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以PEG4000和(NH_4)2SO_4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(Fe_3O_4)纳米粒子。采用XRD、TEM、VSM、FT-IR等对Fe_3O_4进行性能表征,证明所合成的Fe_3O_4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/(NH_4)2SO_4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/(NH_4)2SO_4双水相体系中PEG4000的质量分数为18%、(NH_4)2SO_4的质量分数为25%,反应温度为60℃,反应时间为1 h。
PEG4000 and (NH4) 2SO4 as the aqueous two-phase system and diisopropylamine as the precipitating agent were used to improve the coprecipitation method to synthesize Fe3O4 nanoparticles. The properties of Fe_3O_4 were characterized by XRD, TEM, VSM and FT-IR. The results show that the synthesized Fe_3O_4 particles are spheroidal with a good spinel structure, good stability and dispersion, uniform size and particle size of about 11 nm Nanoparticles, with excellent superparamagnetism and high magnetization and other characteristics. At the same time, the conditions of reaction temperature and concentration of iron ion and the concentration of PEG4000 / (NH_4) 2SO_4 on the formation of aqueous two-phase system were explored. The optimum technological scheme was n (Fe2 +): n , 1.0 g Fe Cl2 · 4H2O, 1.2 g Fe Cl3, 10 m L diisopropylamine and PEG4000 / (NH4) 2SO4 aqueous two-phase system. The mass fraction of PEG4000 was 18% and the mass fraction of (NH4) 2SO4 was 25% The reaction temperature was 60 ℃, the reaction time was 1 h.