Nanoparticles consisting of a magnetic core (gamma-Fe2O3) and an organic shell were prepared by thermal decomposition of an iron carbonyl complex in the presence of oleic acid. The nanoparticles were then dispersed in cyclohexane to form a stable ferrofluid. These dispersions were investigated by means of Small Angle Scattering of X-rays (SAXS) and the data were interpreted according to a "pearl necklace" model, opportunely modified to account for the core-shell structure of the magnetic nanoparticles. The results of the fittings show that nearly monodisperse spherical particles with a radius of the magnetic core of about 3.9 nm and a shell of about 2 nm were obtained. These nanoparticles self-assemble in chain-like structures, even in the absence of an applied magnetic field.

SAXS Study of Chain-like Structures Formed by Magnetic Nanoparticles / M. BONINI; E. FRATINI; P. BAGLIONI. - In: MATERIALS SCIENCE AND ENGINEERING. C, BIOMIMETIC MATERIALS, SENSORS AND SYSTEMS. - ISSN 0928-4931. - STAMPA. - 27:(2007), pp. 1377-1381. [10.1016/j.msec.2006.09.002]

SAXS Study of Chain-like Structures Formed by Magnetic Nanoparticles

BONINI, MASSIMO;FRATINI, EMILIANO;BAGLIONI, PIERO
2007

Abstract

Nanoparticles consisting of a magnetic core (gamma-Fe2O3) and an organic shell were prepared by thermal decomposition of an iron carbonyl complex in the presence of oleic acid. The nanoparticles were then dispersed in cyclohexane to form a stable ferrofluid. These dispersions were investigated by means of Small Angle Scattering of X-rays (SAXS) and the data were interpreted according to a "pearl necklace" model, opportunely modified to account for the core-shell structure of the magnetic nanoparticles. The results of the fittings show that nearly monodisperse spherical particles with a radius of the magnetic core of about 3.9 nm and a shell of about 2 nm were obtained. These nanoparticles self-assemble in chain-like structures, even in the absence of an applied magnetic field.
2007
27
1377
1381
M. BONINI; E. FRATINI; P. BAGLIONI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/252503
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