T型微通道和一锅混合法制备纳米二氧化硅影响因素研究

Influencing factors of preparation for nano-silicon dioxide based on T-type microchannel and one-pot mixed technique

利用T型微通道法和一锅混合微乳液法可控制备了纳米二氧化硅。研究了环己烷、正丁醇、表面活性剂(OP-10)、氨水和正硅酸乙酯(TEOS)用量对T型微通道法和一锅混合法制备纳米二氧化硅的影响。同时对两种方法制备的纳米二氧化硅的粒径及比表面积进行了对比,分析和探讨了两种方法的优缺点。研究结果表明:上述因素均可调节纳米二氧化硅的粒径和比表面积,二氧化硅的粒径均随其用量的增加先减小后增大,比表面积则与其相反。另外,T型微通道法较一锅混合法通过控制进样速度使得调控更为精确,制备的纳米二氧化硅粒径更小、分布更窄,平均粒径为66～300 nm,比表面积为16～90 m2/g。

T-type microchannel and one pot mixed microemulsion means were used to prepare nano silicon dioxide(SiO2)under controllable conditions.The influences of the dosages of cyclohexane,n-butanol,surfactant(OP-10),ammonia and TEOS on preparation of nano-SiO2with the above two methods were investigated.Meanwhile,the particle size and surface area of SiO2were compared based on the two methods were compared and analyzed.The advantages and disadvantages of T-type microchannel and one pot mixed microemulsion means were also analyzed and discussed.The results showed that the above factors all could adjust the particle size and specific surface area of nano silicon dioxide.The particle size decreased,and then increased with the increasing of their dosages,while the specific surface area had the opposite result.In addition,the T-type microchannel method was more precise than the one pot mixing method by controlling the injection speed,and the prepared nano silicon dioxide had a smaller particle size and a narrower range.The average particle size was66~300nm and the specific surface was within the range of16~90m^2/g.