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首页> 外文期刊>Chemistry: A European journal >Morphological Transformation of Co(OH)(2) Microspheres from Solid to Flowerlike Hollow Core-Shell Structures
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Morphological Transformation of Co(OH)(2) Microspheres from Solid to Flowerlike Hollow Core-Shell Structures

机译：Co（OH）（2）微球从固体到花状空心核壳结构的形态转化

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摘要

We report, for the first time, a detailed investigation into the formation of highly uniform, 3D, flowerlike, hollow, spherical architectures of cobalt hydroxide through a facile solvothermal process. Various controlling parameters were examined, such as water content in starting materials, reaction time, cobalt(II) precursor concentration, and reaction temperature. On the basis of the experimental results, the formation mechanism of these flowerlike cobalt hydroxide hollow spheres involves aggregation of cobalt hydroxide building clusters into solid spheres and hollowing effect through subsequent dissolution, diffusion, and re-deposition of the smaller crystallites under the surface layer driven by an Ostwald ripening process. Metallic cobalt hollow spheres have also been obtained by thermal decomposition of cobalt hydroxide flowers in a mixed gas of Ar+4% H-2 at 400 degrees C. The morphology and composition of the products were characterized by Xray diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and (high resolution) transmission electron microscopy.
机译：我们首次报告了通过简便的溶剂热过程对高度均匀的3D，花状，空心球形氢氧化钴结构的形成进行的详细研究。检查了各种控制参数，例如起始原料中的水含量，反应时间，钴（II）前体浓度和反应温度。根据实验结果，这些花状氢氧化钴空心球的形成机理包括将氢氧化钴建筑团簇聚集成固体球，并通过随后在表面层驱动下溶解，扩散和再沉积较小的微晶而产生空心效应。通过奥斯特瓦尔德（Ostwald）成熟过程。金属钴空心球也可以通过在400摄氏度的Ar + 4％H-2混合气体中将氢氧化钴花热分解而获得。产品的形貌和组成通过X射线衍射，场发射扫描电子进行表征显微镜，能量色散X射线光谱和（高分辨率）透射电子显微镜。

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