Tuesday, January 27, 2009

US Patent 7481989 - Equal length nanotube separation


This patent based on original research from Richard Smalley's group at Rice University (priority 1997) includes some basic claims to forming uniform length segments of nanotube material. Claim 1 reads:

1. A method for producing fullerene nanotubes, said method comprising the steps of:

(a) providing a fullerene nanotube-containing material;

(b) cutting the fullerene nanotube containing-material to form a mixture of fullerene nanotubes having lengths in the range of about 5 to 500 nm; and

(c) fractionating said mixture of fullerene nanotubes to form a fraction of said fullerene nanotubes having substantially equal lengths.