以TEOS(正硅酸乙酯)为前驱体、氨水为催化剂和无水乙醇为溶剂,采用溶胶-凝胶法制备了纳米二氧化硅。利用傅里叶变换红外光谱(FT-IR)仪和纳米激光粒度分布仪对纳米二氧化硅的结构、粒径及其分布进行了表征,并着重探讨了反应温度、催化剂浓度和反应时间等对纳米二氧化硅粒径的影响。研究结果表明:当反应温度为60℃、催化剂浓度为0.82 mol/L和反应时间为3~4 h时,制得的纳米二氧化硅平均粒径为300 nm左右。 Nanosilica was prepared by sol-gel method using TEOS (tetraethyl orthosilicate) as precursor, ammonia as catalyst and anhydrous ethanol as solvent. The structure, particle size and distribution of nano-silica were characterized by Fourier transform infrared spectroscopy (FT-IR) and nano-laser particle size distribution analyzer. The effects of reaction temperature, catalyst concentration and reaction time on the Effect of nano-silica particle size. The results show that when the reaction temperature is 60 ℃, the catalyst concentration is 0.82 mol / L and the reaction time is 3 ~ 4 h, the average particle size of the prepared nanosilica is about 300 nm.