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以单甲氧基聚乙二醇、对甲苯磺酰氯、邻苯二甲酰亚胺钾等为原料,根据盖布瑞尔合成法原理,合成了一端为氨基的单甲醚聚乙二醇（mPEG-NH2）。并以其为还原剂,聚乙二醇（PEG）为溶剂,利用热分解法制备了水分散性的超顺磁性纳米Fe3O4。采用红外光谱（FT-IR）、X射线衍射（XRD）、透射电镜（TEM）、热重分析（TG）、超导量子干涉仪（SQUID）和纳米粒度与Zeta电位分析仪等测试技术对其性能进行表征,实验结果表明,所制得的纳米Fe3O4粒子结晶度高,粒度均匀,分散良好,平均粒径为（12.2±1.6）nm,具有超顺磁性,饱和磁化强度为54 emu/g,在中性水溶液中其表面带正电,Zeta电位为＋33 mV。TG测试结果表明,Fe3O4纳米粒子表面有机物的含量约为28%,Fe3O4的产率为57%左右。

Using monomethoxypoly（ethy1ene glycol）（mPEG）,p-toluenesulfonyl chloride（TsCl） and potassium salt of phthalimide（PPI） as raw materials,amino-monomethoxypoly（ethy1ene glycol）（mPEG-NH2） was synthesized based on the principle of Gabriel synthesis.Then water-soluble magnetite nanoparticles was fabricated by thermal decomposition of iron（III） acetylacetonate（Fe（acac）3） in polyethylene glycol（PEG） solvent using mPEG-NH2 as the reducing agent.The products was characterized by FT-IR,XRD,TEM,TG,superconductivity quantum interference device（SQUID） and laser particle size and Zeta potential analyzer.FT-IR analysis showed that the target product mPEG-NH2 was achieved.XRD patterns show that magnetite nanoparticles had the face centered cubic（fcc） crystal structure.The morphology analysis by TEM confirmed that magnetite nanoparticles had a relatively uniform size distribution with the average diameter of（12.2±1.6） nm.The Zeta potential distribution plot of the magnetite nanoparticles in an aqueous suspension（pH=7） was ＋33 mV.The magnetization curve measured by SQUID showed the nanoparticles had superparamagnetic characteristics and the saturation magnetization were 54 emu/g at 300 K.The results of TG analysis indicated that the coating amount of copolymer on Fe3O4 nanoparticles was 28%.The yield of Fe3O4 was estimated to be about 57%.