Abstract:
A method and system of separating graphene nanoplatelets (GNPs) from initial graphite raw material is disclosed. The raw material is exfoliated to create a percentage of separated GNPs in a resulting bulk mixture. Agglomerates between the separated graphene nanoplatelets are broken. The mixture is separated into fractions having nanoparticles of different GNP content and size distribution. Each different range of nanoparticles is separated into GNPs and graphite nanopowder via a medium flow process or via electrostatic separation or both.
Abstract:
The invention relates to a support for receiving a biological sample, the support comprising at least one support member, and comprising graphene attached to said at least one support member, wherein said graphene is partially hydrogenated graphene. The invention also relates to use of a partially hydrogenated graphene surface to support a biological molecule for electron microscopy. The invention also relates to a method for making a partially hydrogenated graphene, the method comprising applying a hydrogen ion or hydrogen atom to the surface of graphene, hwerein said hydrogen ion or hydrogen atom is applied at an energy in the range 1 to 21 eV. The invention also relates to a sensor comprising a surface capable of adsorbing a biological molecule thereto, wherein said surface comprises partially hydrogenated graphene. The invention also relates to a method for cleaning a graphene surface, comprising contacting said graphene surface with a hydrogen plasma or a helium plasma or a neon plasma for a time sufficient to remove surface impurities.
Abstract:
System and process in which graphene, which may be produced on a commercial scale, is highly purified, then functionalized in a vertical plasma reactor which can also deagglomerate and/or delaminate the graphene, as well as separating or classifying the functionalized graphene particles according to size. In one disclosed embodiment, the graphene is produced by combustion of magnesium (Mg) and carbon dioxide (CO2) in a highly exothermic reaction. The graphene is separated from the other reaction products and purified in a series of washing, heating, and drying steps, following which it is functionalized and otherwise processed in the plasma reactor.
Abstract:
La présente invention concerne un procédé de préparation de graphène sensiblement exempt de contamination par des impuretés métalliques, magnétiques, organiques et inorganiques ainsi que l'utilisation du graphène obtenu par ce procédé pour la réalisation d'électrodes transparentes, de batteries, de matériaux accepteurs ou donneurs d'électrons notamment dans le photovoltaïque, de panneaux photo voltaïques, de canaux de transistors notamment en électronique, d'émetteurs ou absorbeurs non linéaires de photons infrarouge, d'électrodes conductrices de courant, de revêtements antistatiques, de détecteurs chimiques, de vias et interconnections en électronique, de câbles de conduction du courant, et de cellules solaires.
Abstract:
Graphene layers, hexagonal boron nitride layers, as well as other materials made of primarily sp2 bonded atoms and associated methods are disclosed. In one aspect, for example, a method of forming a graphene layer is provided. Such a method may include mixing a carbon source with a horizontally oriented molten solvent, precipitating the carbon source from the molten solvent to form a graphite layer across the molten solvent, and separating the graphite layer into a plurality of graphene layers.
Abstract:
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.
Abstract:
A method of producing graphene comprises forming a composition comprising magnesium and carbon, and isolating graphene from the composition. The isolated graphene is crystalline.