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采用柠檬酸盐溶胶-凝胶法、快速升温和预烧热处理工艺合成球形BaFe12O19纳米粒子,并通过硅烷偶联剂进行表面改性。用热重-差热分析、Fourier红外光谱、X射线衍射、扫描电镜、振动样品磁强计和激光纳米粒度仪表征样品的结构、形貌、粒度分布及磁性能。结果表明:750℃可以合成高纯度球形BaFe12O19纳米粒子,粒径为30～50nm,饱和磁化强度为43.95A/(m·kg)。粒子经表面改性后,成功接枝上功能基团—NH—和—NH2,饱和磁化强度增大至49.36A/(m·kg)。热处理温度越高,BaFe12O19的饱和磁化强度越高。
Spherical BaFe12O19 nanoparticles were synthesized by citrate sol-gel method, rapid heating and pre-calcination heat treatment, and were surface modified by silane coupling agent. The structure, morphology, size distribution and magnetic properties of the samples were characterized by TG-DTA, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer and laser nanoparticle analyzer. The results show that the BaFe12O19 spherical nanoparticles with high purity can be synthesized at 750 ℃ with a particle size of 30-50 nm and a saturation magnetization of 43.95 A / (m · kg). After the surface modification of the particles, the functional groups -NH- and -NH2 were successfully grafted, and the saturation magnetization increased to 49.36 A / (m · kg). The higher the heat treatment temperature, the higher saturation magnetization of BaFe12O19.