Onion-like nanoparticles with γ-Fe core surrounded by a α-Fe/Fe-oxide double shell

Fernández-García, M. P.; Gorría, P.; Sevilla, Marta; Fuertes, Antonio B.; Grenèche, Jean‐Marc; Blanco, J.A.

doi:10.1016/j.jallcom.2010.12.206

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…In both cases, we found that the Fe or Co NPs generated dissolved under acid washing showing that they were unprotected. 23,33,42,43 From the present results, it seems that Ni has a special ability to associate with the carbon generated from sucrose, thus providing an effective protection against aerial oxidation. However, this issue deserves further investigation.…”

Section: ' Results and Discussionmentioning

confidence: 64%

Enhanced Protection of Carbon-Encapsulated Magnetic Nickel Nanoparticles through a Sucrose-Based Synthetic Strategy

et al. 2011

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We report an easy synthesis strategy for the incorporation of carbon-coated Ni nanoparticles within the pores of a highly porous carbon matrix. An advantageous feature of this process is that it is able to provide large amounts of magnetic Ni composite by means of an easy-to-follow one-pot reaction. While a typical chemical route based on a conventional pyrolysis procedure gives rise to NPs with Ni@NiO (core@shell structure), the addition of sucrose to the synthesis mixture and its subsequent transformation to carbon endows the Ni-NPs with an effective protection via the formation of a thin carbon layer around the metallic nanoparticles. This protective shell stabilizes the inserted metallic particles by preventing the aerial oxidation of Ni-NPs (i.e., NiO) and their dissolution in an aqueous acid environment. The macroscopic magnetization values of these nanocomposites (up to 6 emu/g) and their superparamagnetic behavior at room temperature allow them to be easily manipulated with conventional magnets. This makes them ideal candidates for use in applications that involve magnetic separation (i.e., heterogeneous catalysis, adsorption of contaminants in aqueous media, etc.).

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Section: ' Results and Discussionmentioning

confidence: 64%

Enhanced Protection of Carbon-Encapsulated Magnetic Nickel Nanoparticles through a Sucrose-Based Synthetic Strategy

et al. 2011

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“…Although there has been some research on EB in granular materials in the last decades [7][8][9][10][11][12], but the majority of research has focused mainly on thin film systems [13][14][15][16][17]. This is mostly because the spin distribution in granular systems particularly core-shell NPs are essentially more intricate than that of thin films.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and ageing effect in FeO nanoparticles: Transformation to core–shell FeO/Fe3O4 and their magnetic characterization

Sharma

Vargas

Pirota

et al. 2011

Journal of Alloys and Compounds

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“…There are works in which an oxygen-containing layer of iron was found. Iron nanoparticles embedded in an activated carbon matrix were synthesized in [ 21 ] by a pyrolysis process. The investigated structure exhibits an onion-like morphology that consists of a γ– Fe core surrounded by a double α– Fe (inner)/γ– Fe 2 O 3 (outer) shell.…”

Section: Resultsmentioning

confidence: 99%

Competitive Formation Zones in Carbon Nanotube Float-Catalysis Synthesis: Growth in Length vs. Growth Suppression

et al. 2022

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Catalytic synthesis of carbon nanotubes (CNT) produces numerous various byproducts such as soot, graphite platelets, catalyst nanoparticles, etc. Identification of the byproduct formation mechanisms would help develop routes to more selective synthesis of better carbon-based materials. This work reports on the identification of the formation zone and conditions for rather unusual closed multishell carbon nanocapsules in a reactor for float-catalysis synthesis of longer CNT. Structural investigation of the formed nanocapsule material along with computational fluid dynamics (CFD) simulations of the reactor suggested a nanocapsule formation mechanism, in which CNT embryos are suppressed in growth by the in-reactor turbulence. By means of TEM and FFT investigation, it is found that differently oriented single crystals of γ–Fe2O3, which do not have clear connections with each other, determine a spherical surface. The carbon atoms that seep through these joints do not form crystalline graphite layers. The resulting additional product in the form of graphene-coated (γ–Fe/Fe3C)/γ–Fe2O3 nanoparticles can be a lightweight and effective microwave absorber.

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Onion-like nanoparticles with γ-Fe core surrounded by a α-Fe/Fe-oxide double shell

Cited by 9 publications

References 23 publications

Enhanced Protection of Carbon-Encapsulated Magnetic Nickel Nanoparticles through a Sucrose-Based Synthetic Strategy

Enhanced Protection of Carbon-Encapsulated Magnetic Nickel Nanoparticles through a Sucrose-Based Synthetic Strategy

Synthesis and ageing effect in FeO nanoparticles: Transformation to core–shell FeO/Fe3O4 and their magnetic characterization

Competitive Formation Zones in Carbon Nanotube Float-Catalysis Synthesis: Growth in Length vs. Growth Suppression

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