GRASSET, Fabien; LABHSETWAR, N.; LI, D.; PARK, D. C.; SAITO, Noriko; HANEDA, Hajime; CADOR, Olivier; ROISNEL, Thierry; MORNET, Stéphane; DUGUET, Etienne; PORTIER, Josik; ETOURNEAU, Jean

doi:10.1021/la020322b

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GRASSET, Fabien
National Institute for Materials Science [NIMS]
Institut de Chimie de Rennes [ICR]

LABHSETWAR, N.
National Institute for Materials Science [NIMS]

LI, D.
National Institute for Materials Science [NIMS]

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Langmuir. 2002, vol. 18, n° 21, p. 8209-8216

American Chemical Society

Résumé en anglais

Synthesis of nanoparticles under restricted environments offered by water-in-oil microemulsions provides excellent control over particle size and shape and interparticle spacing. These environments have been used in the synthesis of silica nanoparticles with a ZnFe2O4 magnetic core. First, aqueous magnetic fluids constituted of zinc ferrite nanoparticles with a size ranging between 4 and 6 nm have been synthesized using a soft chemical approach. Chemical analysis has shown that the zinc ferrite nanoparticles are nonstoichiometric with the estimated formula Zn0.87Fe2.09X0.04O4 (X represents vacancies). The obtained silica nanoparticles (40−60 nm) with a zinc ferrite magnetic core (4−6 nm) have been characterized by X-ray diffraction, electron microscopy, and magnetization measurements. Preliminary magnetic measurements have inferred that the magnetic properties of these nanoparticles at low temperature are essentially governed by the interface particle−habitat.< Réduire

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Ferrites

Zinc

Nanoparticles

Chemical synthesis

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Synthesis and magnetic characterization of zinc ferrite nanoparticles with different environments: powder, colloidal solution, and zinc ferrite-silica core-shell nanoparticles

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