中文摘要：

采用自悬浮定向流法制备的纳米Cu粉末具有一定的粒径分布范围,获得分布更窄、更均一的纳米粉末具有重要的应用价值,以达到更加突出的物理性质。本文通过测定纳米Cu-水悬浮液的Zeta电位和吸光度,探讨了不同pH值下以及不同浓度下的十二烷基磺酸钠（SDS）对纳米Cu粉末在水中分散性的影响。结果表明：Zeta绝对值越大,分散稳定性越好。在0.01%纳米Cu-水悬浮液中,在pH值为8.5,SDS分散剂加入量为0.024%（质量）时,分散性最好。在此条件下观察沉降颗粒,在4~8 h时间段内得到的沉降颗粒平均粒径为62 nm单分散性较好的颗粒,且为主要产物。

英文摘要：

The nano-Cu powder are in a certain range of particle size distribution prepared by flow-levitation technology.The exploration is aim at making the distribution of the powder more narrow and more uniform,in order to achieve a more prominent physical properties.Dispersion and stability of nano-Cu particles in water were studied under different pH values and dispersant concentration by the method of Zeta potential and absorbency.The results show that： the higher Zeta potential is,the better dispersion and stability of nano-Cu/water suspension are.When the dispersion and stability of 0.01% nano-Cu/water suspension is the best,pH 8.5 can be selected as an operating pH,and the 0.024% SDS can be selected as an optimizing concentration.Observing the sedimentation particles under these conditions,the average particle size is about 62 nm from 4 to 8 h period of time and as the main product.