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以纯度为99.9%的镁粉为原料,采用惰性气体冷凝法来制备镁纳米颗粒,研究了蒸发温度及沉积位置对镁纳米颗粒形貌和尺寸的影响。结果表明,蒸发温度为600℃时,在冷阱最前端得到了直径为10~50 nm的镁纳米颗粒,纳米颗粒之间相互连接呈链状形态,并且在镁纳米颗粒之间发现了镁纳米线。结果还表明,随着蒸发温度升高,得到的镁纳米颗粒尺寸增大;随着沉积位置的变化,其镁纳米颗粒尺寸也发生规律性变化。根据气/固相变理论及机制,对镁纳米颗粒的形成过程进行了解释,提出了相应的镁纳米颗粒的形成模型。
The purity of 99.9% magnesium powder as raw material, the use of inert gas condensation method to prepare magnesium nanoparticles, the evaporation temperature and deposition location of magnesium nanoparticles morphology and size. The results show that when the evaporation temperature is 600 ℃, magnesium nanoparticles with the diameter of 10 ~ 50 nm are obtained at the front of the cold trap, and the nanoparticles are connected with each other in a chain form, and between the magnesium nanoparticles, magnesium nano line. The results also show that with the evaporation temperature increases, the size of the obtained magnesium nanoparticles increases; as the deposition location changes, the size of the magnesium nanoparticles also changes regularly. According to the gas / solid phase change theory and mechanism, the formation process of magnesium nanoparticles is explained, and the corresponding formation model of magnesium nanoparticles is proposed.