The present invention belongs to the field of new materials technology and discloses a green method for preparing functionalized carbon materials. The present invention can use potassium ferrate(VI) as an oxidant and mechanical milling as a reaction technique for oxidizing carbon materials in a preparation of functionalized carbon materials having oxygen-containing functional groups. Compared with the prior art, the present invention provides a method that combines an environmentally friendly oxidant with an environmentally friendly reaction process. The oxidant potassium ferrate(VI) is a green oxidant without producing any toxic byproducts. The reaction process is solvent-free, facilitated by milling the solid mixture of carbon materials and the oxidant. Thus, the present invention provides an environmentally friendly method for preparing oxidatively functionalized carbon materials, which is of promotion value.

The present invention relates to carbon nanotubes and a preparation method thereof by using PET. The carbon nanotubes of the present invention are prepared by processes of alcoholysis of PET materials, processes of washing, crushing and calcining unreacted intermediates and so on. By the preparation method of the present invention, multi-walled carbon nanotubes prepared by using waste PET have a good conductivity, and are a structure of top-down array with low aspect ratio. The method of the present invention is not only easy to implement, but also does not need a catalyst, and turns the waste PET into treasure, which solves the problem of environmental pollution caused by the increasingly serious waste PET. FIG. 9.

Provided herein are methods off functionalizing a carbon nanotube, functionalized carbon nanotubes, methods of forming a suspension, and methods of forming a sensor. The methods may include contacting one or more carbon nanotubes with a dienophile in the presence of a supercritical fluid to form one or more functionalized carbon nanotubes. The one or more functionalized carbon nanotubes may have a degree of functionalization of about 1% to about 5%.

Disclosed herein is a conductive grease composition that includes a functionalized carbon nanomaterial and/or boron nanomaterial and a base oil. The nanomaterial and base oil forms hydrogen bond network in the disclosed composition. Because of the formed hydrogen bonds, the disclosed grease exhibits enhanced thermal or electrical conductivity. Also disclosed is a method to improve thermal or electrical conductivity of an existing grease composition.

Applicability to a composite material with high purity and high strength, and a material requiring high conductivity or high thermal conductivity is enhanced. The present invention relates to a multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially, wherein a diameter of an outermost wall based on observation of an image by a transmission electron microscope is 3 nm or more and 15 nm or less, and a length based on observation of an image of a scanning electron microscope is 1.0 mm or more, an aggregate of multi-walled carbon nanotubes and a method for preparing the multi-walled carbon nanotube.

An apparatus for performing aspects of manufacturing carbon nanotubes includes a nozzle configured to receive a catalyst precursor solution and a carrier gas, the nozzle including an orifice configured to nebulize the catalyst precursor solution and produce a mist including a mixture of the nebulized catalyst precursor solution and the carrier gas, the nozzle configured to inject the mist directly into a high temperature reaction zone of a reactor. The apparatus also includes an elongated tubular body having a first conduit and a second conduit, and a cooling system configured to regulate a temperature of the catalyst precursor solution and the carrier gas along the length of the tubular body. The first conduit and the second conduit extend along a length of the tubular body, and the length of the tubular body is greater than or equal to a distance from an end of the reactor to the reaction zone.

A corrosion resistant material is described including a substrate, a first material including less than about 90% of an amino group or epoxy group, between about 0.05% and about 50% siloxane, between about 5% and about 80% nanoparticles, microparticles, or macroparticles, and between about 0.1% and about 5% of a first functionalized graphitic material, a second material including less than about 90% of a silyl group, between about 0.05% and about 50% siloxane, between about 5% and about 80% nanoparticles, microparticles, or macroparticles, and between about 0.1% and about 5% of a second functionalized graphitic material, and a third material including less than about 90% of an amino group or epoxy group and a silyl group, between about 0.05% and about 50% siloxane, between about 5% and about 80% nanoparticles, microparticles, or macroparticles, and between about 0.1% and about 5% of a third functionalized graphitic material.

Processes for altering the structure and/or properties of carbon nanomaterials and inorganic nanomaterials, such as boron nitride nanotubes are described. The processes can be used to produce a carbon nanotube product comprising predominantly carbon nanotube (CNTs) having a desired average length. The processes can also be used to fabricate carbon nanodots. The processes can also be used to slice inorganic nanotubes or nanowires. The processes can also be used to form supramolecular fullerene assemblies.

A modified boron nitride nanotube (BNNT) comprising pendant hydroxyl (OH) and amino (NH.sub.2) functional groups covalently bonded to a surface of the BNNT. Aqueous and organic solutions of these modified BNNTs are disclosed, along with methods of producing the same. The modified BNNTs and their solutions can be used to coat substrates and to make nanocomposites.

Described herein are processes and apparatus for the large-scale synthesis of boron nitride nanotubes (BNNTs) by induction-coupled plasma (ICP). A boron-containing feedstock may be heated by ICP in the presence of nitrogen gas at an elevated pressure, to form vaporized boron. The vaporized boron may be cooled to form boron droplets, such as nanodroplets. Cooling may take place using a condenser, for example. BNNTs may then form downstream and can be harvested.