Figure 1

Morphology characterization of starting carbon black (CBs) and oxidized carbon black (OCBs). SEM (a,b and c) and TEM (d,e and f) images of the CBs (a and d) and the OCBs obtained from reactions at the CBs to KMnO₄ weight ratios of 0.5:6 (b and e) and 0.3:6 (c and f).