Methods of preparing three-dimensional, macroscopic assemblages of carbon fibrils and the products obtained thereby
AssigneeHyperion Catalysis Int'l., Inc.
InventorsHoward Tennent, Robert W. Hausslein, Nicholas Leventis, David Moy
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Abstract
A method of making randomly oriented carbons fibrils having a cylindrical constant diameter with c-axes perpendicular to their cylindrical axis, which are free of pyrolytically deposited carbon, with a diameter of between 3.5 and 70 nanometers, by dispersing carbon fibrils in a medium and separating them from the medium, by filtration or evaporation to form a porous mat or sheet.
Claims20
A method of preparing a three-dimensional, macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils, said fibrils being substantially cylindrical with a substantially constant diameter, having c-axes substantially perpendicular to their cylindrical axis, being substantially free of pyrolytically deposited carbon and having a diameter between about 3.5 and 70 nanometers, said assemblage having a bulk density of from 0.001 to 0.50 gm/cc, comprising the steps of:
- (a) dispersing a multiplicity of said fibrils in a medium;
- and
- (b) separating said assemblage from said medium.
A method of preparing a composite of (a) a three-dimensional, macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils, said fibrils being substantially cylindrical with a substantially constant diameter, having c-axes substantially perpendicular to their cylindrical axis, being substantially free of pyrolytically deposited carbon and having a diameter between about 3.5 and 70 nanometers, said assemblage having a bulk density of from 0.001 to 0.50 gm/cc, and (b) a second material, comprising the steps of:
- (a) dispersing a multiplicity of said fibrils and a second material in a medium;
- and
- (b) separating said composite from said medium.
A method of preparing a three-dimensional, macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils, said fibrils being substantially cylindrical with a substantially constant diameter, having c-axes less than substantially perpendicular to their cylindrical axis, being substantially free of pyrolytically deposited carbon and having a diameter between about 3.5 and 70 nanometers, said assemblage having a bulk density of from 0.001 to 0.50 gm/cc, comprising the steps of:
- (a) dispersing a multiplicity of said fibrils in a medium;
- and
- (b) separating said assemblage from said medium.
A method of preparing a three-dimensional, macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils, said fibrils being substantially free of pyrolytically deposited carbon, said assemblage having a bulk density of from 0.001 to 0.50 gm/cc comprising the steps of:
- (a) dispersing a multiplicity of said fibrils in a medium;
- and
- (b) separating said assemblage from said medium.
Dependencies are inferred from the claim text.