US Patent 8216542 - Nanotube separation using microwaves

http://www.freepatentsonline.com/8216542.html

This patent from the Korea Institute of Machinery and Materials teaches a way to remove metallic nanotubes from a mixture of carbon nanotubes to produce high purity semiconducting nanotubes. Claim 1 reads:

1. A method for separating semiconducting nanotubes from a nanotube mixture comprised of semiconducting nanotubes and metallic nanotubes, comprising:

dispersing the nanotube mixture into a liquid medium selected from water and ethanol and then applying the dispersion to a substrate made of a material selected from an insulating material or a nonpolar polymer;

selectively heating at least part of the metallic nanotubes in the nanotube mixture by applying microwave radiation to the nanotube mixture after a material comprising carbon black is arranged under the nanotube mixture; and

removing the metallic nanotubes.

US Patent 7396502 - Apparatus for making polymer coated Fe nanopowder

http://www.freepatentsonline.com/7396502.html

Magnetic nanopowder is useful to applications such as high density data storage and high sensitivity magnetic sensors. This patent from the Korea Institute of Machinery and Materials teaches an apparatus for forming Fe nanopowder with a protective polymer coating that prevents oxidation. Claim 1 reads:

1. A system of producing nano-sized Fe powder having a polymer coated layer on a surface thereof, comprising:

a means for gasifying an Fe-containing liquid precursor;

a means for separating nano-sized Fe-particles from the gasified Fe-containing precursor to present Fe as an outermost layer; and

a means for injecting the separated nano-sized Fe particles into a polymer solution to produce the nano-sized Fe powder having a polymer coated layer.