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US 6,506,355 B1Granted
Production of high surface energy, high surface area vapor grown carbon fiber
AssigneeApplied Sciences, Inc.
InventorsD. Gerald Glasgow, Max L. Lake
Life of this patent
Estimating the term…
Abstract
High surface energy vapor grown carbon fibers and methods of making such fibers. The high surface energy vapor grown carbon fibers of the present invention have a surface energy greater than about 75 mJ/m2 without post-manufacture treatment.
Claims46
A method of making a high surface energy vapor grown carbon fiber comprising;
- forming a mixture comprising a gaseous hydrocarbon, ammonia, and an iron-containing compound decomposable to form iron nucleation sites dispersed in a carrier of gaseous oxidant, the hydrocarbon and the ammonia each being present in an amount sufficient to provide a ratio of carbon atoms to nitrogen atoms in a range from about 1:1 to 30:1;
- heating the mixture containing the gaseous oxidant in a reactor for a time and at a temperature sufficient to cause decomposition of the decomposable compound to form particles of nanometer size iron nucleation sites dispersed and entrained in the gaseous mixture which induce growth of carbon fibers, and to thereby form high surface energy vapor grown carbon fibers having an average diameter of about 0.05 to about 0.5 micron and containing carbon and nitrogen and having a surface energy greater than about 75 mJ/m2;
- and
- recovering the high surface energy vapor grown carbon fibers.
1 more element
A method of making a high surface energy vapor grown carbon fiber comprising:
- forming a mixture comprising a gaseous hydrocarbon, ammonia, and an iron-containing compound decomposable to form iron nucleation sites, the hydrocarbon and the ammonia each being present in an amount sufficient to provide a ratio of carbon atoms to nitrogen atoms in a range of from about 1:1 to 30:1;
- introducing a gaseous oxidant into the mixture before forming the high surface energy vapor grown carbon fibers;
- heating the mixture containing the gaseous oxidant in a reactor for a time and at a temperature sufficient to cause decomposition of the decomposable compound to form particles of nanometer size iron nucleation sites dispersed and entrained in the gaseous mixture which induce growth of carbon fibers, and to thereby form high surface energy vapor grown carbon fibers having an average diameter of about 0.05 to about 0.5 micron and containing carbon and nitrogen and having a surface energy greater than about 75 mJ/m2;
- and
- recovering the high surface energy vapor grown carbon fibers.
2 more elements
A method of making a high surface energy vapor grown carbon fiber comprising:
- forming a mixture comprising a gaseous hydrocarbon, ammonia, and an iron-containing compound decomposable to form iron nucleation sites, the hydrocarbon and the ammonia each being present in an amount sufficient to provide a ratio of carbon atoms to nitrogen atoms in a range of from about 1:1 to 30:1;
- heating the mixture in a reactor for a time and at a temperature sufficient to cause decomposition of the decomposable compound to form particles of nanometer size iron nucleation sites dispersed and entrained in the gaseous mixture which induce growth of carbon fibers and to thereby form vapor grown carbon fibers having an average diameter of about 0.05 to about 0.5 micron and containing carbon and nitrogen;
- introducing a gaseous oxidant at the exit of the reactor and modifying the surface of the vapor grown carbon fibers to form high surface energy vapor grown carbon fibers having a surface energy greater than about 75 mJ/m2;
- and
- recovering the high surface energy vapor grown carbon fibers.
2 more elements
Dependencies are inferred from the claim text.