SHAFI, Kurikka V. P. M.; ULMAN, Abraham; DYAL, Ansil; YAN, Xingzhong; YANG, Nan-Loh; ESTOURNÈS, Claude; FOURNÈS, Léopold; WATTIAUX, Alain; WHITE, Henry; RAFAILOVICH, Miriam

doi:10.1021/cm011535+

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SHAFI, Kurikka V. P. M.
Department of Chemical Engineering and Chemistry

ULMAN, Abraham
Department of Chemical Engineering and Chemistry

DYAL, Ansil
Department of Chemical Engineering and Chemistry

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Chemistry of Materials. 2002, vol. 14, n° 4, p. 1778-1787

American Chemical Society

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We show that sonochemistry is an efficient and facile route for quantitative coating of γ-Fe2O3 nanoparticles with octadecyltrihydrosilane (OTHS, CH3(CH2)17SiH3). The presence of C−H stretching (2950−2850 cm-1) and bending (1475−1375 cm-1) bands, and the absence of peaks at 2150 and 925 cm-1 (Si−H stretching and bending respectively) confirm the presence of grafted hydrocarbon chains in the irradiated sample, hence the reaction of OTHS with γ-Fe2O3 nanoparticles. The coated nanoparticles show increased magnetization compared to the uncoated ones. X-ray diffraction, magnetization studies, Mössbauer spectra, and electron paramagnetic resonance spectra reveal that the magnetic ordering is more prominent in the OTHS-coated γ-Fe2O3 sample because of improved crystallinity.< Réduire

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Magnetism

Nanoparticles

Sonochemistry

Coating

Iron oxide

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Magnetic enhancement of g-Fe2O3 nanoparticles by sonochemical coating

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