Toray Industries, Inc.

California Institute of Technology

Toudai Tlo, Ltd.

Masahito Yoshikawa

Hajime Kato

Kazuyoshi Iwayama

Kenichi Sato

Mark E Davis

Shigeo Maruyama

Shinichi Sakaguchi

Naoyuki Uchiyama

Masatoshi Watanabe

Takashi Taniguchi

Keisuke Fujita

Naoyo Okamoto

Masayuki Maeda

Shuko Ikeuchi

Kazuyoshi Higuchi

Yuji Ozeki

Shuko Numata

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

Provided is an aggregate of carbon nanotubes satisfying (1) there is a 2&#x3b8; peak at 24&#xb0;&#xb1;2&#xb0; by X-ray powder diffraction analysis; (2) a height ratio (G/D ratio) of G band to D band by Raman spectroscopic analysis of wavelength 532 nm is 30 or more; and (3) a combustion peak temperature is from 550&#xb0; C. to 700&#xb0; C. The present invention provides an aggregate of carbon nanotubes excellent in dispersibility while high quality, giving a film, molded article, membrane or the like having excellent characteristics.

Aggregate of carbon nanotubes, dispersion thereof and conductive film using the same

An atmosphere of a carbon source comprising an oxygenic compound is brought into contact with a catalyst with heating to yield single-walled carbon nanotubes. The carbon source comprising an oxygenic compound preferably is an alcohol and/or ether. The catalyst preferably is a metal. The heating temperature is preferably 500 to 1,500&#xb0; C. The single-walled carbon nanotubes thus obtained contain no foreign substances and have satisfactory quality with few defects.

Composition containing single-walled nanotubes

An atmosphere of a carbon source comprising an oxygenic compound is brought into contact with a catalyst with heating to yield single-walled carbon nanotubes. The carbon source comprising an oxygenic compound preferably is an alcohol and/or ether. The catalyst preferably is a metal. The heating temperature is preferably 500 to 1,500&#xb0; C. The single-walled carbon nanotubes thus yield contain no foreign substances and have satisfactory quality with few defects.

Process for producing single-walled carbon nanotube, single-walled carbon nanotube, and composition containing single-walled carbon nanotube

Provided is a method for producing a carbon nanotube, wherein a catalyst for carbon nanotube production comprising a powdery catalyst supporting a metal on magnesia and having a bulk density of 0.30 g/mL to 0.70 g/mL, in a vertical reactor, is disposed over the whole area in a horizontal cross section direction of the reactor, in such state a carbon-containing compound flowed in a vertical direction inside the reactor is contacted with the catalyst at 500 to 1200&#xb0; C., thereby carbon nanotubes of uniformity and high quality are efficiently synthesized in a large amount.

Process for producing carbon nanotube and catalyst for carbon nanotube production

A process for conversion of organic compounds including contacting a catalyst formed from a CFI-type zeolite including an atomic ratio of silicon to a heteroatom of 45 or less, and long axes of crystals of 0.7 &#x3bc;m or less with the organic compounds.

Process for conversion of organic compounds

Method of converting aromatic compound

A CFI-type zeolite where the atomic ratio of silicon to the heteroatom is 45 or less and the long axes of the crystals are 0.7 &mgr;m or less is useful as a catalyst for conversion reaction of aromatic compounds because the zeolite has a number of active sites and small crystals.

CFI-type zeolite, process for preparation of the same, catalyst prepared from the same, and process for conversion of organic compounds

Permeable membrane and method

An adsorbent which comprises a zeolite containing Cs and/or Rb, said zeolite being characterized by that the ratio of &lsqb;the number of moles of Cs and/or R in the zeolite&rsqb; to &lsqb;the number of moles of Al in the zeolite&rsqb; is 0.1 or less. This adsorbent permits efficient separation of an isomer from a mixture of aromatic isomers.

Adsorbent for aromatic isomers and production of aromatic isomers

The present invention relates to new crystalline zeolite CIT-5 prepared using a N(16) methylsparteinium cation templating agent.

Growing community of inventors

Nagoya, Japan

Masahito Yoshikawa