Influence of the kind of layered disodium disilicates on the formation of silica-organic mesostructured materials
Influence of the kind of layered disodium disilicates on the formation of silica-organic mesostructured materials
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DOI：
10.1021/cm030583m
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发表时间：
2004-08-24
影响因子：
8.6
通讯作者：
Kuroda, K
中科院分区：
文献类型：
--
作者：
Kato, M;Shigeno, T;Kuroda, K
用水合二硅酸钠和氯化十六烷基三甲基铵（C(16)TMA）在不同的C(16)TMA/Si摩尔比下形成硅基介结构材料，并与卡奈米石的介结构材料进行比较。当C(16)TMA/Si比分别为0.2、0.5、0.7和1.0时，水合-二硅酸钠在煅烧过程中坍塌形成二维六角形结构。当C16TMA/Si比超过1.0时，形成了有序度较低且单向排列的直线型六边形结构。在卡奈米石与C(16)TMA离子反应的情况下，当其与C(16)TMA离子的比例大于0.5时，形成片层状介观结构，而当其与C(16)TMA离子的比例为0.2时，形成二维六边形结构。当C(16)TMA/Si比为2.0时，在较低pH下制备了水合-二硅酸钠衍生的介孔二氧化硅（SSW-1）。由于水合二硅酸钠独特的层状硅酸盐结构，水合二硅酸钠弯曲方向的Si-O-位点之间的距离比卡麻石长，因此水合二硅酸钠中C(16)TMA离子头基所占体积应该比卡麻石中大。
Silica-based mesostructured materials are formed using hydrated alpha-sodium disilicate and hexadecyltrimethylammonium (C(16)TMA) chloride at various C(16)TMA/Si molar ratios, and compared with those from kanemite. When the C(16)TMA/Si ratios are 0.2, 0.5, 0.7, and 1.0, 2-D hexagonal structures are formed from hydrated alpha-sodium disilicate though the structures are collapsed on calcination. Less ordered hexagonal structures with straight channels arranged in one direction are formed when the C16TMA/Si ratio exceeds 1.0. In the case of the reactions of kanemite with C(16)TMA ions, lamellar mesostructures are formed at the ratios higher than 0.5, whereas a 2-D hexagonal structure is formed only at the ratio of 0.2. Mesoporous silica (SSW-1) derived from hydrated alpha-sodium disilicate is prepared at lower pH without acid treatment when the C(16)TMA/Si ratio is 2.0. The volume occupied by the headgroups Of C(16)TMA ions in hydrated a-sodium disilicate should be larger than that in kanemite because the distance between Si-O- sites in the bending direction of hydrated a-sodium disilicate is longer than that of kanemite due to the unique layered silicate structure.