EFFECT OF OXIDATION ON THE MICROSTRUCTURE OF CARBON-BLACKS

The evolution during oxidation of the internal structure of soot and c arbon black particles was studied using high-resolution transmission e lectron microscopy (HRTEM) and an image analysis system. Increasing or dering to the carbon structure with increasing oxidation is observed. Measures of the increased order are increases in the fractional covera ge of a cross section of the particles with a layered structure, a dec rease in the mean interlayer spacing, and a decrease in the spread of the interlayer spacing. The changing structure of the carbon black imp acts its properties, such as the rate of oxidation.