The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Jun. 06, 2008
Christine Bogicevic, Meudon, FR;
Fabienne Karolak, Fresnes, FR;
Gianguido Baldinozzi, Antony, FR;
Mickael Dollé, Toulouse, FR;
Dominique Gosset, Bourg la Reine, FR;
David Simeone, Massy, FR;
Christine Bogicevic, Meudon, FR;
Fabienne Karolak, Fresnes, FR;
Gianguido Baldinozzi, Antony, FR;
Mickael Dollé, Toulouse, FR;
Dominique Gosset, Bourg la Reine, FR;
David Simeone, Massy, FR;
Commissariat a l'Energie Atomique-CEA, Paris, FR;
Ecole Centrale de Paris-ECP, Chatenay-Malabry, FR;
Centre National de la Recherche Scientifique (CNRS), Paris Cedex, FR;
Abstract
The invention relates to a method for producing nanoparticles of at least one oxide of a transition metal selected from Ti, Zr, Hf, V, Nb and Ta, which are coated with amorphous carbon, wherein said method includes the following successive steps: (i) a liquid mixture containing as precursors at least one alkoxyde of the transition metal, an alcohol, and an acetic acid relative to the transition metal is prepared and diluted in water in order to form an aqueous solution, the precursors being present in the solution according to a molar ratio such that it prevents or sufficiently limits the formation of a sol so that the aqueous solution can be freeze-dried, and such that the transition metal, the carbon and the oxygen are present in a stoichiometric ratio according to which they are included in the nanoparticles; (ii) the aqueous solution is freeze-dried; (ii) the freeze-dried product obtained during the preceding step is submitted to pyrolysis under vacuum or in an inert atmosphere in order to obtain the nanoparticles. The invention also relates to the application of the method for producing transition metal carbide.