通过共沉淀法成功制备出聚乙二醇-4000(PEG-4000)包覆的Fe3O4磁流体,用XRD表征了磁性粒子的物相和粒径,研究了磁流体中Fe3O4的质量浓度以及溶液pH值对磁流体稳定性的影响.结果表明:未包覆的磁流体粒径为20nm,而包覆后的磁流体粒径为11.5nm;磁流体的稳定性随着质量浓度的增加而下降;在pH=3～8的溶液中,磁流体的稳定性随着pH的增加而降低.
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