Preparation of Iron Fine Particles Coated with Boron Nitride Layers

Tokoro, Hisato; Fujii, Satoshi; Oku, Takeo; Segi, Takashi; Nasu, Saburo

doi:10.2320/matertrans.45.2941

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…19 For multilayer h-BN grown on Fe 2 B alloy, N 2 would rstly decompose into active nitrogen atoms with the catalysis of Fe 2 B substrate. 27 Then, active nitrogen atoms would react with Fe 2 B to form initial B-N molecular. 18,27 High concentration B-N molecules would segregate and induce the nucleation of h-BN isothermally.…”

Section: Resultsmentioning

confidence: 99%

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Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy

Shi

Yang

et al. 2019

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

“…27 Then, active nitrogen atoms would react with Fe 2 B to form initial B-N molecular. 18,27 High concentration B-N molecules would segregate and induce the nucleation of h-BN isothermally. Finally, h-BN nucleus would grow and coalesce into multilayer h-BN lms on the surface of Fe 2 B alloy.…”

Section: Resultsmentioning

confidence: 99%

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy

Shi

Yang

et al. 2019

RSC Adv.

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“…The proportion of B-N bonds in the NPs deposits is significantly smaller and the partial removal observed could be consequence of the dissolution of the surrounding B-O. Tokoro et al 30 synthesized Fe NPs with a BN shell from mixed powders and reported the formation of a BN shell at 1573 K that totally prevents the oxidation of Fe cores. They claimed a catalytic effect of Fe for the BN formation.…”

Section: Resultsmentioning

confidence: 99%

Dispersion and Functionalization of Nanoparticles Synthesized by Gas Aggregation Source: Opening New Routes Toward the Fabrication of Nanoparticles for Biomedicine

et al. 2015

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The need to find new nanoparticles for biomedical applications is pushing the limits of the fabrication methods. New techniques with versatilities beyond the extended chemical routes can provide new insight in the field. In particular gas aggregation sources offer the possibility to fabricate nanoparticles with controlled size, composition and structure out of thermodynamics. In this context, the milestone is the optimization of the dispersion and functionalization processes of nanoparticles once fabricated by these routes as they are generated in the gas phase and deposited on substrates in vacuum or ultra-high vacuum conditions. In the present work we propose a fabrication route in ultra-high vacuum that is compatible with the subsequent dispersion and functionalization of nanoparticles in aqueous media and, that is more remarkable, in one single step. In particular, we will present the fabrication of nanoparticles with a sputter gas aggregation source, using a Fe 50 B 50 target, and their further dispersion and functionalization with polyethileneglycol (PEG). A characterization of these nanoparticles is carried out before and after PEG functionalization. During functionalization, significant boron dissolution occurs, which facilitates nanoparticle dispersion in the aqueous solution. The use of different complementary techniques allows us to prove the PEG attachment onto the surface of the nanoparticles creating a shell to make them biocompatible. The result is the formation of nanoparticles with a structure mainly composed by a metallic Fe core and an iron oxide shell, surrounded by a second PEG shell dispersed in aqueous solution. Relaxivitiy measurements of these PEG functionalized nanoparticles assessed their effectiveness as contrast agents for Magnetic Resonance Imaging (MRI) analysis. Therefore, this new fabrication route is a reliable alternative for the synthesis of nanoparticles for biomedicine.

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“…18,19 While two-dimensional planar substrates are widely adopted in these studies, no information pertaining to substrates of irregular shapes is reported. Early investigations on powdered substrate focus on transition metal oxides, such as magnesium oxides, 20 silver oxides, 21 iron oxides Ĳα-Fe 2 O 3 ), 22,23 and aluminum oxides. 24 None of these materials are used as catalysts.…”

Section: Introductionmentioning

confidence: 99%

Boron nitride coated rhodium black for stable production of syngas

Chien

Bokhoven

2015

Catal. Sci. Technol.

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Preparation of Iron Fine Particles Coated with Boron Nitride Layers

Cited by 5 publications

References 20 publications

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy

Dispersion and Functionalization of Nanoparticles Synthesized by Gas Aggregation Source: Opening New Routes Toward the Fabrication of Nanoparticles for Biomedicine

Boron nitride coated rhodium black for stable production of syngas

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Preparation of Iron Fine Particles Coated with Boron Nitride Layers

Cited by 5 publications

References 20 publications

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe2B alloy

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe2B alloy

Dispersion and Functionalization of Nanoparticles Synthesized by Gas Aggregation Source: Opening New Routes Toward the Fabrication of Nanoparticles for Biomedicine

Boron nitride coated rhodium black for stable production of syngas

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Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy

Controlled synthesis of uniform multilayer hexagonal boron nitride films on Fe₂B alloy