Organic-inorganic composite magnetic material and method for...

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H01F 1/00 (2006.01) B22F 1/00 (2006.01) B22F 1/02 (2006.01) B22F 9/24 (2006.01) H01F 1/42 (2006.01) H01F 41/24 (2006.01) H01F 41/30 (2006.01)

Patent

CA 2374181

An organic-inorganic composite magnetic material having superparamagnetism or ferromagnetism which comprises a metal powder and an organic radical chemisorbed on the surface thereof is prepared by a method which comprises reducing a salt of an ion of a metal capable of chemisorptioning a thiol by a reducing agent in the presence of a stabilizing ligand and replacing the stabilizing ligand adsorbed on a soluble fine metal powder by a thiol type organic radical having an unpaired electron, to thereby synthesize a fine metal powder having an organic moiety adsorbed thereon.

L'invention concerne un corps magnétique composite organique-inorganique présentant des propriétés de superparamagnétisme ou de ferromagnétisme, ce corps renfermant une poudre métallique et un radical organique chimiquement sorbé à la surface de cette poudre. On prépare ce corps magnétique selon un procédé qui consiste tout d'abord à réduire un sel d'un ion d'un métal permettant la sorption chimique d'un thiol à l'aide d'un agent réducteur, en présence d'un ligand stabilisateur, ce procédé consistant ensuite à remplacer ce ligand stabilisateur, adsorbé sur une fine poudre métallique soluble, par un radical organique du type thiol comprenant un électron non apparié, ce qui permet de synthétiser une fine poudre métallique sur laquelle est adsorbé un fragment organique.

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