The main product in the Krätschmer synthesis of fullerenes is a insoluble amorphous solid called fullerene black. Structural and chemical characterisation allow to conclude that this material contains irregular stacks of bent and planar carbon sheets in large variations of size and bending radius. The chemical reactivity is heterogeneous comprising elements of carbon black chemistry and of fullerene chemistry.
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Werner et al. (1993) studied this question.
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