A non‐destructive method for purifying carbon nanotubes produced by are discharge is described. The nanotubes, in the form of a kinetically stable colloidal dispersion in a water–surfactant solution, are separated from the nanoparticles by filtration. The Figure shows that purified nanotubes after two filtration steps. Through controlled flocculation, nanotube size election is also possible. magnified image
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Bonard et al. (1997) studied this question.
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