Synthesis of Needle-like Nickel Powder by Thermal Decomposition of Nickel Oxalate
Synthesis of Needle-like Nickel Powder by Thermal Decomposition of Nickel Oxalate
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DOI：
10.2473/shigentosozai.121.255
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. Okamoto;R. Ichino;M. Okido;Zhihong Liu;Chuanfu Zhang
中科院分区：
文献类型：
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作者：
T. Okamoto;R. Ichino;M. Okido;Zhihong Liu;Chuanfu Zhang
以草酸氨合镍为前驱体，采用热分解法制备了高长径比针状镍粉。c.a.的镍前体通过将两种溶液同时滴入pH 9.5的蒸馏水中，获得长度为1 μm，宽度为50 nm的样品。一种是含有六水合氯化镍和氨的溶液，另一种是草酸钠溶液。随着pH值的升高，颗粒形貌由粒状向针状转变，在363 K时，得到了尺寸较大、分散性较好的针状颗粒。金属镍颗粒的形状从613 K的针状转变为673 K的链状，这取决于镍前驱体的热处理温度。
Needle-like nickel powder with high aspect ratio was synthesized by the thermal decomposition of the precursors consisting of nickel ammine oxalate precipitated from aqueous solution. Nickel precursors of c.a. 1 μm in length and 50 nm in width were obtained by falling two solutions in drops simultaneously into distilled water at pH 9.5. One is a solution containing nickel chloride hexahydrate and ammonia, and the other is a sodium oxalate solution. The morphology of particles changed from granular to needle-like with the increase in pH. Large and size-dispersed needle-like particles were obtained at 363 K. The shape of metallic nickel particles changed from needle-like at 613 K to chain-like at 673 K depending on the heating treatment temperature of nickel precursors.