Wednesday, January 27, 2010

Nanometric Carbon Filamentary Structures and Macroscopic Assembly Process Developed at Canada's Institut National De La Recherche Scientifique


U.S. Patent 7,651,668FIG. 20 is a Transmission Electron Microscope (TEM) image of deposited nanometric filamentary structures obtained via a plasma torch method and apparatus developed at Canada's National Institute for Scientific Research. The nanometric filamentary structures are single-wall carbon nanotubes.



Institut National De La Recherche Scientifique (Quebec, CA) scientists Frederic Larouche, Olivier Smiljanic and  Barry L. Stansfield developed the equipment needed for the  macroscopic assembly of nanometric carbon filamentary structures including single wall carbon nanotubes (SWNT). The plasma torch device and method are now protected by U.S. Patent 7,651,668

The macroscopic assembly comprises a plurality of microscopic assemblies substantially aligned in a same direction and connected together. Each of the microscopic assemblies consists of a number of members defining a plurality of spaces therebetween. Each of the members comprises a nanometric filamentary structure or a bundle of nanometric filamentary structures, wherein the macroscopic assembly has a density of less than 8 mg/cm3. The apparatus  also provides a method for preparing such a macroscopic assembly.

The plasma method for depositing nanometric filamentary structures consists of: passing a gaseous phase or gaseous composition comprising the nanometric filamentary structures through a space defined between at least two electrodes generating an electric field, for depositing the nanometric filamentary structures on at least one of the electrodes; and substantially preventing the deposited nanometric filamentary structures from bridging the electrodes during the deposition.  

FIG. 8 is a picture of a microscopic web-like structure of single-wall carbon nanotubes obtained using a method and an apparatus for depositing nanometric filamentary structures  

FIG. 9 is a picture of showing filaments of macroscopic assemblies of nanometric filamentary structures wherein single-wall carbon nanotubes filaments are rolled up around an elongated member

FIG. 10 is closer view of the filaments of macroscopic assemblies of nanometric filamentary structures (single-wall carbon nanotubes) shown in FIG. 9




FIG. 18 is a picture showing aggregates of nanometric filamentary structures flowing in a gaseous phase in an apparatus for depositing nanometric filamentary structures.





FIG. 19 is a picture showing deposited macroscopic assemblies of nanometric filamentary structures forming a macroscopic web-like structure wherein means for preventing the structures from bridging the electrodes have been voluntarily inactivated in order to show structures bridging the two electrodes of the apparatus, and the deposited structures are single-wall carbon nanotubes.




No comments:

Post a Comment