Stjerndahl Maria, Andersson Martin, Hall Holly E, Pajerowski Daniel M, Meisel Mark W, Duran Randolph S
Department of Chemistry and Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
Langmuir. 2008 Apr 1;24(7):3532-6. doi: 10.1021/la7035604. Epub 2008 Mar 1.
Using a water-in-oil microemulsion system, silica nanoparticles containing superparamagnetic iron oxide (SPIO) crystals have been prepared and characterized. With this method, the loading of iron oxide crystals, the thickness of the silica shells, and the overall particle sizes are tunable. Moving from low to high water concentration, within the microemulsion region, resulted in a gradual shift from larger particles, ca. 100 nm and fully loaded with SPIOs, to smaller particles, ca. 30 nm containing only one or a few SPIOs. By varying the amount of silica precursor, the thickness of the silica shell was altered. Field dependent magnetization measurements showed the magnetic properties of the SPIOs were preserved after the synthesis.
利用油包水微乳液体系，制备并表征了含有超顺磁性氧化铁（SPIO）晶体的二氧化硅纳米颗粒。通过这种方法，氧化铁晶体的负载量、二氧化硅壳层的厚度以及整体粒径都是可调的。在微乳液区域内，从低水浓度到高水浓度的变化导致了颗粒从较大尺寸（约100 nm且完全负载SPIO）逐渐转变为较小尺寸（约30 nm，仅含有一个或几个SPIO）。通过改变二氧化硅前驱体的量，可以改变二氧化硅壳层的厚度。场依赖磁化测量表明，合成后SPIO的磁性得以保留。
