用中空纤维膜分散技术制备纳米颗粒

Preparation of nanoparticles using hollow fiber membrane dispersion technology

采用中空纤维膜为分散介质,以制备纳米BaSO4为例,探索膜分散制备纳米颗粒技术。实验以Na2SO4溶液为连续相,将BaCl2溶液通过中空纤维膜均匀分散到Na2SO4溶液中,在透过膜的微小液滴形成的微环境中实现两种溶液的微观混合,并反应生成BaSO4颗粒。实验研究了膜组件构型、反应物浓度、分散剂、膜孔孔径大小等因素对BaSO4颗粒形貌、大小和粒度分布的影响。结果表明:采用膜截留分子量为10000的中空纤维膜制成的浸没式膜组件,反应物Na2SO4和BaCl2溶液浓度均为0.02mol/L,加入分散剂聚乙二醇(PEG)制得了平均粒径在10～30nm、球形度好、单分散性好的纳米BaSO4颗粒。

The use of membrane dispersion technology for the preparation of barium sulfate nanoparticles has been investigated using hollow fiber membranes as the dispersion medium. Sodium sulfate solution was used as the continuous phase and barium chloride solution was dispersed into the sodium sulfate solution through the hollow fiber membrane. Microcosmic mixing of the two solutions resulted in the formation of barium sulfate particles. The influence of membrane model, reactant concentrations, dispersant, and membrane pore size on particle morphology, particle size and size distribution were investigated. The results showed that spherical barium sulfate particles with a narrow size distribution could be prepared using a submerged membrane model, with the average particle size being in the range 10-30 nm.