柠檬酸钠改性的Fe_3O_4磁性纳米粒子的快速制备

A rapid synthesis of Fe_3O_4 magnetic nanoparticles modified by sodium citrate

以FeSO_4·7H_2O为单一铁源,浓氨水为沉淀剂,柠檬酸钠为表面改性剂利用简单回流法快速合成Fe_3O_4磁性纳米粒子。考察反应时间,反应温度及浓氨水加入方式对合成Fe_3O_4磁性纳米粒子的影响,并利用动态光散射仪、傅立叶红外射线光谱仪及透射扫描电镜等对合成的Fe_3O_4磁性纳米粒子进行表征。结果表明,以柠檬酸钠为表面改性剂,逐滴加入浓氨水,反应温度为(70～80)℃和反应时间为6 min时,获得的Fe_3O_4磁性纳米粒子在水中具有良好的分散性及磁响应性。Zeta电位和红外光谱同时表明,柠檬酸钠成功地吸附于Fe_3O_4磁性纳米粒子的表面(Fe_3O_4@SC),且Zeta电位值为-31.3 mV;透射扫描电镜显示获得的Fe_3O_4@SC磁性纳米粒子呈球状结构,粒径约为10 nm。

Fe3O4 magnetic nanoparticles were successfully synthesized by a simple reflux method using FeSO4·7H2O as single iron source,concentrated ammonia and sodium citrate acted as precipitator and mild stabilizer,respectively.Effects of reaction time,reaction temperature and way of adding ammonia were investigated.The synthesized magnetic Fe3O4 anoparticles were characterized by dynamic light scattering(DLS),infrared spectrometer(FT-IR)and transmission electron microscope(TEM).The results showed that magnetic Fe3O4 anoparticles had good dispersibility and magnetic responsiveness in water when sodium citrate was used as surface modifier and concentrated ammonia water was added drop by drop,meanwhile,reaction temperature was set as(70-80)℃and reaction time was set as 6 min.Zeta potential and FT-IR results showed that sodium citrate was well adsorbed onto surface of Fe3O4 magnetic nanoparticles(Fe3O4@SC)and zeta potential was-31.3 mV.TEM results showed that size of Fe3O4@SC magnetic nanoparticles which were spherical shape was 10 nm.