The structural characterization of single-walled carbon nanotubes is evaluated after careful purification, disentanglement, oxidation, and base treatments. The analyses confirm a small weight percent of non-nanotube material is present, that can be effectively removed with base. The resulting nanotubes remain soluble in water due to oxidized sidewalls and are dramatically shorter after oxidation.
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Price et al. (2009) studied this question.
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