▎ 摘　　要

NOVELTY - Fractionating (M1) and isolating components of oxidized graphene material, comprises: (a) fractionating a system including graphene oxide, a solvent and water, where the fractionation creates two phases or fractions of (i) a water phase or fraction comprising highly oxidized graphene oxide and (ii) a solvent-in-water emulsion phase or fraction comprising a graphene-based material; and (b) recovering the graphene-based material from the solvent-in-water phase or fraction. USE - The method (M1) is useful for fractionating and isolating components of oxidized graphene material, where the oxidized graphene material is useful for forming a polymer hydrogel mixture (claimed). ADVANTAGE - The method (M1): provides the oxidized graphene material that exhibits effective processability, high levels of exfoliation as compared to graphite and low level of defects as compared to conventional reduced graphite oxide; provides the oxidized graphene material that exhibits improved mechanical strength, thermal conductivity and electrical conductivity and rather than reducing an entire batch of GO, thus allowing isolation of graphene oxide sheets with only small quantities of oxidation and allows downstream processing capabilities and exhibits high level of exfoliation as compared to conventional reduced graphite oxide; provides the oxidized graphene material that is fully oxidized and never had the damage encountered with conventional reduced graphene oxide synthesis; utilizes the fractionation process which is much safer than conventional reduced graphene oxide synthesis by thermal or chemical reaction; is cost-effective by utilizing oil solvent e.g. chloroform, toluene and benzene, and water for e by utilizing oil solvent e.g. chloroform, toluene and benzene, and water for processing as compared to the large quantities of reducing agents e.g. hydrazine, needed to form conventional reduced graphene oxide, thus saving the cost; and yields graphene-based material faster than methods for synthesis of conventional reduced graphene oxide due to no purification step involved as compared conventional reduced graphene oxide processing involves expensive, difficult and time consuming purification steps, thus saving time. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a graphene-based material (uGO) recovered or separated from the solvent-in-water phase or fraction isolated according to the method (M1); and (2) forming (M2) a polymer hydrogel mixture, comprising (a) mixing deionized water, heptane, hydroxymethyl acrylamidN-tetramethylethylenediamine, and a graphite oxide (GO) or uGO fraction, and (b) storing the mixture at 40 degrees C overnight, where an emulsion is formed that is stabilized by GO or uGO.