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Methods for purifying carbon materials

United States Patent

May 26, 2009
View the Complete Patent at the US Patent & Trademark Office
Methods of purifying samples are provided that are capable of removing carbonaceous and noncarbonaceous impurities from a sample containing a carbon material having a selected structure. Purification methods are provided for removing residual metal catalyst particles enclosed in multilayer carbonaceous impurities in samples generate by catalytic synthesis methods. Purification methods are provided wherein carbonaceous impurities in a sample are at least partially exfoliated, thereby facilitating subsequent removal of carbonaceous and noncarbonaceous impurities from the sample. Methods of purifying carbon nanotube-containing samples are provided wherein an intercalant is added to the sample and subsequently reacted with an exfoliation initiator to achieve exfoliation of carbonaceous impurities.
Dailly; Anne (Pasadena, CA), Ahn; Channing (Pasadena, CA), Yazami; Rachid (Los Angeles, CA), Fultz; Brent T. (Pasadena, CA)
California Institute of Technology (Pasadena, CA), Centre National de la Recherche Scientifique (Paris, FR)
11/ 081,841
March 16, 2005
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made, at least in part, with United States governmental support awarded by Department of Energy Grant DE-FC36-01GO11090. The United States Government has certain rights in this invention.