以水合氯化铁和正硅酸乙酯为前驱物, 通过溶胶--凝胶法制备不同SiO2含量的氧化铁基Fe2O3--SiO2二元复合凝胶, 利用冷冻干燥法对凝胶进行干燥得到复合干凝胶。分别采用BET、IR和SEM对复合凝胶的比表面积、孔结构、红外吸收峰和表面形貌进行分析。结果表明, 复合凝胶的比表面积和孔体积随着SiO2含量的增加而增加, 同时SiO2的引入改变了Fe2O3凝胶的骨架结构, 使得Fe2O3凝胶中部分Fe--O--Fe键与Si原子形成一定数量的Fe--O--Si键, 形成了以Fe2O3为主要基体的Fe2O3-SiO2复合凝胶。SiO2的引入有效提高了复合凝胶的比表面积, 改善了凝胶的孔结构, 为制备二元复合凝胶为骨架的高能纳米铝热剂奠定基础。
The iron oxide–based Fe2O3–SiO2 binary composite xerogels were prepared by sol-gel and freeze-drying method using FeCl3·6H2O and TEOS as precursors. The pore structure and specific surface area of the binary xerogels were investigated by means of nitrogen adsorption experiments, FT–IR spectroscopy and SEM. The results show that the specific surface area and the pore volume increase with the silica content, which is caused by Fe–O–Si bonds formed in the binary xerogels. The addition of SiO2 improves the specific area and pore structure of the binary composite xerogels. These will provide a basis for their application in the nano–thermite.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] | |
| [18] | |
| [19] | |
| [20] | |
| [21] | |
| [22] | |
| [23] | Arihiro Kanazawa, Kotaro Satoh, Masami Kamigaito, Iron oxides as heterogeneous catalysts for controlled/living radical polymerization of styrene and methyl methacrylate, Macromolecules, 44(7), 1927(2011)2 Benoit P. Pichon, Pierric Louet, Olivier Felix, Marc Drillon, Sylvie Begin-Colin, Gero Decher, Magnetotunable hybrid films of stratified iron oxide nanoparticles assembled by the layer-by-layer technique, Chemistry of Materials, 23(16), 3668(2011)3 MA Zhenye, LI Fengsheng, Research on preparation of &alpha |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%