Synthesis of monodisperse superparamagnetic Fe/silica nanospherical composites
Synthesis of monodisperse superparamagnetic Fe/silica nanospherical composites
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DOI：
10.1021/ja0380594
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发表时间：
2003-12-24
影响因子：
15
通讯作者：
Serna, CJ
中科院分区：
文献类型：
--
作者：
Tartaj, P;Serna, CJ
报道了一种制备单分散超顺磁性纳米球复合材料的新方法，该复合材料的核为金属α-Fe纳米晶分散在SiO2基体中，壳仅含SiO2。形成这种微结构的关键是在接近形成微乳液的相界上限的条件下使用层状结构，并控制金属前体的溶解度和pH。该方法的一个优点是其通用性，它允许我们改变颗粒尺寸（纳米磁体和复合材料）和纳米磁体在基质中的空间排列。我们的研究结果表明，这种材料可能是足够的生物技术应用。
A new method for the synthesis of monodisperse superparamagnetic nanospherical composites with a core containing metallic α-Fe nanocrystals dispersed in a silica matrix, and a shell only containing silica, is reported. Essential to the formation of this microstructure is to work with lamellar-like structures in conditions close to the upper-phase boundary limit for formation of microemulsions, and to control the solubility and pH of the metallic precursors. An advantage of the method is its versatility, which allows us to change the particle size (both for the nanomagnets and for the composite) and the spatial arrangement of the nanomagnets in the matrix. Our results indicate that this material could be adequate for biotechnology applications.