摘要:
Carbon nanostructures are formed from a carbon precursor and catalytic templating nanoparticles. Methods for manufacturing carbon nanostructures generally include (1) forming a precursor mixture that includes a carbon precursor and a plurality of catalytic templating particles, (2) carbonizing the precursor mixture to form an intermediate carbon material including carbon nanostructures, amorphous carbon, and catalytic metal, (3) purifying the intermediate carbon material by removing at least a portion of the amorphous carbon and optionally at least a portion of the catalytic metal, and (4) heat treating the purified intermediate carbon material and/or treating the purified intermediate carbon material with a base to remove functional groups on the surface thereof. The removal of functional groups increases the graphitic content of the carbon nanomaterial and decreases its; hydrophilicity.
摘要:
Powdered, amorphous carbon nanomaterials are formed from a carbon precursor in reverse microemulsion that includes organic solvent, surfactant and water. Methods for manufacturing amorphous, powdered carbon nanomaterials generally include steps of (1) forming a reverse microemulsion including at least one non-polar solvent, at least one surfactant, and at least one polar solvent, (2) adding at least one carbon precursor substance to the reverse microemulsion, (3) reacting the at least one carbon precursor substance so as to form an intermediate carbon nanomaterial, (4) separating the intermediate amorphous carbon nanomaterial from the reverse microemulsion, and (5) heating the intermediate amorphous carbon nanomaterial for a period of time so as to yield an amorphous, powdered carbon nanomaterial. Amorphous, powdered carbon nanomaterials manufactured according to the present disclosure typically have a surface area of at least 500 m2/g, a graphitic content of at least 25%, and a conductivity of at least 150 S/m.
摘要:
The present invention relates to novel composites that incorporate carbon nanospheres into a polymeric material. The polymeric material can be any polymer or polymerizable material compatible with graphitic materials. The carbon nanospheres are hollow, graphitic nanoparticles. The carbon nanospheres can be manufactured from a carbon precursor using templating catalytic nanoparticles. The unique size, shape, and electrical properties of the carbon nanospheres impart beneficial properties to the composites incorporating these nanomaterials.
摘要:
Hydrogen is stored by adsorbing the hydrogen to a carbon nanomaterial that includes carbon nanospheres. The carbon nanospheres are multi-walled, hollow carbon nanostructures with a maximum diameter in a range from about 10 nm to about 200 nm. The nanospheres have an irregular outer surface and an aspect ratio of less than 3:1. The carbon nanospheres can store hydrogen in quantities of at least 1.0% by weight.
摘要:
Methods for manufacturing carbon nanostructures include: 1) forming a plurality of catalytic templating particles using a plurality of dispersing agent molecules; 2) forming an intermediate carbon nanostructure by polymerizing a carbon precursor in the presence of the plurality of templating nanoparticles; 3) carbonizing the intermediate carbon nanostructure to form a composite nanostructure; and 4) removing the templating nanoparticles from the composite nanostructure to yield the carbon nanostructures. The carbon nanostructures are well-suited for use as a catalyst support. The carbon nanostructures exhibit high surface area, high porosity, and high graphitization. Carbon nanostructures according to the invention can be used as a substitute for more expensive and likely more fragile carbon nanotubes.
摘要:
Hydrogen is stored by adsorbing the hydrogen to a carbon nanomaterial that includes carbon nanospheres. The carbon nanospheres are multi-walled, hollow carbon nanostructures with a maximum diameter in a range from about 10 nm to about 200 nm. The nanospheres have an irregular outer surface with graphitic defects and an aspect ratio of less than 3:1. The carbon nanospheres can store hydrogen in quantities of at least 1.0% by weight.
摘要:
Carbon nanostructures are formed from a carbon precursor and catalytic templating nanoparticles and are treated with a severe oxidative agent to introduce oxygen-containing functional groups to the surface of the graphitic material. Methods for manufacturing carbon nanostructures generally include (1) forming a precursor mixture that includes a carbon precursor and a plurality of catalytic templating particles, (2) carbonizing the precursor mixture to form an intermediate carbon material including carbon nanostructures, amorphous carbon, and catalytic metal, (3) purifying the intermediate carbon material by removing at least a portion of the amorphous carbon and optionally at least a portion of the catalytic metal, and (4) treating the intermediate carbon material with a severe oxidative treatment to increase surface functionalization. Examples of oxidative treatments include (i) a mixture of nitric acid and sulfuric acid, (ii) a solution of hydrogen peroxide, or (iii) a mixture of sulfuric acid and hydrogen peroxide.
摘要:
The carbon nanomaterials and methods relate to methods for causing carbon nanospheres to be readily dispersible in a material. The carbon nanospheres are rendered dispersible using a cationic surfactant. The surfactant includes one or more cationic group that can bond to the surface of the carbon nanospheres, without detrimentally affecting the unique properties of carbon nanospheres. The dispersible carbon nanospheres can be dried (i.e., solvent is driven off) while maintaining their dispersibility in solvents and other materials.
摘要:
The present invention relates to novel composites that incorporate carbon nanospheres into a polymeric material. The polymeric material can be any polymer or polymerizable material compatible with graphitic materials. The carbon nanospheres are hollow, graphitic nanoparticles. The carbon nanospheres can be manufactured from a carbon precursor using templating catalytic nanoparticles. The unique size, shape, and electrical properties of the carbon nanospheres impart beneficial properties to the composites incorporating these nanomaterials.
摘要:
The particle sizes of agglomerates of carbon nanospheres are reduced by dispersing the carbon nanospheres in a polar solvent. The carbon nanospheres are multi-walled, hollow, graphitic structures with an average diameter in a range from about 10 nm to about 200 nm, more preferably about 20 nm to about 100 nm. Spectral data shows that prior to being dispersed, the carbon nanospheres are agglomerated into clusters that range in size from 500 nm to 5 microns. The clusters of nanospheres are reduced in size by dispersing the carbon nanospheres in the polar solvent (e.g., water) using a surface modifying agent (e.g., glucose) and ultrasonication. The combination of polar solvent, surface modifying agent, and ultrasonication breaks up and disperses agglomerates of carbon nanospheres.