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A Chemical Route to Large‐Scale Preparation of Spherical and Monodisperse Ni Powders
Author(s) -
Choi JaeYoung,
Lee YongKyun,
Yoon SeonMi,
Lee Hyun Chul,
Kim ByungKi,
Kim Jong Min,
Kim KangMin,
Lee JongHeun
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00582.x
Subject(s) - exothermic reaction , dispersity , decomposition , materials science , chemical engineering , spheres , reducing agent , chemical reaction , thermal decomposition , chemical reduction , chemistry , organic chemistry , polymer chemistry , physics , astronomy , engineering , electrode , electrochemistry
A facile chemical route to prepare a well‐defined Ni powder on a mass‐production scale without external heating was suggested. A highly concentrated Ni complex was formed between NiCl 2 and N 2 H 4 solution, and subsequent addition of NaOH solution triggered serial reactions from the Ni complex decomposition via Ni(OH) 2 formation to the reduction of a Ni(OH) 2 gel into well‐defined Ni spheres. The high temperature necessary for the reaction was attained not by external heating but by exothermic reactions such as complex formation and reduction. The preparation of monodisperse and spherical Ni powder was attributed to uniform distribution of the reducing agent (N 2 H 4 ) within the Ni(OH) 2 gel.