showed picture of nanographite dispersions prepared from 6,12,36, and 72 hours of sonication. the color of the dispersions became daeker for longer time of sonication because it enhanced the concentration of nanographite in the dispersion. sonication time also affected the homogencity and sedimentation of the nanographite suspensions. the suspension from the sonication times of 36 and 72 hours stayed stable,e.g. without aggregation, for more than 3 month