Tuesday, September 20, 2011

US Patent 8021640 - Manufacturing carbon nanotube paper


This patent from SNU R+DB Foundation teaches a way to form macroscale CNT papers, sheets, wraps, or films having a two-dimensional structure and improved mechanical, electrical, and chemical characteristics. Claim 1 reads:

1. A method for making a carbon nanotube (CNT) paper comprising:

disposing a blade having a sharp edge portion into a CNT colloidal solution such that CNTs in the CNT colloidal solution adhere to the sharp edge portion; and

withdrawing the blade from the CNT colloidal solution to form the CNT paper at the interface between the sharp edge portion and the CNT colloidal solution, wherein an influx of carbon nanotubes from the CNT colloidal solution towards the blade occurs due to a meniscus and the influx is in the range of about 1 cm/hour to about 9 cm/hour.