Magnetic stability of Al2O3-coated fcc-Co nanocapsules

Liu, X.G.; Geng, D. Y.; Liang, Jian Ping; Zhang, Z.D.

doi:10.1016/j.jallcom.2007.10.128

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…Nanocapsules have potential applications in various areas such as magnetic recording, magnetic fluids and medicine [3]. Up to now, carbon-coated metal nanocapsules have been produced by arc-discharge [4][5][6][7][8] plasma process [9,10] and chemical vapor condensation [11,12], pyrolysis of metal-carbon compounds [13,14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nickel nanocapsules and carbon nanotubes via methane CVD

Ziebro

Łukasiewicz

Grzmil

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Synthesis of nickel nanocapsules and carbon nanotubes via methane CVD

Ziebro

Łukasiewicz

Grzmil

et al. 2009

Journal of Alloys and Compounds

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“…For example, as microwave absorbing and shielding materials, their characteristics are associated with complex permeability, permittivity and electromagnetic impedance match in high frequency [2].For biomedical applications the particles should be biocompatible with low toxicity, present superparamagnetic behaviour at room temperature and be stable in liquid saline environment [3].Composites of metallic magnetic materials core with insulating materials layer have high saturation magnetization, low coercivity and high permeability to reduce the eddy loss have been investigated during recent several years. Soft magnetic composites including Ni/SnO 2 [4], Co/Al 2 O 3 [5], FeNi 3 /SiO 2 [6], FeNi 3 /(Ni 0.5 Zn 0.5 )Fe 2 O 4 [7], FeNi 3 /SiO 2 /C [8]etc., have been studied by many professionals and engineers. Among these studies, SiO 2 -coated metal alloy core have been intensively studied.…”

Section: Introductionmentioning

confidence: 99%

SiO<sub>2</sub>-Coated Fe-Ni Alloy Core–Shell Structures Synthesized by a Facile Chemical Method

Mei

Hou

2016

KEM

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Fe-Ni@ SiO2core–shell structured micrometer spherical particles with nanometer thick SiO2 shell were fabricated by a facile wet chemical process, their compositions and mechanisms were investigated using x-ray diffraction and Fourier transform of infra-red spectra, and their microstructures and magnetic properties were analyzed by high-resolution transmission electron microscopy and vibrating sample magnetometer. The structure of the synthesized SiO2-coated Fe-Ni alloy particles varied with adding TEOS contents. As-prepared Fe-Ni@SiO2 composites exhibit typical soft magnetic properties. Their highest saturation magnetization approximately linear decreases from 176 emu g−1for pure Fe-Ni alloy powders to 121 emu g−1for the coated powders with 20nm amorphous silica layers, but the coercivity of all different thickness SiO2-coated Fe-Ni alloy powders maintains in the range of about 25 Oe.

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“…These nanoparticles, have many applications in a number of fields, including use in nanoelectronic devices, molecular recognition, biomedical applications, and optical devices [1]. Recently, different nanocomposite materials, such as SiO 2coated Fe nanocapsules, cobalt ferrite core/shell nanoparticles, silver/polystyrene nanospheres, Au-Cu 2 O core-shell nanocubes, and Al 2 O 3 -Co nanocapsules have been synthesized by different fabrication methods [2][3][4][5]. One of the prevalent nanostructures that has many uses in biomedicine is the magnetic nanoparticle.…”

Section: Introductionmentioning

confidence: 99%

Semi‐Biosynthesis of Magnetite‐Gold Composite Nanoparticles Using an Ethanol Extract of Eucalyptus camaldulensis and Study of the Surface Chemistry

Haratifar

Shahverdi

Shakibaie

et al. 2009

Journal of Nanomaterials

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Green synthesis of metal nanoparticles, such as silver or gold nanoparticles, has been attracting increasing attention in recent years. Functionalized magnetite nanoparticles have many uses in various applications, including nanoelectronic devices, molecular recognition, biomedical applications, drug delivery targeting, and optical devices. In this investigation, magnetic cores (Fe3O4) were synthesized using a fabrication method involving coprecipitation ofFe2+andFe3+. In the next step, magnetite-gold composite nanoparticles were synthesized with size ranging from 6–20 nm, using an ethanol extract ofEucalyptus camaldulensisas a natural reducing agent. Transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction spectroscopy, and visible absorption spectroscopy confirmed the fabrication of magnetite-gold composite nanoparticles. In the UV spectra diagram, a red-shift of the surface plasmon of the Au was evidence that contact between gold andFe3O4had occurred. The surface chemistry of the as-prepared magnetite-gold nanoparticles was studied using infrared spectroscopy. The presence of organic compounds with a carboxyl moiety was confirmed on the surface of the magnetite-gold nanoparticles fabricated by this combined chemical and biological reducing process, which we have designated as a semi-biosynthesis method.

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Magnetic stability of Al2O3-coated fcc-Co nanocapsules

Cited by 9 publications

References 27 publications

Synthesis of nickel nanocapsules and carbon nanotubes via methane CVD

Synthesis of nickel nanocapsules and carbon nanotubes via methane CVD

SiO<sub>2</sub>-Coated Fe-Ni Alloy Core–Shell Structures Synthesized by a Facile Chemical Method

Semi‐Biosynthesis of Magnetite‐Gold Composite Nanoparticles Using an Ethanol Extract of Eucalyptus camaldulensis and Study of the Surface Chemistry

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