Magnetic nanoparticles of noble metals

H - Electricity – 01 – F

Patent

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H01F 1/00 (2006.01) B22F 1/02 (2006.01)

Patent

CA 2560892

The invention relates to nanoparticles of noble metals, having a controlled microstructure which leads to the appearance of ferromagnetic behaviour in said nanoparticles, thereby enabling the use of very small magnets (< 5 nm) in a range in which standard ferromagnetic metals behave as superparamagnetic entities (disappearance of hysteresis cycle). The inventive nanoparticles can be used, for example, to reduce the dimensions in magnetic recordings, as well as in biomedicine as tools for biomolecule recognition, nuclear magnetic resonance imaging, drug-release control or hypothermia treatments.

La présente invention concerne des nanoparticules en métaux nobles présentant une microstructure régulée conduisant à l'apparition d'un comportement ferromagnétique dans lesdites nanoparticules, ce qui permet d'obtenir des aimants ayant de très petites dimensions (< 5 nm) dans une gamme dans laquelle les métaux ferromagnétiques classiques ont des comportements superparamagnétiques (disparition du cycle d'hystérésis). Une application possible est la réduction des dimensions dans des registres magnétiques et également en biomédecine, en tant qu'instruments de reconnaissance de biomolécules, en imagerie par résonance magnétique nucléaire, dans la régulation de la libération d'agents pharmaceutiques ou thérapeutiques contre l'hyperthermie.

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