【摘要】 以工业硅溶胶为硅源,采用溶胶一凝胶技术和滴液成球法制备了多孔SiO₂/壳聚糖复合小球,研究了N,N-二甲基甲酰胺的引入对复合小球性质的影响。利用FTIR、SEM和BET吸附对小球的微观结构、形貌和性质进行了研究。结果表明,多孔SiO₂/壳聚糖复合小球是直径为1.93～2.61m、密度为0.435～0.447g/cm³的轻质多孔球体,其比表面积为134.11～174.53 m²/g,孔径分布在5～55nm。引入N,N-二甲基甲酰胺后,小球的孔径减小,比表面积增大。更多还原

【Abstract】 Using industrial silica sols as raw material,porous SiO₂/chitosan composite spherules are prepared by a spherule-dropping technology during sol-gel process.The effect of N,N-dimethylformamide on perpoties of spher- ules is studied.The microstructure,morphology and properties of the spherules are characterized by FTIR,SEM and BET measurements.The results indicate that SiO₂/chitosan composite spherules are light weight balls,with the diame- ter of 1.93～2.61mm and the density of 0.435～0.447g/cm³.The pore diameter of the spherules is in the range of 5～55nm,and the specific surface area is about 134.11～174.53m²/g.The pore size of spherules decreases as N,N-dime- thylformamide is added,but the surface area increases.更多还原