摘要:
本文采用溶剂热法合成了分散性好、尺寸可调、粒径均匀、饱和磁化强度较高的超顺磁性羧基化Fe3O4纳米颗粒。通过改变铁盐量制得了颗粒粒径从200 nm到800 nm可调的羧基化Fe3O4纳米颗粒，并对其形貌、结构及磁性能进行了表征。结果表明：产物为立方晶系的Fe3O4纳米球，其矫顽力及剩余磁化强度均为零，这表明样品在室温下是超顺磁性的。实验中的药品均为无毒或低毒性的，这些均满足了生物医学方面的要求。
Abstract: A solvothermal method is reported to synthesize uniform superparamagnetic carboxyl-functionalized Fe3O4 nanoparticles with good dispersity, tunable particle size and high magnetization. The particle size of the carboxyl-func- tionalized Fe3O4 nanoparticles can be tuned from approximately 200 nm to 800 nm by simply changing the concentration of iron in the reaction. The appearance, structure and magnetism of nanoparticles are characterized. The results show that the products are cubic crystal Fe3O4 nanosphere and the magnetization curves show no remnant magnetization and coercivity, indicating that both samples are superparamagnetic at room temperature. Moreover, the chemical reagents are non-toxic or low toxicity, which meet biomedical requirement.