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由于介孔二氧化硅单晶规整的外观形貌和有序的内部孔道结构性能,使其在微激光器件领域具有十分重要的潜在应用.试着用高电荷密度的阳离子三头季铵盐表面活性剂(C18-2-3-1)作模板剂,用正硅酸四乙酯作无机前驱体,在硫酸介质中通过调变有机-无机物种之间的协同组装作用,成功地合成了具有简单立方相Pm3n结构的介孔二氧化硅单晶.扫描电子显微镜(SEM)观察到这种介孔二氧化硅单晶具有菱形十二面体形貌,X射线衍射(XRD)和透射电子显微镜(TEM)测试结果证实这种介孔单晶属于简单立方Pm3n对称结构.氮气吸附数据测得这种单晶具有较大的BET比表面积(550cm2/g),较大的孔体积(BJH0.20cm3/g)和孔径(BJH2.4nm).
Due to the regular appearance and orderly internal pore structure of mesoporous silica, it possesses a very important potential application in the field of micro-laser devices.We try to use the high charge density cationic three-terminal quaternary ammonium salt surfactant (C18-2-3-1) as templating agent and tetraethyl orthosilicate as an inorganic precursor, the synergistic assembly between organic and inorganic species in sulfuric acid medium was successfully synthesized. Mesoporous Pm3n structure of the mesoporous silica single crystal scanning electron microscopy (SEM) observed this mesoporous silica single crystal has a diamond dodecahedral morphology, X-ray diffraction (XRD) and transmission electron microscopy (TEM The test results confirm that this mesoporous single crystal belongs to the simple cubic Pm3n symmetry structure.The nitrogen adsorption data show that this single crystal has a larger BET specific surface area (550cm2 / g), a larger pore volume (BJH0.20cm3 / g ) And pore size (BJH 2.4 nm).