US Patent 7833925 - Method of preparing metal nanoparticles

http://www.freepatentsonline.com/7833925.html

This patent from Samsung teaches a method of large scale production of metal nanoparticles to be used as catalysts in fuel cells. Claim 1 reads:

1. A method of manufacturing metal nanoparticles, comprising:

preparing a mixed solution by mixing a metal precursor with a solvent; and

producing the metal nanoparticles by reducing the metal precursor by radiating the mixed solution with an ion beam radiated by accelerating ions to 10 MeV to 100 MeV with a current of 100 nA to 50 μA.