【摘要】 以PEG4000和（NH₄）2SO₄为双水相体系、二异丙胺为沉淀剂,对共沉淀法进行改进,合成了四氧化三铁（Fe₃O₄）纳米粒子。采用XRD、TEM、VSM、FT-IR等对Fe₃O₄进行性能表征,证明所合成的Fe₃O₄粒子为具有反尖晶石结构、稳定性和分散性良好、尺寸均一、粒径大小为11 nm左右的球形纳米粒子,具备优异的超顺磁性和高磁化强度等特性。同时对反应温度及铁离子浓度比、PEG4000/（NH₄）2SO₄的质量浓度对双水相体系的形成进行条件探索,确定了最优工艺方案为n（Fe2+）∶n（Fe3+）=2∶3、1.0 g Fe Cl2·4H2O、1.2 g Fe Cl3、10 m L二异丙胺,PEG4000/（NH₄）2SO₄双水相体系中PEG4000的质量分数为18%、（NH₄）2SO₄的质量分数为25%,反应温度为60℃,反应时间为1 h。更多还原

【Abstract】 Fe₃O₄of super-magnetic nanoparticles were obtained by PEG4000/（NH₄）2SO₄aqueous two-phase system under the diisopropylamine as precipitating agent. The nanoparticles of Fe₃O₄ were characterized systematically by means of XRD,FT-IR,VSM and TEM. The conditions for the preparation of Fe₃O₄ magnetic nanoparticles were optimized,with the molar ratio of Fe2+（1. 0 g） and Fe3+（1. 2 g） of 2 ∶3,under diisopropylamine（10 m L）,reaction temperature at 60 ℃,reaction time 1 h,by 18%PEG4000/25%（NH₄）2SO₄aqueous two-phase system. The resultant Fe₃O₄ synthesized under the optimum synthesis conditions showed anti-spinel structure,good dispersion stability and uniform particle size. The results revealed that the magnetic nanoparticles were spheroid shaped,and dispersed with narrow size,and the average diameter of 11 nm,and had excellent superparamagnetism and high saturated magnetization.更多还原