摘要：采用化学共沉淀法制备粒径小于10 nm的油溶性Fe₃O₄纳米颗粒,对其结构和性能进行表征,并讨论氨水加入方式对Fe₃O₄纳米颗粒形貌和产率的影响。结果表明:油酸成功包覆在反尖晶石型Fe₃O₄纳米颗粒的表面,并使其在多种油性溶剂中具有良好的分散性能;磁滞回线显示制得的Fe₃O₄纳米颗粒具有良好的超顺磁性;氨水加入方式的改变对Fe₃O₄纳米颗粒的生长具有明显的影响,进而影响Fe₃O₄纳米颗粒的产率。

关键词：化学共沉淀法；Fe₃O₄纳米颗粒；磁性材料

Abstract： Oil soluble Fe₃O₄ nano-particles with particle size less than 10 nm were prepared by the simple coprecipitation method. The structure and properties of the Fe₃O₄ nano-particles were characterized. Effect of adding methods of NH₃·H₂O on morphology and yield of the Fe₃O₄ nano-particles was discussed. The results show that the inverse spinel Fe₃O₄ nano-particles are coated by oleic acid and can be dissolved in a variety of organic solvents. Magnetic hysteresis loops indicate that the Fe₃O₄ nano-particles are superparamagnetic materials. Growth and yield of the Fe₃O₄nano-particles are significantly influenced by modifying adding methods of NH₃·H₂O. 

Keywords: chemical coprecipitation method； Fe₃O₄ nano-particle；magnetic materials