Facile synthesis of size-controllable monodispersed ferrite nanospheres†
Facile synthesis of size-controllable monodispersed ferrite nanospheres†
复制标题
DOI：
10.1039/c0jm00159g
复制
发表时间：
2010-06
影响因子：
--
通讯作者：
S. Xuan;Feng Wang;Yi-Xiang J. Wang;Jimmy C. Yu;K. Leung
中科院分区：
文献类型：
--
作者：
S. Xuan;Feng Wang;Yi-Xiang J. Wang;Jimmy C. Yu;K. Leung
以聚乙烯吡咯烷酮（PVP）为表面活性剂，在乙二醇/二乙二醇（EG/DEG）二元溶剂中合成了单分散铁氧体纳米微球。粒度控制可以通过仔细调整VEG/VDEG的比例来实现。不同于以往的报道，我们的铁氧体铁（Fe3O4）纳米球的磁性研究表明，不同尺寸的Fe3O4纳米球具有相似的磁饱和度（Ms）值。特别地，通过改变反应体系中H2O的浓度，可以选择性地获得具有相似Ms的铁磁性和超顺磁性的Fe3O4纳米球。磁共振成像（MRI）表征表明，制备的超顺磁性Fe3O4和ZnFe2O4纳米球具有T2弛豫范围，可作为潜在的MRI造影剂。
Monodispersed ferrite nanospheres were synthesized in an ethylene glycol/diethylene glycol (EG/DEG) binary solvent by using poly(vinylpyrrolidone) (PVP) as the surfactant. Particle size control can be attained by careful adjustment of the VEG/VDEG ratio. Different from previous reports, the magnetic studies of our iron ferrite (Fe3O4) nanospheres with various sizes from 20 to 300 nm reveal that they exhibit a similar magnetic saturation (Ms) value. In particular, both the ferromagnetic and superparamagnetic Fe3O4 nanospheres with similar Ms can be selectively obtained by varying the H2O concentration in the reaction system. The magnetic resonance imaging (MRI) characterization indicates that the as-prepared superparamagnetic Fe3O4 and ZnFe2O4 nanospheres possess a T2 relaxivity range that can be used as potential MRI contrast agents.