| Template growth mechanism of spherical Ni（OH）2 |
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| 引用本文： | 彭美勋,沈湘黔.Template growth mechanism of spherical Ni（OH）2[J].中南工业大学学报(英文版),2007,14(3):310-314. |
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| 作者姓名： | 彭美勋 沈湘黔 |
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| 作者单位： | [1]School of Geoscience and Environmental Engineering, Central South University, Changsha 410083, China [2]Changsha Research Institute of Mineral and Metallurgy, Changsha 410012, China [3]College of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| 基金项目： | 国家自然科学基金;中南大学校科研和教改项目 |
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| 摘 要： | The microstructures and growth process characteristics precipitation-crystallization method were investigated by SEM, TEM of spherical Ni（OH）2 particles synthesized by the aqueous and XRD, and their growth mechanism was discussed. With the reaction beginning and continuing, amorphous Ni（OH）2 nano-crystallites grow up to spherical micron-particles with radially arranged crystallites. The nucleation, crystallization and re-crystallization led by Ostwald ripening simultaneously take place through the whole growth processes. With the course from reversible aggregation to irreversible agglomeration, the Ni（OH）2 particles tend to grow according to the template growth model： the growth on the crystallite templates stretching in the radius directions is free and quick, while the growth rate for crystallites in other directions is confined due to lower monomers concentration and tends to dissolve So it is only the radially arranged crystallites that predominate in the particle and lead to characteristic microstructures.
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| 关 键 词： | 显微结构 奥斯特瓦尔德熟成 生长机制 结晶化 钠 |
| 收稿时间： | 24 October 2006 |
| 修稿时间： | 2006-10-242006-12-27 |
Template growth mechanism of spherical Ni(OH)2 |
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| Peng Mei-xun,and Shen Xiang-qian.Template growth mechanism of spherical Ni(OH)2[J].Journal of Central South University of Technology,2007,14(3):310-314. |
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| Authors: | Peng Mei-xun and Shen Xiang-qian |
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| Affiliation: | 1. School of Geoscience and Environmental Engineering, Central South University, Changsha 410083, China; 2. Changsha Research Institute of Mineral and Metallurgy, Changsha 410012, China; 3. College of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | The microstructures and growth process characteristics of spherical Ni(OH)2 particles synthesized by the aqueous precipitation-crystallization method were investigated by SEM, TEM and XRD, and their growth mechanism was discussed. With the reaction beginning and continuing, amorphous Ni(OH)2 nano-crystallites grow up to spherical micron-particles with radially arranged crystallites. The nucleation, crystallization and re-crystallization led by Ostwald ripening simultaneously take place through the whole growth processes. With the course from reversible aggregation to irreversible agglomeration, the Ni(OH)2 particles tend to grow according to the template growth model: the growth on the crystallite templates stretching in the radius directions is free and quick, while the growth rate for crystallites in other directions is confined due to lower monomers concentration and tends to dissolve. So it is only the radially arranged crystallites that predominate in the particle and lead to characteristic microstructures. |
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| Keywords: | spherical Ni(OH)2 microstructure Ostwald ripening growth mechanism crystallization |
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