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通过化学共沉淀法、水热法和超声波化学法3种不同途径制备Fe3O4超顺磁性纳米颗粒,并通过TEM、IR、XRD、PPMS等研究了颗粒形貌、结构及特性。在n(Fe3+)/n(Fe2+)物质的量比1.6,氨水为共沉淀剂,p H9条件下制备前驱物,使用上述3种方法在适宜环境下均能制得Fe3O4颗粒。结果表明3种方法均制备了平均粒径小、饱和磁化强度高的Fe3O4超顺磁性纳米颗粒体系。水热法制成的颗粒磁学性能相对更好,化学共沉淀法制备的颗粒分散状态和晶型结构更为优良,3种途径制备的颗粒体系表面均有活性高的羟基,有利于其表面改性及功能基团修饰。独特性能的Fe3O4超顺磁性纳米颗粒可被广泛地应用于固定化酶载体等领域。
Fe3O4 superparamagnetic nanoparticles were prepared by chemical coprecipitation, hydrothermal method and ultrasonic chemical method. The morphology, structure and properties of the particles were studied by TEM, IR, XRD and PPMS. Fe3O4 particles were prepared under the conditions of n (Fe3 +) / n (Fe2 +) molar ratio of 1.6, ammonia as coprecipitant and p H9 as precursors. The results show that the Fe3O4 superparamagnetic nanoparticle system with small average particle size and high saturation magnetization has been prepared by the three methods. The magnetic properties of the particles prepared by hydrothermal method are relatively better, the particles prepared by the chemical coprecipitation method have better dispersion state and crystal structure, and the hydroxyl groups on the surface of the prepared particles have high activity, which is beneficial to the surface modification Sexual and functional group modification. The unique properties of Fe3O4 superparamagnetic nanoparticles can be widely used in the field of immobilized enzyme vectors.