用水热法制备了Fe_3O_4纳米磁流体样品,测试了样品对磁场的响应度,利用原子力显微镜表征分析磁流体的微结构特征,观测了磁流体材料颗粒粒径大小及形貌,且重点分析了磁特性与微结构的关系.分析结果表明,制备的Fe_3O_4纳米磁流体粒径大小约为5.00nm;不同质量分数的配比影响着磁流体对磁场的响应度,质量分数为10%时的响应度最高;磁流体所表现的磁特性与链状微结构变化紧密相关,纳米颗粒在Fe_3O_4磁流体中的分布情况决定了其链状微结构的变化.
This paper introduced the preparation,performance and applications of Fe_3O_4 nano-magnetic ferrofluid,principally observed the characterization of microstructure by atomic force microscope (AFM),and measured the particle size and morphology of nano-magnetic ferrofluid.The magnetic property was analyzed from the microstructure characterization,the analysis results show that: the size of Fe_3O_4 nano-particle is about 5.00nm,the magnetic property is closely related to the chain microstructure and influenced by nano-particles distribution in Fe_3O_4 magnetic ferrofluid.
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