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Carbon nanotube capsules self-assembled by w/o emulsion technique.

Carbon nanotube capsules (CNCs) with the diameter of 5-10 microm were fabricated from acid-modified multiwalled carbon nanotubes (CNTs) using water-in-oil (W/O) emulsion technique. The effects of the content of CNTs in water, the extent of acid treatment, and the length of CNTs used on the formation and morphology of CNCs were investigated. It was found that the amount of CNTs in water and the length of CNTs are the crucial factors for the formation of carbon nanotube capsules.