Preparation of Tin Nano-powders and Their Dispersion Stability

To make tin nano-powders disperse well and steadilyin ethylene glycol aqueous solution,tin nano-powders with average particle size of 106 nm were prepared by direct current arc plasma evaporation method using fabricated apparatus.With sodium dodecyl sulfate,sodium hexametaphosphate,poly(ethylene glycol) as dispersants,dispersing performance of tin nano-powders in aqueous solution of ethylene glycol were researched.Effect of dispersing time,surface active agent type and content on the scattered performance of tin nano-powders was analyzed.The results show that all surfactants promote the dispersion stability of ultrafine powders.With the extending of ultrasonic time and the increase of dispersant concentration,the dispersion effect of tin nano-powders increases at first and then decreases.The best dispersion condition of ultrafine tin nano-powders in aqueous solution of ethylene glycol is confirmed as that adding into sodium dodecyl sulfate with mass fraction of 3% and the ultrasonic time is 60 min.