Synthesis and characterisation of metal oxides nanoparticles entrapped in cyclodextrin

D. Bonacchi; A. Caneschi; D. Gatteschi; C. Sangregorio; R. Sessoli; A. Falqui

doi:10.1016/j.jpcs.2003.11.005

Synthesis and characterisation of metal oxides nanoparticles entrapped in cyclodextrin

D. Bonacchi, A. Caneschi^*, D. Gatteschi, C. Sangregorio, R. Sessoli, A. Falqui

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

A new technique to prepare very small metal oxide (γ-Fe ₂O₃, NiO and CoO) magnetic nanoparticles is presented. Nanoparticles are prepared by addition of NaOH to a ferrous chloride solution in the presence of γ-cyclodextrin and once formed are entrapped in the pseudo-single crystals of the oligosaccharide. The resulting crystals give diffraction pattern which looks like those of pure γ-cyclodextrin crystals. Evidences of nanosized particles embedded in the organic crystals were obtained by HREM. The magnetic properties, investigated by ZFC-FC magnetisations, hysteresis loops and ac susceptibility measurements, deviate from those predicted on the basis of the classic single domain particles model due to the complex properties of the surface which for such small sizes, plays the major role in the total magnetic behaviour.

Original language	English (US)
Pages (from-to)	719-722
Number of pages	4
Journal	Journal of Physics and Chemistry of Solids
Volume	65
Issue number	4
DOIs	https://doi.org/10.1016/j.jpcs.2003.11.005
State	Published - Apr 2004
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/j.jpcs.2003.11.005

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title = "Synthesis and characterisation of metal oxides nanoparticles entrapped in cyclodextrin",

abstract = "A new technique to prepare very small metal oxide (γ-Fe 2O3, NiO and CoO) magnetic nanoparticles is presented. Nanoparticles are prepared by addition of NaOH to a ferrous chloride solution in the presence of γ-cyclodextrin and once formed are entrapped in the pseudo-single crystals of the oligosaccharide. The resulting crystals give diffraction pattern which looks like those of pure γ-cyclodextrin crystals. Evidences of nanosized particles embedded in the organic crystals were obtained by HREM. The magnetic properties, investigated by ZFC-FC magnetisations, hysteresis loops and ac susceptibility measurements, deviate from those predicted on the basis of the classic single domain particles model due to the complex properties of the surface which for such small sizes, plays the major role in the total magnetic behaviour.",

author = "D. Bonacchi and A. Caneschi and D. Gatteschi and C. Sangregorio and R. Sessoli and A. Falqui",

year = "2004",

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volume = "65",

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journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Synthesis and characterisation of metal oxides nanoparticles entrapped in cyclodextrin

AU - Bonacchi, D.

AU - Caneschi, A.

AU - Gatteschi, D.

AU - Sangregorio, C.

AU - Sessoli, R.

AU - Falqui, A.

PY - 2004/4

Y1 - 2004/4

N2 - A new technique to prepare very small metal oxide (γ-Fe 2O3, NiO and CoO) magnetic nanoparticles is presented. Nanoparticles are prepared by addition of NaOH to a ferrous chloride solution in the presence of γ-cyclodextrin and once formed are entrapped in the pseudo-single crystals of the oligosaccharide. The resulting crystals give diffraction pattern which looks like those of pure γ-cyclodextrin crystals. Evidences of nanosized particles embedded in the organic crystals were obtained by HREM. The magnetic properties, investigated by ZFC-FC magnetisations, hysteresis loops and ac susceptibility measurements, deviate from those predicted on the basis of the classic single domain particles model due to the complex properties of the surface which for such small sizes, plays the major role in the total magnetic behaviour.

AB - A new technique to prepare very small metal oxide (γ-Fe 2O3, NiO and CoO) magnetic nanoparticles is presented. Nanoparticles are prepared by addition of NaOH to a ferrous chloride solution in the presence of γ-cyclodextrin and once formed are entrapped in the pseudo-single crystals of the oligosaccharide. The resulting crystals give diffraction pattern which looks like those of pure γ-cyclodextrin crystals. Evidences of nanosized particles embedded in the organic crystals were obtained by HREM. The magnetic properties, investigated by ZFC-FC magnetisations, hysteresis loops and ac susceptibility measurements, deviate from those predicted on the basis of the classic single domain particles model due to the complex properties of the surface which for such small sizes, plays the major role in the total magnetic behaviour.

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DO - 10.1016/j.jpcs.2003.11.005

M3 - Article

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JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 4

ER -

Synthesis and characterisation of metal oxides nanoparticles entrapped in cyclodextrin

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