Methods for preparation of concentrated graphene compositions and related composite materials
A rapid, scalable methodology for graphene dispersion with a polymer-organic solvent solution and subsequent solvent exchange, as can be utilized without centrifugation, to enhance graphene concentration.
1. A method for concentrating a graphene medium, said method comprising:
exfoliating a graphene source material with a medium comprising an organic solvent selected from ethanol and dimethylformamide, and an ethyl cellulose;
contacting at least a portion of said exfoliated graphene medium with a terpineol; and
hydrating said graphene-terpineol medium to concentrate exfoliated graphene in said terpineol.
2. The method of claim 1 wherein said graphene source material is a graphite.
3. The method of claim 1 comprising iterative separation of said graphene-terpineol medium from said organic solvent and contact with another portion of said exfoliated graphene-terpineol medium, to provide a graphene ink composition.