A polymer composite formed from an epoxy based polymer and an amino-graphene. The epoxy based polymer forms a polymer matrix and the amino graphene is dispersed throughout the polymer matrix. Further, a graphene is functionalized with 3,5-dinitrophenyl groups to form functionalized graphene and one or more amine functional groups form Meisenheimer complexes with the functionalized graphene to form the amino-graphene. An associated method of making the polymer composite is also provided.

The present invention provides a multi-stage filter system suitable for the production of drinking water from a wide variety of contaminated water sources. The modular nature of the multi-stage filter system allows for the customization of filter combinations according to the remediation requirements. The multi-stage filter system comprises a coarse filter (S1); an ultrafiltration filter (S2); a graphene-based filter (S3); and a residual nanoparticle filter (S4). The graphene-based filter cartridge comprises few-layer graphene powder; a combination of few-layer graphene powder and pellets comprising a mixture of polyethersulfone, graphene oxide (GO), and dimethylformamide; a composite comprising chitosan, GO, sodium sulfate and ferric chloride; or a combination of few-layer graphene powder, granular activated carbon and a composite comprising chitosan, GO, sodium sulfate and ferric chloride.

A composite sheet for shielding electromagnetic and radiating heat includes: a first layer formed of metal; and a second layer that is a graphene layer formed on one surface of the first layer and including charged chemically modified graphene such that thermal conductivity and electromagnetic shielding ability are improved while securing economic efficiency by using the second layer including the charged chemically modified graphene and the graphene flakes.

A composite sheet for shielding electromagnetic and radiating heat includes: a first layer formed of metal; and a second layer that is a graphene layer formed on one surface of the first layer and including charged chemically modified graphene such that thermal conductivity and electromagnetic shielding ability are improved while securing economic efficiency by using the second layer including the charged chemically modified graphene and the graphene flakes.

The present invention provides a two-dimensional material nanosheets with a large area and a controllable thickness and a general preparation method therefor. As an intralayer heat transfer coefficient of a two-dimensional material is much higher than an interlayer heat transfer coefficient thereof, the two-dimensional material is uniformly heated and sublimated layer by layer by controlling the energy of the laser pulses, a thinning thickness is controlled by adjusting the action time of the laser pulses, and finally, a two-dimensional material film with a controllable thickness is obtained. At the same time, a sample displacement stage moving freely in a two-dimensional plane space can realize preparation of the two-dimensional material film with a large area. Compared with traditional methods, the present invention can control a sample thickness of the two-dimensional material film, has a high generality, and is suitable for all kinds two-dimensional materials.

The present disclosure describes embodiments of novel methods of few layer graphene exfoliation and stabilization using an effective liquid additive package and laminar shear processing regimen. The liquid additive package serves both as a stabilizer and solvent for milling of the dispersion of graphene in media. The novel methods create suitable functionalities on graphene particles and compatibility between the graphene and polymer, which results in stronger interfacial interaction and complete exfoliation. The complete exfoliation of graphene and substantial interfacial interaction between graphene and the polymer matrix have a significant positive impact on the electrical, thermal, and mechanical properties of the composite. Such positive impacts are due to uniform dispersion and stabilization of graphene throughout the polymer matrix; strong interfacial interaction between graphene particles and polymer chains; and sufficient interstitial separation between graphene particles within the matrix so as to allow for load transfer throughout the composite material.

The present disclosure describes embodiments of novel methods of few layer graphene exfoliation and stabilization using an effective liquid additive package and laminar shear processing regimen. The liquid additive package serves both as a stabilizer and solvent for milling of the dispersion of graphene in media. The novel methods create suitable functionalities on graphene particles and compatibility between the graphene and polymer, which results in stronger interfacial interaction and complete exfoliation. The complete exfoliation of graphene and substantial interfacial interaction between graphene and the polymer matrix have a significant positive impact on the electrical, thermal, and mechanical properties of the composite. Such positive impacts are due to uniform dispersion and stabilization of graphene throughout the polymer matrix; strong interfacial interaction between graphene particles and polymer chains; and sufficient interstitial separation between graphene particles within the matrix so as to allow for load transfer throughout the composite material.

A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.

A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.

Described are devices, such as light emitters, lasers, and switches, and methods, such as methods of generating photoluminescence and methods of fabricating electronic devices. Example devices and methods described include those comprising or employing optically active graphene, such as in the form of one or more layers of quasi-1D graphene nanomaterials or graphene nanostripes including one or more topological defects. Optically active graphene can emit photoluminescence upon exposure to photoexcitation and can also generate laser emission, optionally as a frequency comb. The optically active graphene can be patterned onto substrates according to the disclosed methods of fabricating electronic devices and is optionally useful for generating optical switches.