There are provided a graphene having an oxygen atom content in a predetermined range or less and a carbon/oxygen weight ratio in a specific range to show excellent electrical and thermal conductivity properties, and a barrier property, and a method and an apparatus for preparing the graphene having excellent electrical and thermal conductivity properties and a barrier property by using a subcritical-state fluid or a supercritical-state fluid. According to the method and the apparatus for preparing the graphene, impurities such as graphene oxide, and the like, may be effectively removed, such that uniformity of the graphene to be prepared may be increased, and therefore, the graphene which is highly applicable as materials throughout the industry may be mass-produced.

A graphene quantum dots synthesis method includes fixing a graphene aqueous solution or a graphene oxide aqueous solution on a spin coater to spin the graphene aqueous solution or the graphene oxide aqueous solution, and irradiating a pulsed laser to focus on a graphene aqueous solution or a graphene oxide aqueous solution to generate exfoliation. After a processing period, quantum dots are generated in the graphene aqueous solution or the graphene oxide aqueous solution. Since graphene aqueous solution or graphene oxide aqueous solution does not contain organic chemistry pharmacy, the quantum dots synthesized by the method of the present invention can be produced without pollution. Furthermore, the purpose of simple process, low cost, and time-saved of synthesis can be achieved.

A system and a method of continuously separating submicron thickness laminar solid particles from a solid suspension, segregating the suspension into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising the steps of; providing a continuous centrifuge apparatus; providing a suspension of submicron thickness laminar solid particles in a solid suspension; wherein the solid suspension comprises the submicron thickness solid particles in a liquid continuous phase; separating the solid suspension in the apparatus.

A system and a method of continuously separating submicron thickness laminar solid particles from a solid suspension, segregating the suspension into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising the steps of; providing a continuous centrifuge apparatus; providing a suspension of submicron thickness laminar solid particles in a solid suspension; wherein the solid suspension comprises the submicron thickness solid particles in a liquid continuous phase; separating the solid suspension in the apparatus.

A variety of inorganic-organic hybrid materials and various methods for preparing and using the same are described. The hybrid materials are graphene or graphitic materials populated with organic molecules and may have a variety of surface defects, pits or three-dimensional architecture, thereby increasing the surface area of the material. The hybrid materials may take the form of three dimensional graphene nanosheets (3D GNS). If the organic molecules are enantiospecific molecules, the hybrid materials can be used for chiral separation of racemic mixtures.

A graphene product obtained from Graphene Nanofibers (GNFs), having a modified crystal structure and a defined size distribution. The product is non toxic and has useful biological properties such as modification of the adipocytes phenotype. The product can be used in cosmetics.

A graphene product obtained from Graphene Nanofibers (GNFs), having a modified crystal structure and a defined size distribution. The product is non toxic and has useful biological properties such as modification of the adipocytes phenotype. The product can be used in cosmetics.

Provided herein are methods, devices and systems for processing of carbonaceous compositions. The processing may include the manufacture (or synthesis) of oxidized forms of carbonaceous compositions and/or the manufacture (or synthesis) of reduced forms of oxidized carbonaceous compositions. Some embodiments provide methods, devices and systems for the manufacture (or synthesis) of graphite oxide from graphite and/or for the manufacture (or synthesis) of reduced graphite oxide from graphite oxide.

Provided herein are methods, devices and systems for processing of carbonaceous compositions. The processing may include the manufacture (or synthesis) of oxidized forms of carbonaceous compositions and/or the manufacture (or synthesis) of reduced forms of oxidized carbonaceous compositions. Some embodiments provide methods, devices and systems for the manufacture (or synthesis) of graphite oxide from graphite and/or for the manufacture (or synthesis) of reduced graphite oxide from graphite oxide.

A method for enrichment of a mixture of graphene nanoplatelets (GNP) may include providing GNP into a column. The method may also include passing the GNP through an electrostatic field in a drift column to separate thinner GNP from thicker GNP to increase the content of the thinner GNP. The method may further include coupling a feeder to the drift column to accept the GNP and providing electrical charge to the GNP by the drift column with a charging module. The method may still further include generating the electrostatic field with an electrostatic field generator in the drift column to increase the content of GNP with smaller thickness.