Characterization of Ozone Surface Oxidized Carbon Black Particles

Some kinds of surface oxidized carbon black (CB) particles were prepared by ozone treatment system with different reaction time. The morphological damages on CB, for examples, porous or oxidized amorphous phase structure, were generally formed by other oxidation method, such as acid treatment. Such damages on CB surface after ozone oxidation were not generated by STEM observation. The amount of generated functional group by surface oxidation on CB was determined by the vacuum pyrolysis and TG/MS (thermo-gravimetric and mass spectrometry). The amount of CO from -OH groups and CO2 from -COOH groups during vacuum pyrolysis from surface treated CB increased in proportional to ozone oxidation time. Furthermore, NO and SO2 functional groups on ozone oxidized CB surface were discovered by using TG/MS method. The amount of each functional group increased with increase of ozone oxidizing time, it seems that such functional groups were produced by the reaction with during ozone treatment. TG/MS is useful method for detecting the various functional groups of CB.