Effect of Nanostructure on the Thermal Oxidation of Atomized Iron
Effect of Nanostructure on the Thermal Oxidation of Atomized Iron
复制标题
纳米结构对雾化铁热氧化的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Santhanam
中科院分区：
文献类型：
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作者：
Mohit Kumar;Naveen Rawat;K. Santhanam
摘要研究了纳米结构对雾化铁热氧化的影响。高于500 ° C时，雾化铁在空气中被氧化.然而，当铁与多壁碳纳米管（MWCNT）一起压实时，这种氧化作用被转移了100摄氏度以上。铁被纳米结构环境保护。在这项研究中，已经检查了大量的铁和多壁碳纳米管的原子比的组合物，以详细了解效果。铁的热氧化过程中的纳米结构效应被解释为由于铁原子经历了广泛的重叠和限制效应，导致自旋转移。根据文献中报道的理论计算，铁的这种约束效应被认为是产生从3d 64 s2到3d 84 s 0的有效组态的转变，从而产生自旋电子学效应。关键词：多壁碳纳米管，雾化铁，热重分析，热氧化介绍过渡金属与碳的相互作用一直感兴趣，在最近的时间，并已在理论上研究使用密度函数计算（1-6）。理解这种相互作用对于合成具有纳米结构的新材料具有重要意义。对于碳纳米管，这种相互作用可以通过两种方式来考虑;一种方式是铁原子与管的外表面相互作用，这取决于构型几何形状。在这种情况下，
Abstract The effect of nanostructure on the thermal oxidation of atomized iron has been investigated. Above 500 o C atomized iron is oxidized in the presence of air. However, when iron is compacted with multiwalled carbon nanotubes (MWCNT) this oxidation is shifted by more than 100 o C. Iron is protected by the nanostructure environment A large number of compositions of atomic ratios of iron and MWCNT have been examined in this study to understand the effect in detail. The effect of nanostructure in the thermal oxidation of iron is interpreted as due to iron atom experiencing extensive overlap and confinement effect causing spin transfer. Based on the theoretical calculations reported in the literature this confinement effect of iron is suggested to produce a transformation from 3d 6 4s 2 to an effective configuration of 3d 8 4s 0 producing spintronics effect. Key words : Multiwalled carbon nanotubes, atomized iron, thermogravimetric analysis, thermal oxidation INTRODUCTION The interaction of transition metals with carbon has been of interest in recent times and has been theoretically studied using density function calculations (1-6). An understanding of the interaction is of importance in synthesizing new materials having nanostructures. With carbon nanotubes this interaction can be considered in two ways; in one way iron atom as interacting with the outside surface of the tube that is dependent on configurational geometry. In this case an effective configuration of 3d