微波水热法制备超顺磁性Fe3O4纳米粒子

采用微波水热法制备超顺磁性Fe3O4纳米粒子,讨论了Fe3 ]/Fe2 ]、晶化温度、晶化时间、pH值4因素对平均粒度大小的影响,探索Fe3O4纳米粒子的最佳制备条件,在该基础上采用油酸对其进行表面改性。利用XRD、FT-IR、TEM和VSM对Fe3O4纳米粒子的结构、形貌、磁性能进行表征。结果表明,改性后的纳米Fe3O4粒子为粒度均匀的球形,具有良好的分散性,平均粒径约8 nm;该产物具有超顺磁性,饱和磁化强度为61.8 emu/g。

Preparation of superparamagnetic Fe304 nanoparticle by microwave hydrothermal method

Fe3O4 nanoparticle was prepared by the micro-wave hydrothermal method in the paper.The influences of different factors on the average diameter of Fe3O4 nanoparticle were evaluated by the orthogonal-design method to obtain the optimum parameters for preparing the nanoparticle.Four factors with three levels were considered in the experiment,which were molar proportion of Fe3 ]/Fe2 ],crystallization temperature,crystallization time and pH.The surface of the Fe3O4 magnetic nanoparticle was modified by oleic acid.The structure,morphology and magnetism of the composite were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)t,ransmission electron microscope(TEM) and vibration showpiece magnetor(VSM).The results showed that the coated Fe3O4nanoparticles were uniform spheres and had good dispersion,and its average diameter was about 8 nm.In addition,the composite had superparamagnetism and the saturation magnetization intensity was 61.8 emu/g.