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Method for the preparation of high surface area high permeability carbons

United States Patent

5,902,562
May 11, 1999
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method for preparing carbon materials having high surface area and high macropore volume to provide high permeability. These carbon materials are prepared by dissolving a carbonizable polymer precursor, in a solvent. The solution is cooled to form a gel. The solvent is extracted from the gel by employing a non-solvent for the polymer. The non-solvent is removed by critical point drying in CO.sub.2 at an elevated pressure and temperature or evaporation in a vacuum oven. The dried product is heated in an inert atmosphere in a first heating step to a first temperature and maintained there for a time sufficient to substantially cross-link the polymer material. The cross-linked polymer material is then carbonized in an inert atmosphere.
Lagasse; Robert R. (Albuquerque, NM), Schroeder; John L. (Albuquerque, NM)
Sandia Corporation (Livermore, CA)
08/ 960,112
October 27, 1997
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL8500 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.