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:
Sep. 10, 2013
Filed:
Jan. 09, 2009
Dan V. Goia, Potsdam, NY (US);
Benjamin Morrow, Queensbury, NY (US);
Egon Matijevic, Potsdam, NY (US);
Krishna Balantrapu, Marlborough, MA (US);
Brendan P. Farrell, Cranston, RI (US);
Dan V. Goia, Potsdam, NY (US);
Benjamin Morrow, Queensbury, NY (US);
Egon Matijevic, Potsdam, NY (US);
Krishna Balantrapu, Marlborough, MA (US);
Brendan P. Farrell, Cranston, RI (US);
Umicore AG & Co. KG, Hanau-Wolfgang, DE;
Abstract
The present invention is directed to a method for preparing colloidal dispersions of precious metal nanoparticles selected from the group consisting of Pt, Au, Pd, Ag, Rh, Ru and mixtures or alloys thereof, and to a method for isolating such precious metal nanoparticles from these colloidal dispersions. The colloidal dispersions are prepared by reducing suitable precious metal precursor compounds in aqueous alkaline solutions at reaction temperatures between 40 and 70° C. and a pH≧12.0 in the presence of polysaccharides with average molecular weights (M) in the range of 300,000 to 1,000,000. The precious metal nanoparticles are isolated after decomposing the polysaccharide by heating the colloidal dispersions to temperatures >80° C. The nanoparticles can be used for the manufacture of core/shell-type catalyst materials and for electronic, decorative and medical applications.