KAMAN, O.; POLLERT, Emil; VEVERKA, P.; VEVERKA, M.; HADOVA, E.; KNIZEK, Karel; MARYŠKO, Miroslav; KAŠPAR, Petr; KLEMENTOVA, M.; GRÜNWALDOVÁ, V.; VASSEUR, Sébastien; EPHERRE, Romain; MORNET, Stéphane; GOGLIO, Graziella; DUGUET, Etienne

doi:10.1088/0957-4484/20/27/275610

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KAMAN, O.
Institute of Physics
Department of Inorganic Chemistry

POLLERT, Emil
Institute of Physics

VEVERKA, P.
Institute of Physics

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Nanotechnology. 2009, vol. 20, n° 27, p. 275610 (7 p.)

Institute of Physics

Résumé en anglais

Nanoparticles of manganese perovskite of the composition La0.75Sr0.25MnO3 uniformly coated with silica were prepared by encapsulation of the magnetic cores (mean crystallite size 24 nm) using tetraethoxysilane followed by fractionation. The resulting hybrid particles form a stable suspension in an aqueous environment at physiological pH and possess a narrow hydrodynamic size distribution. Both calorimetric heating experiments and direct measurements of hysteresis loops in the alternating field revealed high specific power losses, further enhanced by the encapsulation procedure in the case of the coated particles. The corresponding results are discussed on the basis of complex characterization of the particles and especially detailed magnetic measurements. Moreover, the Curie temperature (335 K) of the selected magnetic cores resolves the risk of local overheating during hyperthermia treatment.< Réduire

Mots clés en italien

Manganese

Silica

Nanoparticles

Magnetism

Hyperthermia

Encapsulation

Perovskite

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Silica encapsulated manganese perovskite nanoparticles for magnetically induced hyperthermia without the risk of overheating

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