Inventors:
Sara Majetich - Pittsburgh PA
Michael McHenry - Pittsburgh PA
John H. Scott - Pittsburgh PA
Elaine Brunsman - Pittsburgh PA
Scott Kirkpatrick - Pittsburgh PA
Assignee:
Carnegie Mellon University - Pittsburgh PA
International Classification:
B32B 516, B32B 1502
Abstract:
A metal or alloy nanoparticle is provided which exhibits hysteresis at room temperature having a carbon coating. The nanoparticle has a diameter in the range of approximately 0. 5 to 50 nm, and may crystalline or amorphous. The metal, alloy, or metal carbide nanoparticle is formed by preparing graphite rods which are packed with the magnetic metal or alloy. or an oxide of the metal or alloy. The packed graphite rods are subjected to a carbon arc discharge to produce soot containing metal, alloy, or metal carbide nanoparticles and non-magnetic species. The spot is subsequently subjected to a magnetic field gradient to separate the metal, alloy, or metal carbide nanoparticles from the non-magnetic species.