Purification and production of Organic Graphene Dispersions (OGD)
Once the residual graphite has been removed, a graphenide solution is obtained. It is composed of small, negatively charged graphene sheets dispersed in an organic solvent.
This solution is then oxidized to produce organic graphene dispersions, which can be transferred into water to produce a highly stable aqueous graphene dispersion, after evaporation of the solvent, or into a matrix: this is the enrichment step. At the end of the process, the solvent is recovered, recycled and reused.