Silica encapsulated manganese perovskite nanoparticles for magnetically induced hyperthermia without the risk of overheating
Language
en
Article de revue
This item was published in
Nanotechnology. 2009, vol. 20, n° 27, p. 275610 (7 p.)
Institute of Physics
English Abstract
Nanoparticles of manganese perovskite of the composition La<sub>0.75</sub>Sr<sub>0.25</sub>MnO<sub>3</sub> uniformly coated with silica were prepared by encapsulation of the magnetic cores (mean crystallite size 24 nm) ...Read more >
Nanoparticles of manganese perovskite of the composition La<sub>0.75</sub>Sr<sub>0.25</sub>MnO<sub>3</sub> 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.Read less <
Italian Keywords
Manganese
Silica
Nanoparticles
Magnetism
Hyperthermia
Encapsulation
Perovskite
Origin
Hal imported