不同分散剂对纳米铁粉分散性能的影响

通过对直流氢电弧蒸发法制备的纳米铁粉Zeta电位的测量,选用非离子型和阴离子型2类分散剂,分别研究了油酸、聚乙烯吡咯烷酮（PVP）和十二烷基苯磺酸钠（SDBS）3种分散剂对纳米铁粉分散性能的影响.结果表明：超声时间、分散剂加入量及pH值对分散效果影响显著,随着超声时间和表面活性剂加入浓度的提高,粉体分散效果呈先增大后减小的趋势;PVP和油酸对纳米铁粉的分散效果较好,分散剂分散效果从高到低顺序依次为：PVP＞油酸＞SDBS;推荐最佳分散工艺：无水乙醇作为溶剂,超声功率560 W,超声时间15 min,pH等于10,PVP加入量4%.

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: PVP>oleic 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.