▎ 摘　　要

NOVELTY - Preparing stable aqueous dispersion of graphene comprises e.g. dispersing the graphene into water to prepare a dispersion, sampling the dispersion, measuring the corresponding zeta potential of dispersion at different pH values, where the pH value-zeta potential curve of dispersion, judging charge performance of graphene surface according to pH value-zeta potential curve, if the charge performance is negative, using the anionic surfactant, If charge property is positive, taking from cationic surfactant, sampling the dispersion, adding surfactant into dispersing liquid in the sample. USE - The method is useful for preparing stable aqueous dispersion of graphene (claimed). ADVANTAGE - The method makes disperse graphene dispersion achieve a more stable, and good dispersion state. DETAILED DESCRIPTION - Preparing stable aqueous dispersion of graphene comprises (i) dispersing the graphene into water to prepare a dispersion, (ii) sampling the dispersion, measuring the corresponding zeta potential of dispersion at different pH values, where the pH value-zeta potential curve of dispersion, (iii) judging the charge performance of the graphene surface according to pH value-zeta potential curve, if the charge performance is negative, using the anionic surfactant, If the charge property is positive, taking from cationic surfactant, (iv) sampling the dispersion, adding the surfactant into the dispersing liquid in the sample, carrying out dispersion treatment to obtain dispersion system sample, adjusting the pH value of the dispersing system sample, measuring sample zeta potential of dispersed system under the condition of different pH, dispersing the zeta potential-pH value curve of the dispersing system sample, analyzing the zeta potential-pH value curve with stable pH value range, If the zeta potential-pH value curve does not form a stable pH range of the dispersion state, removing the surfactant, using other surfactant, continuously repeating the step until the zeta potential-pH value curve to form stable dispersed state of pH range, and (v) adding the final selected suitable surfactant into the residual dispersion, and then adjusting the pH of the dispersion system to near maximum zeta potential, and carrying out dispersion processing to the distributed system by acid/alkali regulator, obtaining the stable aqueous dispersion liquid of graphene.