Behabtu
Natnael Behabtu, Wilmington, DE US
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20120063988 | Dissolution Of Graphite, Graphite And Graphene Nanoribbons In Superacid Solutions And Manipulation Thereof - Methods for dissolving carbon materials such as, for example, graphite, graphite oxide, oxidized graphene nanoribbons and reduced graphene nanoribbons in a solvent containing at least one superacid are described herein. Both isotropic and liquid crystalline solutions can be produced, depending on the concentration of the carbon material The superacid solutions can be formed into articles such as, for example, fibers and films, mixed with other materials such as, for example, polymers, or used for functionalization of the carbon material. The superacid results in exfoliation of the carbon material to produce individual particles of the carbon material. In some embodiments, graphite or graphite oxide is dissolved in a solvent containing at least one superacid to form graphene or graphene oxide, which can be subsequently isolated. In some embodiments, liquid crystalline solutions of oxidized graphene nanoribbons in water are also described. | 03-15-2012 |
20120295091 | PROCESSES FOR FABRICATING FILMS OF GRAPHENE, CARBON NANOTUBES, AND OTHER CARBON NANOSTRUCTURES ON VARIOUS TYPES OF SUBSTRATES - Methods for producing carbon films are disclosed herein. The methods include treating a carbon nanostructure with one or more dispersing agents, filtering the solution through a filter membrane to form the carbon film, releasing the carbon film from the filter membrane, and transferring the film onto a desired substrate without the use of sonication. Carbon films formed by said methods are also disclosed herein. | 11-22-2012 |
20140363669 | CARBON NANOTUBES FIBER HAVING LOW RESISTIVITY, HIGH MODULUS AND/OR HIGH THERMAL CONDUCTIVITY AND A METHOD OF PREPARING SUCH FIBERS BY SPINNING USING A FIBER SPIN-DOPE - Carbon nanotubes (CNT) fibers having a resistivity lower than 120 μΩ*cm are prepared by a wet spinning process including the steps of supplying a spin-dope of carbon nanotubes to a spinneret, extruding the spin-dope through at least one spinning hole in the spinneret to form spun carbon nanotubes fibers, and coagulating the spun carbon nanotubes fibers in a coagulation medium to form coagulated carbon nanotubes fibers. The carbon nanotubes fibers are drawn at a draw ratio higher than 1.0. The carbon nanotubes have a length of at least 0.5 μm. The carbon nanotubes fibers can further have a resistivity lower than 50 μΩ*cm. At the same time, the CNT fibers can have high modulus. | 12-11-2014 |
Natnael Behabtu, Houston, TX US
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20150298164 | CARBON NANOTUBE FILMS PROCESSED FROM STRONG ACID SOLUTIONS AND METHODS FOR PRODUCTION THEREOF - In some embodiments, the present disclosure provides methods for fabricating carbon nanotube films. Such methods generally comprise: (i) suspending carbon nanotubes in a superacid (e.g. chloro sulfonic acid) to form a dispersed carbon nanotube-superacid solution, wherein the carbon nanotubes have substantially exposed sidewalls in the carbon nanotube-superacid solution; (ii) applying the dispersed carbon nanotube-superacid solution onto a surface to form a carbon nanotube film; and (iii) removing the superacid. Desirably, such methods occur without the utilization of carbon nanotube wrapping molecules or sonication. Further embodiments of the present disclosure pertain to carbon nanotube films that are fabricated in accordance with the methods of the present disclosure. Such carbon nanotube films comprise a plurality of carbon nanotubes that are dispersed and individualized. Additional embodiments of the present disclosure pertain to macroscopic objects comprising the carbon nanotube films made in accordance with the methods of the present disclosure described supra. | 10-22-2015 |
Natneal Behabtu, Houston, TX US
Patent application number | Description | Published |
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20110110843 | NEAT CARBON NANOTUBE ARTICLES PROCESSED FROM SUPER ACID SOLUTIONS AND METHODS FOR PRODUCTION THEREOF - Articles comprising neat, aligned carbon nanotubes and methods for production thereof are disclosed. The articles and methods comprise extrusion of a super acid solution of carbon nanotubes followed by removal of the super acid solvent. The articles may be processed by wet-jet wet spinning, dry-jet wet spinning, and coagulant co-flow extrusion techniques. | 05-12-2011 |