添加AOT的微乳液法制备纳米SnO2及其表征
Preparation and characterization of nanosize SnO2 particles with AOT surfactant from water-in-oil micromulsions

采用AOT( 二-乙基己基琥珀酸酯磺酸钠)为表面活性剂，以正庚烷为油相，以四氯化锡为前驱物，采用油包水型微乳液法制备了纳米SnO2颗粒，并借助XRD、DTA-TG、FTIR、SEM等手段系统研究了制备温度、AOT质量、溶液pH值等因素对产物性能的影响. 本实验体系中的最佳工艺参数为：pH=8，水-表面活性剂摩尔比1 ∶2，AOT质量0.6 g，锻烧温度600 ℃，保温时间2 h. 在最佳试验条件下所制备的SnO2粉末平均粒径为4.1 nm，较常规沉淀法制备的SnO2颗粒细小且团聚少，具有更好的性能.
Nanoparticles of tin oxide (SnO2) have been prepared from water-in-oil (W/O) micro emulsions consisting of SnCl4，water，AOT，and n-heptane. The effects of calcination temperature，AOT contents and pH values of solution on the properties of products were studied by XRD，DTA-TG，FTIR and SEM. Results show that the optimal condition in the system is：pH value of the solution was 8，the molar ratio of water to AOT was 1 ∶2，the content of AOT was 0.6 g and the products was calcined at 600 ℃ for 2 h. The tin oxide powder was found to be less than 4.1 nm in particle diameter and to be more disperse than it prepared by the chemical precipitation method