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- W2000964180 abstract "A very fast self-combustion reaction was applied for the first time to the synthesis of a series of magnetic CoFe2O4−SiO2 nanocomposites in a wide range of compositions (from 5 to 50 wt % CoFe2O4). Combining a gelation method that adopts metal nitrates, citric acid and tetraethoxysilane as precursors with controlled thermal treatments, a wide variety of samples with properties finely modulated were obtained. Particle formation and evolution of the structural and magnetic properties with the temperature were investigated by thermal analysis, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, nitrogen physisorption, IR, and magnetic susceptibility measurements. It was shown that the formation of metal ammonium carboxylate complexes takes place in all the gel precursors, contributing to the control of nucleation and growth of the nanoparticles. Spherical particles with narrow particle size distribution, uniformly dispersed in the matrix, are obtained in the diluted samples (N5, N10, N15), while nanoparticles with more irregular shapes form in samples with high CoFe2O4 content (N30, N50). Magnetic properties evolve with CoFe2O4 amounts and thermal treatments. The samples treated at 900 °C exhibit superparamagnetic behavior, with the expected dependence of the magnetic relaxation on particle size." @default.
- W2000964180 created "2016-06-24" @default.
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- W2000964180 date "2006-07-13" @default.
- W2000964180 modified "2023-10-17" @default.
- W2000964180 title "Synthesis and Characterization of CoFe<sub>2</sub>O<sub>4</sub> Nanoparticles Dispersed in a Silica Matrix by a Sol−Gel Autocombustion Method" @default.
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- W2000964180 doi "https://doi.org/10.1021/cm060650n" @default.
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