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High pressure Raman and neutron scattering study of carbon blacks and highly oriented pyrolytic graphite is reported. It is found that carbon black particles are composed of graphitic nanocrystallites and amorphous carbon. Pressure-induced order in inter-atomic distances within nanocrystallites is completely reversible. Relative concentration of amorphous carbon decreases slightly with increased pressure...
We use atomic force microscopy (AFM) to characterize the structure of carbon black aggregates. From the images we determine the lateral sizes and the height of the aggregates and from this data we calculate the flatness index. The flatness indices reveal that aggregates generally exhibit anisotropy, in the form of a reduction of aggregate breadth, or flatness, in one direction. The flat sides tend...
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