Tuesday, February 07, 2012

US Patent 8110125 - Separation of carbon nanotubes by density gradients


This patent from Northwestern University has priority going back to 2005 and includes some basic claims to sorting single walled carbon nanotubes between metallic and semiconducting types. Claim 1 reads:

1. A system for separation of single-walled carbon nanotubes, said system comprising:

a fluid medium comprising a density gradient; and

a nanotube composition comprising single-walled carbon nanotubes of mixed nanotube diameters, chiralities, electronic types, or combinations thereof and at least one surface active component.