Synthesis of SiO2-coated ZnMnFe2O4 nanospheres with improved magnetic properties.
A core-shell structured composite, SiO2 coated ZnMnFe2O4 spinel ferrite nanoparticles (average diameter of approximately 80 nm), was prepared by hydrolysis of tetraethyl orthosilicate (TEOS) in the presence of ZnMnFe2O4 nanoparticles (average diameter of approximately 10 nm) synthesized by a hydrothermal method. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM). The magnetic measurements were carried out on a vibrating sample magnetometer (VSM), and the measurement results indicate that the core-shell samples possess better magnetic properties at room temperature, compared with paramagnetic colloids with a magnetic core by a coprecipitation method. These core-shell nanospherical particles with self-assembly under additional magnetic fields could have potential application in biomedical systems.
Wang
Jun
J
Faculty of Science, Ningbo University, Ningbo 315211, China.
Zhang
Kai
K
Zhu
Yuejin
Y
D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000032:analysis / Q000737:chemistry*; D017616:Magnesium Compounds / Q000032:analysis / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012822:Silicon Dioxide / Q000032:analysis / Q000737:chemistry*; D017967:Zinc Compounds / Q000032:analysis / Q000737:chemistry
D020099:Coated Materials, Biocompatible; D005290:Ferric Compounds; D017616:Magnesium Compounds; D017967:Zinc Compounds; C016546:magnesium ferrite; D012822:Silicon Dioxide