The origin of hematite nanowire growth during the thermal oxidation of iron

Yuan, Lü; Wang, Yiqian; Cai, Rongsheng; Jiang, Qike; Wang, Jianbo; Li, Boquan; Sharma, Anju; Zhou, Guangwen

doi:10.1016/j.mseb.2011.12.034

Cited by 120 publications

(114 citation statements)

References 39 publications

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“…al. 26 have observed the formation of a layered sequence of Fe/Fe 3 O 4 /Fe 2 O 3 on a thin film, followed by hematite nanowire growth on the outer layer. In order to further characterize the structure and morphology of magnetic microtubes, microRaman spectroscopy measurements have been performed (Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of magnetic microtubes decorated with nanowires and cells

et al. 2018

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ARTICLES YOU MAY BE INTERESTED INStudy on the mechanism of a manganese-based catalyst for catalytic NO X flue gas denitration AIP Advances 8, 045004 (2018); https://doi.org/10.1063/1.4989431The effect of surface wettability on the performance of a piezoelectric membrane pump AIP Advances 8, 045010 (2018) Antiferromagnetic and ferrimagnetic microtubes decorated with nanowires have been obtained during thermal oxidation process, which was assisted by in situ electrical resistivity measurements. The synthesis route including heat treatment and electrical current along with growth mechanism are presented. This simple method and the ability to tune in the magnetic moment of the obtained microtubes going from a nonmagnetic-like to a large magnetization saturation open an avenue for interesting applications. In vitro experiments involving adherence, migration, and proliferation of fibroblasts cell culture on the surface of the microtubes indicated the absence of cytotoxicity for this material. We have also calculated both torque and driving magnetic force for these microtubes with nanowires and cells as a function of external magnetic field gradient which were found to be robust opening the possibility for magnetic bio micro-robot device fabrication and application in biotechnology.

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Section: Resultsmentioning

confidence: 99%

Synthesis of magnetic microtubes decorated with nanowires and cells

et al. 2018

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“…The outward movement of Fe is believed to correlate with the formation of w€ ustite and magnetite structures, whereas inward diffusion of O atoms forms the hematite local structure on the free surface. 49 Consequently, after the oxidation process is completed, the average diameter of the pure Fe NW significantly increases, from r ¼ 25.00 Å to r ¼ 28.00 Å , which has a great impact on the nanowire roughness and internal structure. The oxide shell layer on the Fe crystalline NW material surface produces large interfacial regions per unit volume and radial length, as expected.…”

Section: A Dynamic Of Oxide Growth Processesmentioning

confidence: 99%

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Aral

Wang

Ogata

et al. 2016

Journal of Applied Physics

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The influence of oxidation on the mechanical properties of nanostructured metals is rarely explored and remains poorly understood. To address this knowledge gap, in this work, we systematically investigate the mechanical properties and changes in the metallic iron (Fe) nanowires (NWs) under various atmospheric conditions of ambient dry O 2 and in a vacuum. More specifically, we focus on the effect of oxide shell layer thickness over Fe NW surfaces at room temperature. We use molecular dynamics (MD) simulations with the variable charge ReaxFF force field potential model that dynamically handles charge variation among atoms as well as breaking and forming of the chemical bonds associated with the oxidation reaction. The ReaxFF potential model allows us to study large length scale mechanical atomistic deformation processes under the tensile strain deformation process, coupled with quantum mechanically accurate descriptions of chemical reactions. To study the influence of an oxide layer, three oxide shell layer thicknesses of $4.81 Å , $5.33 Å , and $6.57 Å are formed on the pure Fe NW free surfaces. It is observed that the increase in the oxide layer thickness on the Fe NW surface reduces both the yield stress and the critical strain. We further note that the tensile mechanical deformation behaviors of Fe NWs are dependent on the presence of surface oxidation, which lowers the onset of plastic deformation. Our MD simulations show that twinning is of significant importance in the mechanical behavior of the pure and oxide-coated Fe NWs; however, twin nucleation occurs at a lower strain level when Fe NWs are coated with thicker oxide layers. The increase in the oxide shell layer thickness also reduces the external stress required to initiate plastic deformation. Published by AIP Publishing.

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“…Previous work by Higginson et al 22 on whisker growth morphology of high temperature oxides showed these whiskers are highly likely to be hematite. Yuan et al 23 found iron whisker growth often occurs on the grain boundaries of hematite/magnetite whereas Higginson et al 22 and Pettersson et al 18 found that whiskers were most likely to form around areas of breakaway oxidation. It is beyond the scope of the current work to speculate on the formation mechanism of the whiskers.…”

Section: Hematitementioning

confidence: 99%