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OwnerLeonardus Wijnand Jenneskens, John Wilhelm Geus +3inventors
InventorsLeonardus Wijnand Jenneskens, John Wilhelm Geus, Bernard Hendrik Reesink, Pieter Hildegardus Berben, Jacobus Hoekstra
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The invention relates to nano-particles comprising metallic ferromagnetic nanocrystals combined with either amorphous or graphitic carbon in which or on which chemical groups are present that can dissociate in aqueous solutions. According to the invention there is provided nano-particles comprising metal particles of at least one ferromagnetic metal, which metal particles are at least in part encapsulated by graphitic carbon. The nano-particles of the invention are prepared by impregnating carbon containing bodies with an aqueous solution of at least one ferromagnetic metal precursor, drying the impregnated bodies, followed by heating the impregnated bodies in an inert and substantially oxygen-free atmosphere, thereby reducing the metal compounds to the corresponding metal or metal alloy.
A nano-particle comprising 3-100 metal particles of at least one ferromagnetic metal, and a graphitic carbon body, wherein said metal particles are at least in part encapsulated by said graphitic carbon body.
A process for the production of a nano-particle comprising a metal-carbon body, wherein said metal-carbon body comprises ferromagnetic metal alloy particles at least partly encapsulated within graphitic carbon, which process comprises impregnating carbon containing body with an aqueous solution of at least one ferromagnetic metal precursor, drying the impregnated body, followed by heating the impregnated body in an inert and substantially oxygen-free atmosphere at a temperature of 450 to 600° C., thereby reducing the metal compounds to the corresponding metal alloy.
A process for the production of a nano-particle comprising a metal-carbon particle, wherein said metal-carbon particle comprises ferromagnetic metal particles at least partly encapsulated within graphitic carbon, which process comprises impregnating a carbon containing body with an aqueous solution of a metal precursor, drying the impregnated body, followed by heating the impregnated body in an inert and substantially oxygen-free atmosphere at a temperature to above 700° C., thereby reducing the metal compound to the corresponding metal.
Dependencies are inferred from the claim text.