Role of micro-concentration field on morphology of silver particles

被引：0
|
作者：
Xu Y. [1 ,2 ]
Chen D. [3 ]
Sun D. [3 ]
Li J. [4 ]
Han Y. [1 ,2 ]
机构：
[1] State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
[2] School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing
[3] School of Mechanical Engineering, Southeast University, Nanjing
[4] Yanshan Branch of Sinopec Beijing Research Institute of Chemical Industry, Beijing
来源：
Han, Yongsheng (yshan@ipe.ac.cn) | 1600年 / Materials China卷 / 71期
关键词：
Concentration gradient; Dynamic growth; In-situ investigation; Micro-concentration field; Morphology evolution; Silver particle;
D O I：
10.11949/0438-1157.20200090
中图分类号：
学科分类号：
摘要：
To reveal the role of interface micro-concentration distribution on the evolution of materials structure, silver crystallization was investigated by the in-situ optical microscopy and lattice Boltzmann simulations. Silver particles were synthesized by electrodeposition, in which silver oxide colloid particles were generated as the by-products. The migration velocity of colloid particles in the electrolyte was regulated by the electric field. With the increase of migration velocity of colloid particle, mass transfer increased, the diffusion layer in the front of the growth became thinner, and the concentration gradient became sharper. As a result, the morphology of silver particles changed from spherical nanocrystals to symmetrical dendrites, and the growth rate increased from 10 μm2/s to 60 μm2/s simultaneously. Finally, it was proposed that the micro-concentration field in the diffusion layer is the main mechanism dominating the evolution of particle morphology, which was verified by the lattice Boltzmann simulation of convection diffusion and phase transition. © 2020, Editorial Board of CIESC Journal. All right reserved.
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页码：281 / 288
页数：7
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