Wang Jun, Zhang Kai, Zhu Yuejin
Faculty of Science, Ningbo University, Ningbo 315211, China.
J Nanosci Nanotechnol. 2005 May;5(5):772-5. doi: 10.1166/jnn.2005.093.
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.
通过在水热法合成的平均直径约为10 nm的ZnMnFe₂O₄纳米颗粒存在下，使正硅酸四乙酯（TEOS）水解，制备了一种核壳结构的复合材料，即SiO₂包覆的ZnMnFe₂O₄尖晶石铁氧体纳米颗粒（平均直径约为80 nm）。通过X射线衍射（XRD）、透射电子显微镜（TEM）和场发射扫描电子显微镜（FESEM）对所得样品进行了表征。在振动样品磁强计（VSM）上进行了磁性测量，测量结果表明，与通过共沉淀法制备的具有磁性核的顺磁性胶体相比，核壳样品在室温下具有更好的磁性。这些在附加磁场下具有自组装能力的核壳纳米球颗粒在生物医学系统中可能具有潜在应用。
