纳米SiO2的分散研究

 分析了纳米SiO2的特殊结构和性能,介绍了纳米SiO2的分散方法与分散仪器。通过实验选用了合适的分散剂,利用超声波振动对纳米SiO2进行分散,制备纳米SiO2悬浮液。采用烘箱法和粒度分析法,对含有不同质量分数分散剂的纳米SiO2悬浮液进行分散效果分析,探索适用于纳米SiO2的分散条件。提出了用分散效率以及分散后悬浮液中纳米颗粒的粒径变化来表征纳米SiO2在水中的分散效果。最终确定对纳米SiO2具有较好分散效果的方法是用超声波清洗器作为分散仪器,添加适量的六偏磷酸纳作为分散剂。

Research on the dispersing method of nanometer SiO2

The unique structure of nanometer SiO2, its property, dispersing method and the instruments employed were discussed. The nanometer suspension was prepared through ultrasonic vibrating and addition of selected dispersants. Oven and nanometer diameter methods were adopted to analyze the dispersing result of the nanometer suspension which contained different mass fractions of dispersion agent to investigate proper dispersion conditions for it. It was suggested that the dispersing effect of nanometer SiO2 in water be characterized by the dispersing efficiency and the change of size of nanometer particles in the dispersed suspension. It is found that the integrated physico-chemical dispersing method is a better one for nanometer SiO2 in which an ultrasonic cleaner is used as dispersing instrument and appropriate dosage of sodium hexametaphosphate as dispersant.