The embodiments of the present disclosure relate to a method and apparatus for producing a carbon nanomaterial product (CNM) product that may comprise carbon nanotubes and various other allotropes of nanocarbon. The method and apparatus employ a consumable carbon dioxide (CO.sub.2) and a renewable carbonate electrolyte as reactants in an electrolysis reaction in order to make CNTs. In some embodiments of the present disclosure, operational conditions of the electrolysis reaction may be varied in order to produce the CNM product with a greater incidence of a desired allotrope of nanocarbon or a desired combination of two or more allotropes.

The embodiments of the present disclosure relate to a method and apparatus for producing a carbon nanomaterial product (CNM) product that may comprise carbon nanotubes and various other allotropes of nanocarbon. The method and apparatus employ a consumable carbon dioxide (CO.sub.2) and a renewable carbonate electrolyte as reactants in an electrolysis reaction in order to make CNTs. In some embodiments of the present disclosure, operational conditions of the electrolysis reaction may be varied in order to produce the CNM product with a greater incidence of a desired allotrope of nanocarbon or a desired combination of two or more allotropes.

A method for producing a carbon nanomaterial (CNM) product comprises: heating an electrolyte media to obtain a molten electrolyte media; positioning the molten electrolyte media between an anode and a cathode of an electrolytic cell, in which the anode comprises a noble metal and the cathode comprises copper and nickel; introducing a source of carbon into the electrolytic cell; introducing a nickel-containing additive into the electrolyte media before the step of heating or introducing the nickel-containing additive into the molten electrolyte media, in which the iron-free additive is added in an amount of between 0.05 wt % and 2 wt %, relative to the amount of the electrolyte media or the molten electrolyte media; applying an electrical current to the cathode and the anode in the electrolytic cell; and collecting the CNM product from the cathode.

A method for making a carbon nanotube array includes providing a substrate having a first substrate surface and a second substrate surface opposite to the first substrate surface. The substrate has a plurality of through holes spaced from each other, and each of the plurality of through holes extends from the first substrate surface to the second substrate surface. A catalyst layer is deposited on the first substrate surface, to form a composite structure. The composite structure is placed in a chamber. The carbon source gas and protective gas are supplied to the chamber, and the composite structure is heated to a first temperature, to grow a carbon nanotube array on the first substrate surface.

The embodiments of the present disclosure relate to a method, system and composition producing a magnetic carbon nanomaterial product that may comprise carbon nanotubes (CNTs) at least some of which are magnetic CNTs (mCNTs). The method and apparatus employ carbon dioxide (CO.sub.2) as a reactant in an electrolysis reaction in order to make mCNTs. In some embodiments of the present disclosure, a magnetic additive component is included as a reactant in the method and as a portion of one or more components in the system or composition to facilitate a magnetic material addition process, a carbide nucleation process or both during the electrosynthesis reaction for making magnetic carbon nanomaterials.

A method for producing a carbon nanomaterial (CNM) product includes: heating an electrolyte media to obtain a molten electrolyte media; positioning the molten electrolyte media between a high-nickel content anode and a cathode of an electrolytic cell; introducing a source of carbon into the electrolytic cell; applying an electric current to the cathode and the anode in the electrolytic cell; and collecting the CNM product from the cathode, in which the CNM product comprises a minimal relative-amount of at least 70 wt %, as compared to a total weight of the CNM product, of hollow nano-onion product, in which the high-nickel content anode is made of pure nickel or an alloy that comprises greater than 50 wt % nickel.

A nanofiber sheet is described that is composed of a substrate and a layer of oriented nanofibers. Nanofibers of the sheet can be oriented in a common direction. In some orientations, light absorbent sheets can absorb over 99.9%, and in some cases over 99.95%, of the intensity of light incident upon the sheet. Methods for fabricating a light absorbent sheet are also described.

This present invention relates to oxidized, discrete carbon nanotubes in dispersions, especially for use in printing inks. The dispersions can include materials such as elastomers, thermosets and thermoplastics or aqueous dispersions of open-ended carbon nanotubes with additives. A further feature of this invention relates to the development of a dispersion of oxidized, discrete carbon nanotubes that are electrically conductive.

The present invention relates to a method for producing large-diameter, low-density carbon nanotubes. The method uses a catalyst containing spherical -alumina that is capable of controlling the growth of carbon nanotubes without deteriorating the quality of the carbon nanotubes. The use of the catalyst makes the carbon nanotubes highly dispersible.

Provided is an electrode mixture layer capable of reducing internal resistance by use of a carbon nanotube molding. The electrode mixture layer includes an active material and a conductor of carbon nanotubes in close contact with the surface of the active material, and the number density of the carbon nanotubes is 4 tubes/m or more. The number density is defined as a value obtained by providing measurement lines on a scanning electron microscope image of a surface of the electrode mixture layer at 0.3 m intervals both longitudinally and laterally, measuring the total number of the carbon nanotubes being in close contact with the surface of the active material and intersecting the measurement lines, and dividing the total number of the carbon nanotubes by the total length of the measurement lines on the active material surface.