Provided is filtration member for use in a filtration device, said filtration member comprising a layer of woven or nonwoven fabric having two primary surfaces and a layer of chemically functionalized graphite flakes deposited on at least one of the two primary surfaces or embedded in the layer of woven or nonwoven fabric, wherein said graphite flakes comprise chemical function contain 1%-50% by weight of a non-carbon element selected from O, N, H, F, Cl, Br, I, or a combination thereof. Also provided is a face mask comprising: (a) a mask body configured to cover at least wearer's mouth and nose; and (b) a fastener to hold the mask in place on the wearer's face; wherein the mask body includes (i) an air-permeable outer layer, (ii) an inner layer located on a wearer's side when the mask is worn, and (iii) the filtration member comprising graphite flakes.

The present disclosure provides a method for repairing defect of graphene, including: firstly introducing a composite fluid containing a reactive compound and a supercritical fluid to a reactor where the graphene powder has been placed, and impregnating the graphene powder with the composite fluid to passivate and repair the defect of graphene, wherein the reactive compound includes carbon, hydrogen, nitrogen, silicon or oxygen element; and separating the composite fluid from the graphene powder, simultaneously using molecular sieves to absorb the graphene from the composite fluid. The present disclosure further provides the graphene powder prepared by the method above. With the method of the present disclosure, it effectively reduces the ratio of the defect of the graphene, increases the content of the graphene, and has less-layer graphene with high thermal conductivity and electrical conductivity.

The present disclosure provides a method for manufacturing a graphene-metal composite wire. The method includes: (1) growing graphene on a surface of a metal wire through a chemical vapor deposition process; (2) twisting the wire; (3) pretensioning and pre-straining the wire; (4) cold-drawing the wire; and (5) subjecting the wire to a chemical vapor deposition process, wherein the wire is subjected to steps (2) to (5) successively and cycled n times, wherein f wires obtained in step (1) are used in the first cycle, f wires obtained from previous cycle are used in subsequent cycle, and finally a graphene-metal composite wire with fn strands is obtained, and wherein (a) f is an integer of 2-9; and (b) n is an integer of 6 or more.

Provided is a production method for a carbon-based light-emitting material that generates light having a wavelength of 500 to 700 nm when exposed to excitation light having a wavelength of 300 to 600 nm. The production method comprises a step for mixing and heating a starting material containing ascorbic acid, an acid catalyst containing an inorganic acid, and a solvent.

The invention discloses a photothermal evaporation material integrating light absorption and thermal insulation, comprising a heat insulator and a light absorber that covers the external surface of the heat insulator, the light absorber is vertically-oriented graphene, the heat insulator is a graphene foam, and the vertically-oriented graphene and graphene foam are connected by covalent bonds; the light absorber is vertically-oriented graphene whose surface is modified with hydrophilic functional groups. The invention also discloses a method for fabricating the photothermal evaporation material integrating light absorption and thermal insulation. The invention also discloses a solar energy photothermal seawater desalination device and a high-temperature steam sterilization device. The photothermal evaporation material integrating light absorption and thermal insulation overcomes the problem of easy separation between the light absorber and the heat insulator, realizes rapid and efficient photothermal evaporation, and improves the stability and photothermal conversion efficiency of the solar photothermal seawater desalination device and the high-temperature steam sterilization device.

A method of treating a carbon/carbon composite is provided. The method may include infiltrating a carbonized fibrous structure with hydrocarbon gas to form a densified fibrous structure. The method may include treating the densified fibrous structure with heat at a first temperature range from about 1600 to about 2400 C. to form a heat treated densified fibrous structure. The method may include infiltrating the heat treated densified fibrous structure with silicon to form a silicon carbide infiltrated fibrous structure.

A process for the preparation of reduced graphene comprising the steps of: providing an expandable graphite intercalated with oxygen containing groups; heating the expandable graphite under conditions sufficient to cause expansion of the expandable graphite and formation of an expanded graphite comprising oxygen containing groups; and contacting the expanded graphite with carbon monoxide to reduce at least a portion of the oxygen containing groups and form a reduced expanded graphite comprising an array of reduced graphene. The process of the invention enables large volumes of high quality graphene to be produced.

The invention relates to the field of nano materials, in particular to biomass-based high-efficiency fluorescent graphene quantum dot and preparation method thereof. Method for preparing biomass-based high-efficiency fluorescent graphene quantum dots includes hydrothermal reaction of composite carbon source, nitrogen source, polyvalent metal ion and water. The method for preparing a biomass-based high-efficiency fluorescent graphene quantum dot includes the following steps: (1) Mixing the composite carbon source and the nitrogen source, and then adding water, stirring and dissolving to obtain a mixture A; (2) Adding polyvalent metal ions to the mixture A, and after stirring, heating and reacting to obtain a crude product; (3) The crude product is purified by dialysis to obtain a purified product. The biomass-based high-efficiency fluorescent graphene quantum dot of the invention has the characteristics of high fluorescence intensity, high yield, simple preparation method and wide range of application.

Synthesizing Janus material including forming a lamellar phase having water layers and organic layers, incorporating nanosheets and a functional agent into the lamellar phase, and attaching the functional agent to the nanosheets in the lamellar phase to form Janus nanosheets.

A graphene material has a specific form that has a high dispersibility and can maintain a high electric conductivity and ion conductivity when used as material for electrode manufacturing. A graphene dispersion liquid is provided including graphene dispersed in an organic solvent and meeting both 0.5 mS15 m and 1.0D/S3.0 wherein D is the median diameter (m) of the graphene measured by the laser diffraction/scattering type particle size distribution measurement method and S is the average size (m) in the planar direction of the graphene calculated from the arithmetic mean of the longest diameter and shortest diameter of the graphene observed by a laser microscope.