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Crystals 2016, 6(11), 156; doi:10.3390/cryst6110156

Controllable Hydrothermal Conversion from Ni-Co-Mn Carbonate Nanoparticles to Microspheres

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Academic Editor: Monica Distaso
Received: 2 October 2016 / Revised: 17 November 2016 / Accepted: 18 November 2016 / Published: 23 November 2016
(This article belongs to the Special Issue Mesocrystals and Hierarchical Structures)
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Abstract

Starting from Ni-Co-Mn carbonate nanoparticles prepared by microreaction technology, uniform spherical particles of Ni1/3Co1/3Mn1/3CO3 with a size of 3–4 μm were obtained by a controllable hydrothermal conversion with the addition of (NH4)2CO3. Based on characterizations on the evolution of morphology and composition with hydrothermal treatment time, we clarified the mechanism of this novel method as a dissolution-recrystallization process, as well as the effects of (NH4)2CO3 concentration on the morphology and composition of particles. By changing concentrations and the ratio of the starting materials for nano-precipitation preparation, we achieved monotonic regulation on the size of the spherical particles, and the synthesis of Ni0.4Co0.2Mn0.4CO3 and Ni0.5Co0.2Mn0.3CO3, respectively. In addition, the spherical particles with a core-shell structure were preliminarily verified to be available by introducing nano-precipitates with different compositions in the hydrothermal treatment in sequence. View Full-Text
Keywords: Ni-Co-Mn carbonate; nanoparticle; spherical particle; microreaction technology; hydrothermal treatment Ni-Co-Mn carbonate; nanoparticle; spherical particle; microreaction technology; hydrothermal treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tang, Y.; Lu, Y.; Luo, G. Controllable Hydrothermal Conversion from Ni-Co-Mn Carbonate Nanoparticles to Microspheres. Crystals 2016, 6, 156.

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