Pure square γ-Fe₂O₃ and Co²⁺, Dy³⁺ doped γ-Fe₂O₃ nanoparticles were prepared by coprecipitation method, using ferrous sulfate as the iron source, and anhydrous CoCl₂, DyCl₃ as doping sources. Nano-magnetic structures and properties were characterized using transmission electron microscopy, X-ray diffraction, X-ray energy dispersive spectroscopy, vibrating sample magnetometer, Mössbauer spectrometer and fluorescence spectrophotometer. Effects of Co²⁺ and Dy³⁺ doping amount on their structures, morphologies, magnetic properties and PL properties were discussed. It was found that Co²⁺ and Dy³⁺ doped γ-Fe₂O₃ nanoparticles showed good fluorescent properties and better magnetic properties than pure γ-Fe₂O₃ with a saturation magnetization at 63.24 emu g⁻¹. Both the 7.56% Co²⁺ doped and 0.83% Dy³⁺ doped γ-Fe₂O₃ reached maximum saturation magnetization at 72.72 and 67.54 emu g⁻¹ respectively. In order to provide a reference for further magnetic targeting drug experiments and animal experiments, the “in vitro” simulation study of magnetic particle targeting in mimetic blood vessels was also carried out.

中文翻译：

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Co 2+和Dy 3+掺杂的方形γ-Fe2 O 3纳米粒子的磁和体外模拟靶向特性的研究

纯正方形了γ-Fe ₂ ö ₃和Co ²⁺，镝³⁺掺杂了γ-Fe _2级ö ₃通过共沉淀方法制备的纳米粒子，使用硫酸亚铁作为铁源，和无水氯化钴₂，DyCl ₃作为掺杂源。使用透射电子显微镜，X射线衍射，X射线能量色散光谱，振动样品磁力计，Mössbauer光谱仪和荧光分光光度计对纳米磁性结构和性能进行了表征。讨论了Co ²⁺和Dy ³⁺掺杂量对其结构，形貌，磁性能和PL性能的影响。发现Co²⁺和Dy ³⁺掺杂了γ-Fe _2个ö ₃纳米颗粒表现出良好的荧光特性和更好的磁特性比纯γ-的Fe ₂ ö ₃在63.24鸸鹋克与饱和磁化强度^-1。无论是7.56％的Co ²⁺掺杂和0.83％的Dy ³⁺掺杂了γ-Fe ₂ ö ₃达到最大饱和度在72.72 67.54鸸鹋克磁化和^-1分别。为了为进一步的磁性靶向药物实验和动物实验提供参考，还对模拟血管中的磁性粒子靶向进行了“体外”模拟研究。