Nanocasting of Superparamagnetic Iron Oxide Films with Ordered Mesoporosity,Advanced Materials Interfaces

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Nanocasting of Superparamagnetic Iron Oxide Films with Ordered Mesoporosity
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2017-12-27 , DOI: 10.1002/admi.201700960
Katrin Kraffert ₁ , Anke Kabelitz _{2,

3} , Konrad Siemensmeyer ₄ , Roman Schmack ₁ , Denis Bernsmeier ₁ , Franziska Emmerling ₂ , Ralph Kraehnert ₁

Affiliation

Maghemite and magnetite show superparamagnetic behavior when synthesized in a nanostructured form. The material's inducible magnetization enables applications ranging from contrast enhancing agents for magnetic resonance imaging to drug delivery systems, magnetic hyperthermia, and separation. Superparamagnetic iron oxides with templated porosity have been synthesized so far only in the form of hard‐templated powders, where silicon retained from the template severely degrades the material's magnetic properties. Here, for the first time, the synthesis of superparamagnetic iron oxides with soft‐templated mesopore structure is reported. The synthesis of nanostructured maghemite and magnetite films succeeds using micelles of amphiphilic block‐copolymers as templates. A thermal treatment of the initially formed mesoporous ferrihydrite in nitrogen produces maghemite, which can be partly reduced to magnetite via thermal treatment in hydrogen while retaining the templated mesopore structure. The resulting materials feature a unique combination of high surface area, controlled pore diameter, and tunable magnetic properties.

中文翻译：

有序介孔的超顺磁性氧化铁薄膜的纳米铸造

当以纳米结构形式合成时，磁赤铁矿和磁铁矿表现出超顺磁行为。该材料的感应磁化强度使得其应用范围从用于磁共振成像的对比增强剂到药物输送系统，磁热疗和分离。到目前为止，仅以硬模板粉末的形式合成了具有模板孔隙率的超顺磁性氧化铁，其中从模板保留的硅会严重降低材料的磁性能。在这里，首次报道了具有软模板介孔结构的超顺磁性氧化铁的合成。纳米结构磁赤铁矿和磁铁矿薄膜的合成成功地使用了两亲性嵌段共聚物的胶束作为模板。在氮气中对最初形成的中孔亚铁水合物进行热处理会产生磁赤铁矿，磁赤铁矿可以通过在氢气中进行热处理而部分还原成磁铁矿，同时保留模板化的中孔结构。所得材料具有高表面积，受控孔径和可调磁性能的独特组合。

更新日期：2017-12-27

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