GRASSET, Fabien; MORNET, Stéphane; DEMOURGUES, Alain; PORTIER, Josik; BONNET, Jacques; VEKRIS, Antoine; DUGUET, Etienne

doi:10.1016/S0304-8853(01)00386-9

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GRASSET, Fabien
National Institute for Materials Science [NIMS]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MORNET, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DEMOURGUES, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Magnetism and Magnetic Materials. 2001-09, vol. 234, n° 3, p. 409-418

Elsevier

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Yttrium aluminum iron garnet Y3Fe5−xAlxO12 compounds were produced by the citrate gel process by varying the aluminum content x from 0 to 2. Particles with an average size of about 100 nm and a specific surface area ranging from 6 to 28 m2/g were obtained. Curie temperatures (TC) were determined from the temperature dependence of the field-cooled magnetization (FCM) and the remnant magnetization (REM) and range from –40°C to 280°C. According to the magnetic moment variation, the aluminum cation seems to replace the iron cation in the tetrahedral site for compounds with x<0.7. 3-Aminopropyltrimethoxysilane (γ-APS) was grafted onto the particles surface and its presence confirmed by infra-red spectroscopy. Cytotoxicity assays were carried out during a period of 13 days using human microglia and rat glioblastoma cell lines. The presence of the amine-functionalized particles did not affect the cell viability or the culture growth rate. Finally, amine-functionalized particles were successfully labeled with covalently linked fluorescing molecules.< Leer menos

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Synthesis, magnetic properties, surface modification and cytotoxicity evaluation of Y3Fe5−xAlxO12 (0⩽x⩽2) garnet submicron particles for biomedical applications

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