纳米铜的制备及其在水介质中的分散工艺研究

Preparation of Copper Nano-particles and Dispersion Technics in Aqueous System

采用化学还原法,制备出了粒径分布较窄,纯度高,平均粒径为47.5nm的纳米铜粉,并通过X射线衍射仪、激光粒度分析仪和扫描电镜等手段对其进行表征。通过沉降法研究了超声时间,分散剂十六烷基三甲基溴化铵(CTAB)的加入量,以及pH值对纳米铜粉在水中分散性能的影响。结果表明:在5wt%Cu-H2O纳米胶体中,超声时间20 min使其分散稳定性最佳;在10wt%Cu-H2O纳米胶体中加入2wt%的CTAB做分散剂,超声时间20 min时,粒子分散效果较好,稳定性最佳;调节pH值在8.80左右时,Cu-H2O纳米胶体的分散稳定性最佳。

Adopting chemical reduction, nano-copper particle which size distribution is narrow, degree of purity is high and the average particle diameter is 47.5nrrL By using X-ray diffraction, laser particle size analyzer, scanning electron microscopy and other tests, the acquired samples were characterized by measuring sedimentation ratio, ulWasonic time. The effect of adding amount of dispersant CTAB and pH value on the copper nanoparticles dispersed properties in water were studied. The results show that：in 5wt% Cu-H2O colloids, the best dispersion stability can be obtained by ultrasonic for 20 min. When the ultrasonic time is 20 min, adding the mass fraction of 2% CTAB into the 10wt% Cu-H20 colloids as dispersant, the dispersed effect of particle is better and the dispersion stability is best. Adjusting pH value to 8.80, Cu-H2O colloids＇ dispersion stability is best.