Synthesis of oriented films of mesoporous silica on mica
Synthesis of oriented films of mesoporous silica on mica
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DOI：
10.1038/379703a0
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发表时间：
1996-02
期刊：
影响因子：
64.8
通讯作者：
Hong Yang;A. Kuperman;N. Coombs;Suzan Mamiche-Afara;G. Ozin
中科院分区：
文献类型：
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作者：
Hong Yang;A. Kuperman;N. Coombs;Suzan Mamiche-Afara;G. Ozin
多孔无机固体在催化和分离技术等领域有着广泛的应用。此类材料最有前途的途径之一是利用超分子有机模板和无机前体分子之间的协同相互作用来创建有序的多孔固体1-7。这种通用方法提供了相当大的灵活性，并导致材料具有广泛的体积形态和跨越几个数量级的受控孔径8-10。从技术角度来看，以介孔薄膜的形式制备此类材料是可取的，但实现这一目标的尝试基本上不成功，导致材料无序11。在这里，我们报告了在新劈裂的云母基底上合成薄（∼0.2–1.0μm）介孔二氧化硅有序薄膜。从基材上去除后，薄膜是稳定的。我们提出了一个模型来解释这些薄膜的形成，其中云母基材的表面结构和反应性控制胶束前体物质的方向，这反过来又对所得固体薄膜施加了秩序。
POROUS inorganic solids find wide application in, for example, catalysis and separation technologies. One of the most promising routes to such materials exploits cooperative interactions between a supramolecular organic template and inorganic precursor molecules to create an ordered porous solid1–7. This general approach offers considerable flexibility, and has led to materials with a wide range of bulk morphologies and controlled pore diameters spanning several orders of magnitude8–10. From a technological point of view, the preparation of such materials in the form of mesoporous thin films is desirable, but attempts to achieve this aim have been largely unsuccessful, resulting in disordered materials11. Here we report the synthesis of thin (∼0.2–1.0μm) ordered films of mesoporous silica on freshly cleaved mica substrates. The films are stable on removal from the substrate. We propose a model to explain the formation of these films, in which the surface structure and reactivity of the mica substrate controls the orientation of the micellar precursor species, which in turn imposes order on the resulting solid film.