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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Preparation and characterization of magnetic nanoparticles and their silica egg-yolk-like nanostructures: A prospective multifunctional nanostructure platform
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Preparation and characterization of magnetic nanoparticles and their silica egg-yolk-like nanostructures: A prospective multifunctional nanostructure platform

机译：磁性纳米粒子及其二氧化硅类蛋黄纳米结构的制备和表征：一个预期的多功能纳米结构平台

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A facile solvothermal method was successfully utilized to synthesize well-crystallized magnetite (Fe3O4) nanoparticles through high-temperature decomposition of intermediate complexing compound using diethylene glycol (DEG) and diethanolamine (DEA) as solvent and complexing agent. Then a novel egg-yolk-like magnetic silica nanostructure, composed of a. silica core and another silica shell with magnetic nanoparticles embedded in the boundary, was successfully prepared by a facile one-step sol-gel technique. The experimental parameters were carefully investigated to optimize the preparation process. The diameters of final products could be effectively tuned in a wide range by use of easily obtained silica colloidal cores with different diameters. Shell thickness could be controlled by changing the addition amount of tetraethyl orthosilicate (TEOS). On the basis of the characterization, We propose a formation mechanism of the nanostructure. The pre-addition of acid solution played a key role in the procedure, enhancing the electrostatic attraction between magnetic nanoparticles and silica spherical cores. Because of the offered magnetic properties to silica beads, some aggregations were found resulting from the magnetic attraction, which shall be further improved. This strategy provides a facile method to integrate magnetic nanoparticles into a silica matrix. Additionally, this novel magnetic silica narrostructure presents a good platform to construct multifunctional nanostructures by the well-developed composite strategy based on silica chemistry.
机译：以二甘醇（DEG）和二乙醇胺（DEA）为溶剂和络合剂，通过高温分解中间体络合化合物，成功地利用一种轻松的溶剂热方法合成了良好结晶的磁铁矿（Fe3O4）纳米粒子。然后是一种新颖的蛋黄状磁性二氧化硅纳米结构，由a组成。通过简便的一步式溶胶-凝胶技术成功地制备了二氧化硅核和另一种在表面嵌入磁性纳米粒子的二氧化硅壳。仔细研究了实验参数以优化制备过程。通过使用容易获得的具有不同直径的二氧化硅胶体核，可以在宽范围内有效地调节最终产品的直径。可以通过改变原硅酸四乙酯（TEOS）的添加量来控制壳的厚度。在表征的基础上，我们提出了纳米结构的形成机理。酸溶液的预添加在该过程中起着关键作用，从而增强了磁性纳米颗粒和二氧化硅球形核之间的静电吸引力。由于提供了二氧化硅珠子的磁性，因此发现了一些由磁引力引起的聚集，应进一步改善。该策略提供了将磁性纳米颗粒整合到二氧化硅基质中的简便方法。此外，这种新颖的磁性二氧化硅纳米结构提供了一个良好的平台，可以通过基于二氧化硅化学的发达的复合策略来构建多功能纳米结构。

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