The growth of carbon coating layers on iron particles and the effect of alloying the iron with silicon

Tokoro, Hisato; Fujii, Satoshi; Kobayashi, Yasuhiro; Muto, Shunsuke

doi:10.1016/j.jallcom.2010.10.124

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…The observed value of magnetic field strength if typical for alloys with less than 15% of iron [32]. Subspectra 3 and 4 (table 2) of this sample correspond to the solid solution of silicon in metallic iron [33]. The increase of the isomer shift relative to pure α-Fe and decrease if the magnetic field strength correspond to iron atoms in different surrounding [34].…”

Section: Accepted Manuscriptmentioning

confidence: 83%

Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Yurkov

Shashkeev

Kondrashov

et al. 2016

Journal of Alloys and Compounds

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Section: Accepted Manuscriptmentioning

confidence: 83%

Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Yurkov

Shashkeev

Kondrashov

et al. 2016

Journal of Alloys and Compounds

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“…It was composed of an amorphous iron doubly coated with carbon, the inner layer of which was graphitic and the outer layer of which was amorphous (Figure d–f). Also in 2011, a study demonstrated that adding SiC to the iron oxide precursor of carbon-coated metallic iron particles formed by annealing iron oxide and carbon powder in nitrogen at 1400 °C leads to the replacement of FeC from the core surface with an FeSi alloy, insinuating along the way the greater affinity of the earthicle’s core to silicon than carbon . In 2012, the use of carbon-coated iron particles as mobile extraction agents in filtration technologies assisted with permanent magnets, allowing the extraction on ton per hour scales, was first reported .…”

Section: Biphasic Carbon-coated Iron (Oxide) Compositionsmentioning

confidence: 99%

“…Also in 2011, a study demonstrated that adding SiC to the iron oxide precursor of carbon-coated metallic iron particles formed by annealing iron oxide and carbon powder in nitrogen at 1400 °C leads to the replacement of FeC from the core surface with an FeSi alloy, insinuating along the way the greater affinity of the earthicle's core to silicon than carbon. 217 In 2012, the use of carbon-coated iron particles as mobile extraction agents in filtration technologies assisted with permanent magnets, allowing the extraction on ton per hour scales, was first reported. 218 In the same year, a method was developed for the electron beam irradiation induced transformation of an amorphous carbon coating around iron oxide nanoparticles to only a few orderly layers of graphene thick one, along with thermal annealing to convert multivalent iron oxide to zerovalent iron.…”

Section: Biphasic Carbon-coated Iron (Oxide) Compositionsmentioning

confidence: 99%

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Uskoković

2020

ACS Earth Space Chem.

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Earthicle was conceived as an astromimetic particle mimicking the stratified structure of Earth. Although earthicle can come in various compositional and structural forms, its seminal version consisted of a spherical nanoparticle with an iron core, a silica shell, and a carbon crust. This study provides a historical review of composite, core/shell particles composed of four different combinations of phases present in this original version of the earthicle, three of which are biphasic and one of which is triphasic: iron(oxide)/silica, iron(oxide)/carbon, silica/carbon, and iron(oxide)/silica/carbon. The connection of all four types of particles to materials of astrophysical origin found in interstellar and interplanetary space is discussed. The referred studies on the three biphasic compositions were selected on the basis of their conceptual and methodological innovativeness or originality in terms of the analytical data. In contrast, all studies that have reported so far on the synthesis, characterization, or application of the hybrid particles with the triphasic composition, along with a number of related studies, are reviewed. The chronological perspective adopted for both types of hybrid compositions, biphasic and triphasic, allowed for the deduction of past and present trends in the research of these composite systems but also for the extrapolation of probable future trends. For example, the interest in silica-coated iron (oxides) has been greater than that in other three core/shell systems, especially in biomedical studies, one reason being the difference in reactivity and in the favored oxidation state of the magnetic core under silica and under carbon. The early focus of research on silica-coated iron (oxides) was mostly on controlling the synthesis process, but as of the early 2000s the interest in controlling the properties and devising new applications for these systems became dominant among the scientific community. Carbon-coated silica particles have been the least studied and have had the least impact among the three biphasic combinations reviewed, especially in the biomedical field where their research has been virtually none. Revived briefly around 2010, the interest in them wound down soon thereafter in favor of more complex compositions. Still, the most complex hybrid composition reviewed here, comprising iron (oxide) particles shelled doubly, first with silica and then with carbon, was the least studied of all four multiphasic compositions elaborated here. However, unlike the ups and downs in the research on the biphasic compositions in the particulate form, the corresponding interest in these triphasic particles has been continually increasing, in spite of the comparatively low number of literature reports on them. This promising trend emerging from the literature search may go hand-in-hand with the ongoing global tendency to fabricate complex composite particle structures in search of novel properties arising from the sometimes theoretically predictable and sometimes serendipitous synergies be...

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Carbo-Iron®—Synthesis and stabilization of Fe(0)-doped colloidal activated carbon for in situ groundwater treatment

Bleyl

Kopinke

Mackenzie

2012

Chemical Engineering Journal

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The growth of carbon coating layers on iron particles and the effect of alloying the iron with silicon

Cited by 8 publications

References 20 publications

Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Synthesis and magnetic properties of cobalt ferrite nanoparticles in polycarbosilane ceramic matrix

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Carbo-Iron®—Synthesis and stabilization of Fe(0)-doped colloidal activated carbon for in situ groundwater treatment

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