采用共沉淀—相转化法制备出Dy0.15Fe1.85O3纳米磁颗粒,用月桂酸进行了在线有机改性,干燥后用中间体包覆,在超声振荡下将其分散在硅油中,得到硅油基磁流体.研究了月桂酸用量(wt)对磁颗粒性能及中间体用量(wt)对磁流体稳定性的影响.用TEM、XRD对磁颗粒进行表征、用SQUID、VSM对样品的磁性能进行测试.结果表明:在n(Fe2+)/n(Fe3+)/n(Dy3+) =1∶2∶0.011,反应温度为50℃,月桂酸用量为0.05g/g(磁颗粒),中间体用量为(0.42～0.58)g/g(磁颗粒)的条件下,制得的磁流体具有较强的稳定性和优异的磁性能.
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