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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Preparation of solid nickel nanoparticles by large-scale spray pyrolysis of Ni(NO_3)_2·6H_2O precursor: Effect of temperature and nickel acetate on the particle morphology
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Preparation of solid nickel nanoparticles by large-scale spray pyrolysis of Ni(NO_3)_2·6H_2O precursor: Effect of temperature and nickel acetate on the particle morphology

机译：Ni（NO_3）_2·6H_2O前体的大规模喷雾热解制备固体镍纳米粒子：温度和乙酸镍对粒子形态的影响

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Spherical nickel nanoparticles were prepared by a large-scale spray pyrolysis process with two continuous reactors and were investigated in terms of particle-formation mechanism, surface property, particle shape, and size with changing the temperature of two continuous reactors and the type of precursor. When nickel nitrate was used as a precursor and the second reactor temperature was over 1200℃, solid Ni particles were obtained, but many ultra-fine particles of less than tens nanometer were simultaneously formed via a gas-to-particle conversion mechanism. The formation of such ultra-fine particles was reduced by making hollow particles in the first reactor at 500℃ and thereafter densifying them in the second reactor at 1400℃, but could not completely prevent. The addition of about 5-10 mol% nickel acetate instead nitrate precursor was found to be very effective to avoid the formation of such ultra-fine particles as well as producing solid particles with clean and smooth surface. On the basis of the results obtained, a mechanism of particle formation in the large-scale spray pyrolysis was proposed. Finally, spherical and solid nickel nanoparticles, which had clean surface and high density (larger than 8.4g/cm~3), were prepared from the mixed precursor (nitrate/acetate) at a residence time of about 3 s without any chemical additive.
机译：通过两个连续反应器的大规模喷雾热解工艺制备了球形镍纳米粒子，并通过改变两个连续反应器的温度和前驱体的类型对颗粒状镍形成机理，表面性质，颗粒形状和尺寸进行了研究。当以硝酸镍为前驱体，且第二反应器温度超过1200℃时，获得了固体Ni颗粒，但同时通过气体-颗粒转化机制同时形成了许多小于数十纳米的超细颗粒。通过在第一个反应器中于500℃下制备空心颗粒，然后在1400℃的第二个反应器中将它们致密化，可以减少这种超细颗粒的形成，但不能完全防止。发现添加约5-10mol％的乙酸镍代替硝酸盐前体非常有效地避免了形成这种超细颗粒以及产生具有清洁和光滑表面的固体颗粒。根据获得的结果，提出了大规模喷雾热解过程中颗粒形成的机理。最后，由混合前驱体（硝酸盐/乙酸盐）在约3 s的停留时间下，制备了具有清洁表面和高密度（大于8.4g / cm〜3）的球形和固态镍纳米粒子，而无任何化学添加剂。

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