介孔氧化硅膜在多孔陶瓷载体上的组装

Assembly of Mesoporous Silica Membrane on Porous Ceramic Substrate

采用过滤成膜方式结合溶剂挥发诱导自组装方法在多孔氧化铝中空纤维上制备了介孔氧化硅膜。XRD、TEM和N2吸附脱附实验结果显示非担载膜具有有序的六方介孔结构。通过对中空纤维担载膜的XRD分析进一步确认介孔氧化硅膜的形成。SEM和EDS线扫描结果显示制备的担载膜表面完整、无缺陷,膜层和载体界面之间结合紧密。在此基础上对介孔膜在多孔陶瓷载体上的形成机理进行了探讨。

The preparation of mesoporous silica membranes on α-Al2O3 hollow fibers was studied by filtration technique combined with evaporation induced self-assembly （EISA） process. X-ray diffraction （XRD）, Transmission electron microscopy （TEM） and N2 adsorption desorption investigations reveal that these unsupported membranes possess ordered hexagonal mesostructure. Direct XRD analysis on supported membranes further confirms the formation of continuous mesoporous silica layer on the outer side of α-alumina hollow fibers. Scanning electron mieroseopy（SEM） studies and energy-dispersive spectroscopy（EDS） line scanning results show that the surface of supported membrane is defect-free and the good adherence between membrane and support. The formation mechanism of ordered mesoporous membrane on porous ceramic substrate is also discussed.