MCM-41 silica monoliths with independent control of meso- and macroporosity
MCM-41 silica monoliths with independent control of meso- and macroporosity
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DOI：
10.1039/b711544j
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发表时间：
2007-10
影响因子：
3.3
通讯作者：
Jérôme Babin;Julien Iapichella;B. Lefèvre;C. Biolley;J. Bellat;F. Fajula;A. Galarneau
中科院分区：
文献类型：
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作者：
Jérôme Babin;Julien Iapichella;B. Lefèvre;C. Biolley;J. Bellat;F. Fajula;A. Galarneau
由MCM-41组成的厘米大小的大孔二氧化硅整料已经通过允许独立控制介孔和大孔孔隙率的两步程序制备。在第一步中，在酸性介质中通过相分离（称为Spinodal分解）制备具有2至20 μ m的大孔隙度的整体料，导致二氧化硅/聚合物相和水相的双连续结构。然后，在保持材料原始形态和大孔隙率的条件下，使整料在十六烷基三甲基铵的碱性溶液中反应，将二氧化硅骨架转化为MCM-41。旋节线分解和赝晶变换的结合被证明是非常有效的，以精确地调整宏观物体的纹理特征。
Centimetre sized macroporous silica monoliths consisting of MCM-41 have been prepared by a two-step procedure allowing an independent control of the meso- and macro-porosity. In the first step a monolith with a macroporosity tailored between 2 and 20 μm is prepared under acidic medium by a phase separation, named spinodal decomposition, leading to a bicontinuous structure of a silica/polymer phase and a water phase. The monolith is then reacted in an alkaline solution of cetyltrimethyl ammonium to transform the silica skeleton into MCM-41 under conditions which preserve the original morphology and macroporosity of the material. The combination of spinodal decomposition and pseudomorphic transformation proves very efficient to precisely tune the textural characteristics of macroscopic objects.