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

doi:10.1021/cm011535+

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

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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 language	English
Pages (from-to)	1778-1787
Number of pages	10
Journal	Chemistry of Materials
Volume	14
Issue number	4
DOIs	https://doi.org/10.1021/cm011535+
State	Published - 2002
Externally published	Yes

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title = "Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating",

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, M{\"o}ssbauer 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.",

author = "Shafi, {Kurikka V.P.M.} and Abraham Ulman and Ansil Dyal and Xingzhong Yan and Yang, {Nan Loh} and Claude Estourn{\`e}s and L{\'e}opold Fourn{\`e}s and Alain Wattiaux and Henry White and Miriam Rafailovich",

year = "2002",

doi = "10.1021/cm011535+",

language = "אנגלית",

volume = "14",

pages = "1778--1787",

journal = "Chemistry of Materials",

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TY - JOUR

T1 - Magnetic enhancement of γ-Fe2O3 nanoparticles by sonochemical coating

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

PY - 2002

Y1 - 2002

N2 - 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.

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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SN - 0897-4756

VL - 14

SP - 1778

EP - 1787

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 4

ER -

Magnetic enhancement of γ-Fe₂O₃ nanoparticles by sonochemical coating

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