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

Adopting chemical reduction, nano-copper particle which size distribution is narrow, degree of purity is high and the average particle diameter is 47.5nm. By using X-ray diffraction, laser particle size analyzer, scanning electron microscopy and other tests, the acquired samples were characterized by measuring sedimentation ratio, ultrasonic 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-H2O 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.