以正硅酸四乙酯(TEOS)为原料采用STObEr法制备了单分散、粒径分布均匀、平均直径范围在250~800nM的纳米二氧化硅微球.通过SEM和Xrd表征手段,探讨了水、TEOS和氨水用量对SIO2形貌和粒径的影响.结果表明,添加适量的水会得到粒径较大、均匀且分散性好的SIO2微球;随氨水和TEOS用量增多,SIO2粒径增加;若氨水用量太少,则得到粒径虽小但圆度差、表面不光滑的SIO2.Monodisperse nano-silica microspheres were prepared by conventional Stober method.Silica particles with sizes between 100 to 800 nm were obtained by alkaline hydrolysis of tetraethyl orthosilicate(TEOS) in ethanol solution.The morphology and particle size of nano-silica were investigated using SEM and XRD.The results showed that monodisperse silica particles could be obtained using proper amount of water.The results also showed that the silica particle sizes decreased with increasing amount of ammonia and TEOS,while silica particles obtained using low concentraton of ammonia appeared rough surface.国家重点基础研究发展规划(973)项目(2011CBA00508
