Effects of ultrasonic treatment on aqueous suspensions of diamond nanopowders

It has been found that ultrasonic treatment of diamond nanopowders contributes to surface cleaning due the removal non-diamond carbon and impurities from boundary nanodiamond grains (from 0.4 0.32 % for ASUD-99 0.67 0.55 ASUD 75, respectively). does not affect total sorption volume values specific studied samples do change, but it changes composition groups on nanoparticles, which its hydrophilicity. In АSUD-75 after treatment, a redistribution ratio intensities valence vibrations С=О bonds in lactone (anhydride) group (1742 cm–1) quinone (carboxyl) (1683 is observed, indicates decay ring transformation into carbonyl carboxyl groups. All АSUD-99 have hydroxyl O-H (3400 cm−1), change significantly under influence ultrasound. This explains noticeable agglomeration ASUD-75 contrast 99.