纳米银溶胶稳定性的影响机制研究  

Study on Stability of Nano Colloidal Silver

作　　者：李世琳[1] 毛健[1] 陈治[1] 李华峰[2] 陈国需[2] 蒋渝[1] 

机构地区：[1]四川大学,四川成都610065 [2]解放军后勤工程学院,重庆400016

出　　处：《稀有金属材料与工程》2008年第8期1436-1440,共5页Rare Metal Materials and Engineering

基　　金：重庆市重点自然科学基金项目(CSTC2005BA4019);四川省科技厅攻关项目(05GG009-004-2)

摘　　要：用NaBH4还原AgNO3制备了纳米银溶胶,考察了反应温度、反应时间、搅拌速度和固体颗粒浓度对溶胶粒度和zeta电位的影响规律。研究发现,反应温度对粒度影响不明显,zeta电位绝对值随温度升高而升高,胶体稳定性上升;反应时间小于10min会产生黑色沉淀,反应时间大于10min后,对粒度影响不明显,zeta电位绝对值随时间增长有降低的趋势,胶体稳定性下降;搅拌速度升高,粒度减小,zeta电位的绝对值有升高趋势,胶体稳定性上升;溶胶中的银颗粒浓度由0.05‰提高到0.07‰时,zeta电位的绝对值降低,粒度增大,胶体稳定性降低。In this work, the nano colloidal silver was prepared by reduction from silver nitride with sodium boron-hydride, and the effects of reaction temperature, time, stirring velocity and particle concentration in sol on stability of nanoscale silver particle size and zeta potential were investigated. The results showed that the effect of reaction temperature on the particle size is not obvious, with the increase of temperature, the zeta potential increases, and stability of colloid is improved. When the reaction time is less than ten minutes, there is black precipitation in the colloid to occur. As the reaction time is more than ten minutes, the change of final particle size is little, and zeta potential has a decreased trend, so the stability of colloid decreases. With the increase of stirring velocity, the particle size decreases and zeta potential increases, and the stability of colloid increases. As the materials concentration increases from 0.05‰ to 0.07‰, zeta potential decreases and the particle size increases, and the stability of colloid decreases.

关 键 词：银溶胶 粒度 ZETA电位 稳定性 

分 类 号：TB383.1[一般工业技术—材料科学与工程]