The purpose of the present invention is to provide a graphene dispersion which has high dispersibility and which is capable of exhibiting high electrical conductivity and ionic conductivity when used as a raw material for producing an electrode material. The present invention provides a graphene dispersion including a graphene, an amine compound having a molecular weight of 150 or less, and an organic solvent, wherein the mass ratio of an amine compound to the graphene is 0.005 or more and 0.30 or less.

The purpose of the present invention is to provide a graphene which has high dispersibility, high electrical conductivity and oxidation resistance namely a graphene which has high electrochemical stability. In order to achieve the above-described purpose, a surface-treated graphene according to the present invention is obtained by having a compound represented by general formula (1) or a neutralized salt thereof adhere to a graphene. In general formula (1), A represents a benzene-based aromatic group with a condensation number of 1-4, which has no phenolic hydroxy group; R.sup.1 represents a direct bond, a divalent hydrocarbon group having 1-12 carbon atoms, or a divalent organic group having 1-12 carbon atoms, which has a structure selected from the group consisting of an ether bond, an ester bond, an alcohol structure and a carbonyl structure; each of R.sup.2 and R.sup.3 independently represents a hydrogen atom, a hydrocarbon group having 1-12 carbon atoms, or an organic group having 1-12 carbon atoms, which has a structure selected from the group consisting of an ether bond, an ester bond, an alcohol structure and a carbonyl structure; and n represents an integer of 1-6.

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The Present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating graphene nanomaterials having a controlled number of atomic layer(s).

The present invention relates to a method for making a Pickering emulsion, the method comprising: exfoliating a non-silicate layered 3D material in a solvent to produce particles of a non-silicate unfunctionalised 2D material; forming a dispersion of the particles of the 2D material in a first liquid phase; adding a second liquid phase; and homogenising the dispersion of the 2D material in the first liquid phase with the second liquid phase to form a Pickering emulsion comprising the first liquid phase, the second liquid phase, and the particles of the 2D material.

An air flow generating device, a graphene dispersion, and a preparation method thereof are provided. The graphene dispersion is formed by a graphene powder and a processing solvent, wherein the graphene in the graphene dispersion has an average diameter of 0.5 m to 1 m, 3 to 5 layers, a solid content of 5% to 50%, and a residue oxygen content less than 1 wt %, and after being left to stand for 12 hours, the graphene dispersion has a distribution concentration increasing from the top section to the bottom section of the storage container, a viscosity of 5000 cps to 8000 cps, and a graphene concentration of 20 wt %.

The present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating boron nitride nanomaterials having a controlled number of atomic layer(s).

Bulk direct transition metal dichalcogenide (TMDC) may have an increased interlayer separation of at least 0.5, 1, or 3 angstroms more than its bulk value. The TMDC may be a bulk direct band gap molybdenum disulfide (MoS2) or a bulk direct band gap tungsten diselenide (WSe.sub.2). Oxygen may be between the interlayers. A device may include the TMDC, such as an optoelectronic device, such as an LED, solid state laser, a photodetector, a solar cell, a FET, a thermoelectric generator, or a thermoelectric cooler. A method of making bulk direct transition metal dichalcogenide (TMDC) with increased interlayer separation may include exposing bulk direct TMDC to a remote (aka downstream) oxygen plasma. The plasma exposure may cause an increase in the photoluminescence efficiency of the TMDC, more charge neutral doping, or longer photo-excited carrier lifetimes, as compared to the TMDC without the plasma exposure.

The present invention provides a carbon material dispersion in which a carbon material is contained at a high concentration in a liquid medium containing an organic solvent but is unlikely to reaggregate and is stably dispersed, and from which various products, such as an ink capable of forming a coating film having excellent electric conductivity, can be formed. This carbon material dispersion contains a carbon material, an organic solvent, and a polymeric dispersant, wherein the polymeric dispersant is a polymer having 3 to 55% by mass of a constituent unit (1) represented by the following formula (1), wherein R represents a hydrogen atom or the like, A represents O or NH, B represents an ethylene group or the like, R.sub.1 and R.sub.2 each independently represent a methyl group or the like, Ar represents a phenyl group or the like, X represents a chlorine atom or the like, and p represents an arbitrary number of repeating units, and the polymeric dispersant has an amine value of 100 mgKOH/g or less and a number average molecular weight of 5,000 to 20,000. ##STR00001##

The Present teachings provide, in part, methods of separating two-dimensional nanomaterials by atomic layer thickness. In certain embodiments, the present teachings provide methods of generating graphene nanomaterials having a controlled number of atomic layer(s).

A method for producing colloidal graphene dispersions comprises the steps of: (i) stirring graphite oxide in an aqueous dispersion medium to form a dispersion; (ii) determining if the dispersion is optically clear in a light microscope at 1000 fold magnification after 1 to 5 hours of stirring, and, if not clear, removing any undissolved impurities in the dispersion, in order to form a colloidal graphene oxide dispersion, or a multi-graphene oxide dispersion, that is optically clear in a light microscope at 1000 fold magnification; and (iii) thermally reducing the graphene oxide, or multi-graphene oxide, in dispersion in the aqueous dispersion medium at a temperature between 120 C. and 170 C. under pressure in order to ensure that the dispersion medium is not evaporated to form a stable colloidal graphene dispersion or a stable multi-graphene dispersion. Using the method used for the preparation of the starting dispersion a graphene or a multi-graphene dispersion is obtained that can be further processed to multi-graphene with larger inter-planar distances than graphite. Such dispersions and multi-graphenes are suitable materials in the manufacturing of rechargeable lithium ion batteries.