Nano-icro-architectural composites with acid properties: Magnetic iron oxides/amorphous silicate prepared from iron oxide produced by iron-oxidizing bacterium, Leptothrix ochracea
Nano-icro-architectural composites with acid properties: Magnetic iron oxides/amorphous silicate prepared from iron oxide produced by iron-oxidizing bacterium, Leptothrix ochracea
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具有酸性特性的纳米微建筑复合材料：由铁氧化细菌 Leptothrix ochracea 产生的氧化铁制备的磁性氧化铁/无定形硅酸盐
DOI：
10.1016/j.materresbull.2012.12.022
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发表时间：
2013
影响因子：
5.4
通讯作者：
H. Hashimoto
中科院分区：
文献类型：
--
作者：
S. W. Xu;K. Oh-ishi;H. Takahashi;T. Homma;S. Kamado;黒坂貴裕;渡邊真宏;渡邊真宏;渡邊真宏;森下エラ;渡邊真宏;H. Hashimoto
以氧化铁细菌细螺旋体（Leptothrix ochracea）产生的氧化铁为前驱体，制备了具有酸性功能的新型磁性复合材料。复合材料是通过热处理和随后的细菌氧化铁还原制备的。在空气中得到的α- fe2o3纳米颗粒被热还原为fe3o4，并逐渐氧化为γ-Fe2O3。fe3o4和γ-Fe2O3复合材料具有较高的磁化强度，约为纯fe3o4和γ-Fe2O3的一半。所有样品都具有有趣的纳米微建筑结构：~ 40纳米直径的晶体颗粒被~ 8纳米厚的无定形硅酸盐覆盖，它们错综复杂地相互连接成~ 1 μm直径的微管。吡啶吸附谱表明，表面无定形硅酸盐具有Brönsted和路易斯酸性质。
To develop novel magnetic composites with acid functionalities, iron oxide produced by iron-oxidizing bacterium, Leptothrix ochracea, was used as a precursor. The composites were prepared by thermal treatment and subsequent reduction of the bacterial iron oxide. α-Fe2O3nanoparticles obtained in air were thermally reduced to Fe3O4and gradually oxidized to γ-Fe2O3. The obtained composites with Fe3O4and γ-Fe2O3have high magnetization values that are approximately half those of pure Fe3O4and γ-Fe2O3. All samples have an interesting nano–micro-architectural structure: ∼40-nm-diameter crystalline particles covered with ∼8-nm-thick amorphous silicate are intricately interconnected into ∼1-μm-diameter microtubules. Pyridine adsorption spectra indicate that the surface amorphous silicate has both Brönsted and Lewis acid properties.