液相法制备纳米氧化锡防团聚方法综述

针对液相法制备纳米氧化锡颗粒团聚的问题,以溶胶-凝胶法为例,介绍了防团聚的几种措施:加入表面活性剂,有机溶剂洗涤,共沸蒸馏及冷冻干燥等.这几种方法虽可以制备出粒径较小,均匀,分散性好的粒子,但也各有优缺点:反应时加入表面活性剂,容易引入杂质;有机溶剂洗涤廉价而便利,但是存在洗涤凝胶滤饼时溶剂漏滤的问题;而共沸蒸馏需要特殊的减压装置,比较看来,利用有机溶剂洗涤是一种相对方便的办法.

Antiaggregation Method in Liquid Preparation of Nanometer Tin Dioxide

Aggregation is a main problem in liquid preparation of nanometer tin dioxide.Several antiaggregation method are introduced,which include adding dispersant,washing with organicsolvent,azeotropic distillation,freeze drying and so on.Although these methods may prepare smaller and more uniform nanoparticles,they have their disadvantages: Impurity is brought in when adding surfactant in reaction,organicsolvent method is a cheaper and easier method,but solvent is easy to leave out when gel cake is washed,azeotropic distillation needs special decompressorto distillate.In comparison,organicsolvent method is an advantage methodsrelatively.