Toray Industries, Inc.

Shuko Ikeuchi

Kenichi Sato

Hajime Kato

Masahito Yoshikawa

Hidekazu Nishino

Naoyo Okamoto

Kazuyoshi Higuchi

Shiho Tanaka

Provided is an aggregate of carbon nanotubes wherein a mixture of 10 mg of aggregate of carbon nanotubes, 30 mg of sodium polystyrene sulfonate and 10 mL of water is subjected to ultrasonic homogenizer treatment, subsequently subjected to centrifugal treatment at 20000 G, then 9 mL of supernatant is sampled, and the content of aggregate of carbon nanotubes in the supernatant is 0.6 mg/mL or more. The aggregate of carbon nanotubes of the present invention can provide a dispersion of an aggregate of carbon nanotubes having a high concentration through very good dispersibility.

Carbon nanotube assembly and electrically conductive film

Disclosed is a composition containing carbon nanotubes which meets all of the following conditions (1) to (4). (1) When observed via transmission electron microscopy, at least 50 out of every 100 carbon nanotubes are double-walled carbon nanotubes. (2) The carbon nanotubes have an average outer diameter in the range of 1.0 to 3.0 nm. (3) During thermogravimetric analysis under atmosphere at a temperature increase rate of 10&#xb0; C./minute, a high temperature combustion peak is at 700 to 850&#xb0; C., and the relationship between low temperature weight loss (TG(L)) and high temperature weight loss (TG(H)) is TG(H)/(TG(L)+TG(H))&#x2267;0.75. (4) The composition containing carbon nanotubes has a volume resistance value between 1.0&#xd7;10&#x3a9;&#xb7;cm and 1.0&#xd7;10&#x3a9;&#xb7;cm, inclusive. The disclosed composition containing carbon nanotubes primarily has double-walled carbon nanotubes with high electrical conductivity and high heat resistance.

Composition containing carbon nanotubes, catalyst for producing carbon nanotubes, and aqueous dispersion of carbon nanotubes

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Nagoya, Japan

Shuko Ikeuchi