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H2O2treatment can decrease the electrical resistivity of double walled carbon nanotube fibers. The experimental observations suggest that small diameter carbon nanotubes are removed from the fiber sample.

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High-speed agitation by a mixing blade has efficiently achieved the cutting of a large diameter (100-150 nm) of multi-walled carbon nanotubes. The cutting process is caused by an inter-collision of the nanotubes with high transfer energy. The collision-induced cutting allows for the shortening of the nanotubes without serious damage of the sidewalls due to the cutting effect being limited to the collision points. Furthermore, the operation under ambient atmosphere introduces oxygen-containing functional groups to the cut nanotubes. The estimated length distribution has indicated that high-speed agitation achieves a large cutting effect during a short duration of several minutes.

Nitrogen-enriched activated carbon from silkworm pupae prepared by hydrothermal treatment and chemical activation exhibited superior specific capacitance with excellent cycling stability.