Details

Autor(en) / Beteiligte

• Grasset, F
• Labhsetwar, N
• Li, D
• Park, D. C
• Saito, N
• Haneda, H
• Cador, O
• Roisnel, T
• Mornet, S
• Duguet, E
• Portier, J
• Etourneau, J

Titel

Synthesis and Magnetic Characterization of Zinc Ferrite Nanoparticles with Different Environments:  Powder, Colloidal Solution, and Zinc Ferrite−Silica Core−Shell Nanoparticles

Ist Teil von

• Langmuir, 2002-10, Vol.18 (21), p.8209-8216

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2002

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.