期刊
NANOTECHNOLOGY
卷 20, 期 27, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/27/275610
关键词
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资金
- Academy of Sciences of the Czech Republic [KAN200200651, KAN201110651]
- Agency of the Academy of Sciences of the Czech Republic [KJB100100701]
- Centre National de la Recherche Scientifique
- European Network of Excellence FAME
Nanoparticles of manganese perovskite of the composition La(0.75)Sr(0.25)MnO(3) 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.
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