以多孔阳极氧化铝膜为模版, 采用溶胶-胶方法, 制备了具有介孔结构的二氧化硅纳米纤维. 利用SEM、XRD、N2吸附-脱附和TEM等手段对样品进行了表征. 实验结果显示SiO2纤维的直径和长度分别依赖于所使用的模板(阳极氧化铝膜)的孔直径和膜的厚度. 而介孔SiO2纤维中纳米孔道的取向可以通过改变陈化环境来控制. 在有水存在的环境下, SiO2纤维其纳米孔道取向是环绕于纤维轴向的; 而在无水存在的环境下, SiO2纤维其纳米孔道取向则是平行于纤维的轴向的.
Mesoporous silica fibers were prepared within porous anodic aluminum oxide membrane (AAO) using a simple Sol-Gel method. The sample was characterized by SEM, XRD, nitrogen adsorption-desorption and TEM. The diameter and the length of the mesoporous silica fibers are depend on the pore diameter and thickness of AAO membrane, respectively. The orientation of the nanochannels in mesoporous silica fibers can be readily controlled by changing the aging environment. For the samples aged with the presence of water, all the nanochannels in the silica fibers are found to be circular around the fibers. However, for the samples aged without water, the nanochannels were found to be parallel along the fiber axes.
参考文献
| [1] | Alberius P C A, Frindell K L, Hayward R C, et al. General predictive synthesis of cubic, hexagonal, and lamellar silica and tiatania mesostructured thin films. Chem. Mater., 2002, 14(8): 3284-3294. |
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