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Fe3O4 nano-magnetic particles is widely used as a functional nanomaterials, with a large surface area, high surface activity, suspension stability, strong adsorption capacity, and other special physical properties. In the magnetic field has a magnetic, electrical, optical and other specific energy in the chemical, mechanical, electronic communications, biomedical, environmental, military and other fields have received the application. But by their own magnetic properties and antioxidant properties, its application is restricted areas, with the physical and magnetic properties of the application requirements increase, Fe3O4 Magnetic Nanoparticle Modification of attention. REE has a special f electron configuration, 5s and 5p electronic 4f electrons of the inner layer from the environment, will exhibit a special rare earth doped optical, electrical and magnetic phenomena. Having a high saturation magnetization of the rare earth elements doped Fe3O4 nano-magnetic particles, Nano rare earth magnetic materials, develop new applications, nano-magnetic field of research is an important issue. Article explains to FeSO4 · 7H2O2 Fe2 (SO4) 3 · xH2O, Dy (NO3) 3 · xH2O, NaOH as raw materials, chemical coprecipitation of different particle sizes of Dysprosium Ferrite Magnetic Nanoparticle findings. In order to prevent the magnetic particles are generated when the hard aggregates in the dry, surface-modified with lauric acid. Investigated by orthogonal experimental molar ratio of raw materials and under certain conditions the molar concentration, reaction temperature, stirring speed, reaction time and other major process parameters on the formation of dysprosium ferrite particles, morphology and size of . Studied the changes in particle size of magnetic particles on the magnetization, coercive force and residual magnetization of. X-ray diffraction (XRD) analysis of dysprosium ferrite particles phase, crystal structure; using Fourier transform infrared spectroscopy (FT-IR) analysis of dysprosium ferrite phase particles, the surface chemical environment; using transmission electron microscopy (TEM) observations without surface modification of dysprosium ferrite particle morphology and particle size; using superconducting quantum magnetometer (SQUID) test surface modification of dysprosium ferrite magnetic particles at room temperature energy. Orthogonal experiment results show that the process parameters on the formation of dysprosium ferrite particles, morphology and size have a major impact, wherein the reaction temperature is most affected, followed by reaction time, stirring speed with minimal impact; XRD patterns show that, Dysprosium ferrite main phase of the magnetic particles is Fe3O4, a face-centered cubic crystal spinel structure, high degree of crystallinity; FT-IR spectrum showed that the surface of magnetic particles changes the chemical environment, between the surfactant produce a strong chemical action; transmission electron microscopy (TEM) photographs, selected area electron diffraction (SAED) showed that the prepared nano-magnetic particles into the ball better, prepared under different conditions mean particle size of the magnetic particles 15 - between 24nm. Electron diffraction annular shape and a bright spot on the circle, indicating that the magnetic particle has been crystallized, the crystal has good; room temperature hysteresis loops show that the same magnetic field strength, the magnetization of the magnetic particles intensity increases with the particle size. Meanwhile, the coercive force and residual magnetization increases.
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