介孔结构的整体式纯硅胶。具有明确的共连续大孔的整体式主体是由聚合反应引起的并行相分离和溶胶-凝胶转变的结果，而介孔是由无机物质、结构导向剂和胶束溶胀剂的协同自组装形成的。这些双峰孔系统是在恒温封闭条件下自发形成的。通过热处理除去表面活性剂，得到具有微米和纳米离散尺寸范围内的分级和完全可接近的孔的硅胶。通过X射线衍射和场发射扫描电子显微镜观察证实了介孔的二维六方有序排列。此外，通过进一步添加的胶束溶胀剂，介观结构的过渡，从有序的2D-六边形阵列的介观结构的多孔泡沫（MCF）已诱导伴随着微小的修改微米范围内的结构。
Monolithic pure silica gels with hierarchical macro-mesoporous structure have been synthesized via a spontaneous sol-gel process from silicon alkoxide using a structure-directing agent and a micelle-swelling agent. A monolithic body with well-defined co-continuous macropores is a result of concurrent phase separation and sol-gel transition induced by the polymerization reaction, whereas the mesopores are templated by the cooperative self-assembly of inorganic species, a structure-directing agent, and a micelle-swelling agent. These bimodal pore systems are formed spontaneously in a closed condition at a constant temperature. The following removal of surfactants by heat-treatment gives silica gels with hierarchical and fully accessible pores in discrete size ranges of micrometers and nanometers. The highly ordered 2D-hexagonal arrays of mesopores have been confirmed by X-ray diffraction measurements and FE-SEM observations. Furthermore, by further additions of the micelle-swelling agent, the mesostructural transition from well-ordered 2D-hexagonal arrays to mesostructured cellular foams (MCF) has been induced accompanied by minor modifications of the micrometer-range structure.