Magnetic iron oxide nanoparticles were prepared by solution combustion synthesis, using iron nitrate as oxidizer and citric acid as fuel. The influence of the combustion reaction ignition procedure, conventional heating and microwave heating, on nanoparticles characteristics was investigated. The synthesized nanoparticles were characterized by scanning and transmission electron microscopy, X-ray powder diffraction, thermogravimetric and differential scanning calorimetry, magnetic measurements, specific surface area and adsorption-desorption isotherms. The magnetic nanoparticles prepared by microwave heating exhibit larger specific surface area (70.7 m²/g), lower particle medium size (10.7 ± 3.09 nm) and lower saturation magnetization (41.8 emu/g) as compared to the sample prepared by conventional heating. Magnetic nanoparticles prepared by microwave heating were coated with oleic acid and Tween 80, and dispersed in phosphate buffered saline and distilled water. The colloidal suspensions demonstrated good stability, small polydispersity and small values of the hydrodynamic diameter, characteristics which recommend them to be tested for biomedical applications.

以硝酸铁为氧化剂，柠檬酸为燃料，采用溶液燃烧合成法制备磁性氧化铁纳米粒子。研究了燃烧反应点火程序、常规加热和微波加热对纳米颗粒特性的影响。通过扫描和透射电子显微镜、X 射线粉末衍射、热重和差示扫描量热法、磁性测量、比表面积和吸附-解吸等温线对合成的纳米粒子进行表征。微波加热制备的磁性纳米粒子表现出更大的比表面积（70.7 m ²/g)，与通过常规加热制备的样品相比，具有较低的中等粒径 (10.7 ± 3.09 nm) 和较低的饱和磁化强度 (41.8 emu/g)。微波加热制备的磁性纳米粒子用油酸和吐温 80 包被，并分散在磷酸盐缓冲盐水和蒸馏水中。胶体悬浮液表现出良好的稳定性、小的多分散性和小的流体动力学直径值，这些特性建议将它们用于生物医学应用进行测试。