Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating

Kurikka V.P.M. Shafi, Abraham Ulman, Ansil Dyal, Xingzhong Yan, Nan Loh Yang, Claude Estournès, Léopold Fournès, Alain Wattiaux, Henry White, Miriam Rafailovich

Research output: Contribution to journalArticle

Abstract

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) (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.

Original languageEnglish (US)
Pages (from-to)1778-1787
Number of pages10
JournalChemistry of Materials
Volume14
Issue number4
DOIs
StatePublished - 2002

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    Shafi, K. V. P. M., Ulman, A., Dyal, A., Yan, X., Yang, N. L., Estournès, C., Fournès, L., Wattiaux, A., White, H., & Rafailovich, M. (2002). Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating. Chemistry of Materials, 14(4), 1778-1787. https://doi.org/10.1021/cm011535+