双膜分散法制备超细氧化锌颗粒

Preparation of zinc oxide ultrafine particles using double hollow fiber membrane dispersion technology

以氯化锌和氢氧化钠为反应物,中空纤维膜为分散介质,采用双膜分散法制备氧化锌颗粒。研究了两膜组件间距、分散相流速及表面活性剂对颗粒尺寸和形貌的影响。所得产物的SEM和粒度分布分析结果表明:两膜组件间距对颗粒平均尺寸无明显影响;无表面活性剂时,颗粒尺寸随着分散相流速的增大而增大,当流速从10 mL/min增大到40 mL/min时,平均粒径从307 nm增大到476 nm;表面活性剂的加入能有效抑制颗粒的生长,且颗粒尺寸随着分散相流速的增大而减小,当分散相流速由20 mL/min增至70 mL/min时,颗粒平均粒径由182 nm减小到45 nm。

Ultrafine zinc oxide particles have been obtained from a solution reaction between ZnCl2 and NaOH using a double hollow fiber membrane as the dispersion medium.The effects of different factors such as mixing distance,flow rate and surfactant were investigated in detail.The results showed that the mixing distance had no significant effect on the mean particle diameter.When there was no surfactant,the mean particle diameter of zinc oxide increased from 307 nm to 476 nm on increasing the flow rate from 10 mL/min to 40 mL/min.With added surfactant,the growth of particles was effectively suppressed,and the mean particle diameter decreased from 182 nm to 45 nm when the flow rate was increased from 20 mL/min to 70 mL/min.The sizes and morphologies of the particles prepared using the double hollow fiber membrane dispersion technology were characterized by scanning electron microscopy and compared with those of particles prepared by single hollow fiber membrane dispersion technology.