特定酸度条件下的有序介孔SiO_2的制备与表征

Preparation and Characterization of Ordered Mesoporous SiO_2 Under Certain Acidity

采用水解缩合法在不同酸度条件下制备了介孔SiO2材料,研究了特定酸度条件下有序介孔SiO2的制备条件及不同酸度对有序介孔SiO2孔径大小的影响,并通过小角X-射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)、透射电镜(TEM)和扫描电镜手段对制备的样品进行了表征.结果表明,控制酸度范围可以得到所需孔结构的有序介孔SiO2纳米材料,最佳酸度条件为1~2 mol/L,0.01 mol/L^0.5 mol/L时,介孔有序度降低,孔径变大,小于0.001 mol/L时,SiO2介孔消失.

With hydrolytic-condensation,mesoporous SiO2 materials were prepared in different acidities.This article includes the preparation condition of ordered mesoporous silicates under certain acidity and the influence of acidity to the core size of mesoporous SiO2.The samples are characterized by low angle X-ray diffraction （XRD）,Fouriertransform infrared （FT-IR）,transmission electron microscopy （TEM） and scanning electron microscopy （SEM）.Results show that ordered mesoporous silicates of expected pore sizes can be obtianed by controling the acidity range.And the best acidity is 1-2 mol/L.While the acidity condensation ranges from 0.O1 to 0.5 mol/L,mesoporous silicates become less ordered and larger core sized.When below 0.001 mol/L,mesoporous silicates disappear.