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

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Magnetization
Nanoparticles
Coatings
Stretching
Sonochemistry
Hydrocarbons
Paramagnetic resonance
X ray diffraction

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Shafi, K. V. P. M., Ulman, A., Dyal, A., Yan, X., Yang, N. L., Estournès, C., ... 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+

Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating. / Shafi, Kurikka V P M; Ulman, Abraham; Dyal, Ansil; Yan, Xingzhong; Yang, Nan Loh; Estournès, Claude; Fournès, Léopold; Wattiaux, Alain; White, Henry; Rafailovich, Miriam.

In: Chemistry of Materials, Vol. 14, No. 4, 2002, p. 1778-1787.

Research output: Contribution to journalArticle

Shafi, KVPM, Ulman, A, Dyal, A, Yan, X, Yang, NL, Estournès, C, Fournès, L, Wattiaux, A, White, H & Rafailovich, M 2002, 'Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating', Chemistry of Materials, vol. 14, no. 4, pp. 1778-1787. https://doi.org/10.1021/cm011535+
Shafi, Kurikka V P M ; Ulman, Abraham ; Dyal, Ansil ; Yan, Xingzhong ; Yang, Nan Loh ; Estournès, Claude ; Fournès, Léopold ; Wattiaux, Alain ; White, Henry ; Rafailovich, Miriam. / Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating. In: Chemistry of Materials. 2002 ; Vol. 14, No. 4. pp. 1778-1787.
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AU - Shafi, Kurikka V P M

AU - Ulman, Abraham

AU - Dyal, Ansil

AU - Yan, Xingzhong

AU - Yang, Nan Loh

AU - Estournès, Claude

AU - Fournès, Léopold

AU - Wattiaux, Alain

AU - White, Henry

AU - Rafailovich, Miriam

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AB - 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.

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