用微乳液法制备了明胶包裹的复合氧化铁纳米量级超细微粒.XRD,TEM,SEM和IR测试表明:微粒为明胶包裹球形超细微粒.微球的粒径为1.5 μm～3 μm,而微粒的粒径为20 nm.每个复合微球中约有35个～90个氧化铁粒子.该复合微粒的比饱和磁化强度σs=62 Am2/kg,矫顽力Hc=187 Oe,剩磁r=10.18 Am2/kg,具有硬磁体的性质.将其用于制备磁流变液,在低的磁场强度下有较大的MR效应,沉降稳定性优于用羰基铁粉制成的磁流变液.
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