中空介孔二氧化硅微球的制备及表征分析

以二氯化-N,N'-二(3-氢化松香酰氧-2-羟丙基)四甲基乙二胺(DHRT)为模板剂,正硅酸乙酯为硅源,采用溶胶-凝胶和水热合成的方法,分别制备了中空介孔二氧化硅微球SiO2-1和SiO2-2.利用SEM、TEM、FT-IR、XRD和氮气吸附-脱附对SiO2-1和SiO2-2进行表征分析,结果表明:两种方法均已成功制...

Preparation and Characterization of Hollow Mesoporous Silica Microspheres

Hollow mesoporous silica microspheres SiO₂-1 and SiO₂-2 were prepared by sol-gel and hydrothermal synthesis using dichloride-N,N′-bis(3-hydrorosin loxy-2-hydroxypropyl)tetramethylenediamine(DHRT)as template agent and ethyl orthosilicate as silicon source.SEM,TEM,FT-IR,XRD and nitrogen adsorption-desorption were used to characterize SiO₂-1 and SiO₂-2.The results showed that silicon dioxide microspheres with amorphous structure were successfully prepared by both methods;the agglomeration phenomenon between silica particles gradually disappeared with the increase of the amount of template agent(0.1-1 g);SiO₂-1 was mainly loose microsphere with patterns,and SiO₂-2 was hollow microsphere with the wall thickness of 80-85 nm.The average particle size distributions of SiO₂-1 and SiO₂-2 prepared with different template dosages(0.3-1 g)were 0.22-0.33μm and 0.34-0.41μm,respectively.The morphology and particle size of SiO₂-1-0.7 and SiO₂-2-0.7 prepared by two methods exhibited good morphology and low particle size,with specific surface area of 561.52 and 463.41 m²/g,cumulative pore volume of 0.35 and 0.42 m³/g,and average pore size of 2.56 and 3.66 nm,respectively.Zeta potential analysis showed that the formation of SiO₂ hollow mesoporous structure was mainly caused by the cooperative self-assembly process between the oligomer obtained by hydrolyzing polycondensation of ethyl orthosilicate and the template agent.