Effect of Different Dispersants on Dispersion Capability of Nano-sized Iron Powders

Nonionic and anionic dispersants were chosen on the basis of zeta value measurement of nano-sized iron powders prepared by high-vacuum DC Arc Plasma evaporation, The effect of oleic acid, polyvinylpirrolidone (PVP) and sodium dodecyl benzene sulfonate (SDBS) on dispersion capability of nano-sized iron powders was systematically studied. The results show that: the ultrasonic time, concentration of dispersant and pH has significant effect on dispersion property, with increase of ultrasonic time and surfactant concentration, the effect of dispersion firstly increases, then decreases; PVP and oleic acid have better effect on dispersing property of nano-sized iron powders, the dispersion effect is in the degrading order: PVPoleic acid SDBS. the optimal parameters are pH= 10, ultrasonic powder is 560 W, ultrasonic time is 15 min and the concentration of PVP is 4 wt% when absolute ethanol is used as solvents.