Gaseous Detonation Synthesis of Carbon-Encapsulated Iron Nanoparticles
doi: 10.11858/gywlxb.2016.03.005
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摘要: 以粉末状与气态二茂铁为原料,以氢气和氧气混合气体为爆轰能源,采用气相爆轰法进行了合成碳包覆铁纳米颗粒实验。 XRD和TEM实验结果表明,采用两种不同状态的二茂铁,均得到了纳米碳包覆铁颗粒。 该包覆颗粒的组成核为铁或铁碳化合物,外层壳主要由石墨碳组成,大部分球形纳米颗粒尺寸分布于5~30nm 之间。 通过对比发现,采用气态二茂铁爆轰时,所得到的碳包铁粒度分布较为集中,壳层厚度比较均匀,且粒子具有较好的球形状。最后结合铁碳合金相图,从热处理角度对气相爆轰合成碳包覆铁纳米颗粒的机理进行了分析,得出产物中α-Fe与Fe3C的形成过程。 分析了碳包覆铁纳米颗粒的磁滞回线,其表现出硬磁性与顺磁性双重性质。Abstract: Carbon-encapsulated iron nanoparticles were formed using a gaseous detonation method in a mixture of hydrogen and oxygen in which the powder and gaseous forms of ferrocene were used as the raw materials.X-ray diffraction and transmission electron microscopy analysis shows that using either of the two different states of ferrocene yields carbon-encapsulated iron nanoparticles.The encapsulated particles were composed of iron or iron-carbon compounds as the core, and the outer shell was mainly composed of graphitic carbon.The sizes of most spherical nanoparticles varied between 5 and 30 nm.When using gaseous ferrocene in the detonation, the particle size distribution was narrower, the thickness of the shell layer was more uniform, and the particles had a higher sphericity.Using the iron-carbon alloy phase diagram, an analysis of the mechanism for gaseous detonation synthesis of carbon-encapsulated iron nanoparticles was carried out.The magnetic hysteresis loops of carbon-encapsulated iron nanoparticles were analyzed, which exhibit the dual natures of hard magnetic and paramagnetic.
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Key words:
- nanoparticles /
- gaseous detonation /
- carbon-encapsulated Iron /
- X-ray diffraction /
- TEM
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Table 1. Molar amount of each atom before and after the reaction
Time H/(mol) O/(mol) C/(mol) Fe/(mol) Before reaction 0.536 0.348 0.188 0.018 8 After reaction 0 0 0.180 0.018 8 
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Table 2. Magnetic analysis of the samples
No. Ms/(A·m2/kg) Mr/(A·m2/kg) Hc/[(250/π)A/m] Mr/Ms 1 84.70 8.22 142 0.097
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