▎ 摘　　要

NOVELTY - A graphene dispersion comprises: (a) 29-150 mg.ml-1graphene nanoplatelets; (b) 1-50 mg.ml-1graphene oxide nanoplatelets; and (c) water. USE - Graphene dispersion in the form of additive is useful for introducing graphene into compositions such as concrete. ADVANTAGE - The graphene dispersions are stable for more than 6 months, permitting them to be added in a concrete batching plant. The dispersion is free of surfactants. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of making a graphene dispersion, which involves (i) mixing graphene oxide nanoplatelets, or a graphene oxide precursor material, with water, (ii) mixing at high shear of at least 4000 revolutions per minute for at least 15 minutes, (iii) adding graphene nanoplatelets, or a graphene precursor material, and (iv) mixing at high shear at of at least 4000 revolutions for at least 15 minutes, where the above steps are carried out in the order (i), (ii), (iii), (iv) or (iii), (iv), (i), (ii).