Patent ID: 9114405
Filing Date: 2015-08-25
Classification: B01D,B03D,B82Y,C01B,C01G,C01P,C08G,C08L,Y10S,Y10T

Abstract:
1. A method for separating graphene nanomaterials by thickness, the method comprising: sonicating pristine graphite in a first fluid medium to provide a graphene composition; centrifuging the graphene composition in contact with an aqueous second fluid medium comprising a density gradient, wherein the graphene composition comprises one or more surface active components and a polydisperse population of graphene nanomaterials comprising monolayer graphene, bilayer graphene, trilayer graphene, and n-layer graphene, wherein n is an integer in the range of 4 to 10; and separating the graphene composition into two or more separation fractions each comprising a subpopulation of graphene nanomaterials from the polydisperse population, wherein the subpopulation in at least one of the two or more separation fractions comprises greater than 50% of monolayer graphene, bilayer graphene, trilayer graphene, or combinations thereof.