Cobalt and silica based core-shell structured nanospheres
Cobalt and silica based core-shell structured nanospheres
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DOI：
10.1039/b604883h
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发表时间：
2006-01-01
影响因子：
--
通讯作者：
Correa-Duarte, Miguel A.
中科院分区：
文献类型：
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作者：
Salgueirino-Maceira, Veronica;Correa-Duarte, Miguel A.
本文介绍了工程粒子结构的最新策略，使用胶体化学的方式，环境稳定的二氧化硅包覆的钴纳米粒子和钴包覆的二氧化硅球的制备结合硼氢化钠在水溶液中的还原，Stober方法，和/或逐层自组装技术。我们强调在水溶液中的钴簇的合成和操作产生单分散的积木。二氧化硅包覆的钴纳米颗粒，其核和壳可以根据实验条件进行调节，也被发现在由弱外部磁场驱动时组织成链，并且强偶极-偶极磁相互作用被认为是自组织的驱动力。利用层层自组装技术，将相同的钴簇用于制备钴包覆的二氧化硅球。这种类型的胶体的纳米级工程预计将扩展磁效应和功能的范围。
This article presents state-of-art strategies for engineering particle structure using colloidal chemistry in such a way that environmentally stable silica-coated cobalt nanoparticles and cobalt-coated silica spheres were prepared combining sodium borohydride reduction in aqueous solution, the Stober method, and/or the layer-by-layer self-assembly technique. We highlight the synthesis and manipulation of cobalt clusters in aqueous solution producing monodisperse building blocks. Silica-coated cobalt nanoparticles, whose core and shell can be tuned depending on the experimental conditions, were also found to organize into chains when driven by a weak external magnetic field and strong dipole - dipole magnetic interactions are believed to be the driving force for the self-organization. The same cobalt clusters were used for the preparation of cobalt-coated silica spheres taking advantage of the layer-by-layer self-assembly technique. The nanoscale engineering of this type of colloids is expected to extend the spectrum of magnetic effects and functionalities.