Zeon Corporation

National Institute of Advanced Industrial Science and Technology

Akiyoshi Shibuya

Kenji Hata

Motoo Yumura

Keiichi Kawata

Kohei Arakawa

Toshihide Murakami

Mitsugu Uejima

Masahiko Hayashi

Tomoko Yamagishi

Megumi Fujita

A carbon nanotube assembly satisfies at least one of the following conditions (1) to (3): (1) an FT-IR spectrum of a CNT dispersion obtained by dispersing the CNT assembly has a peak based on plasmon resonance of the CNTs in a wave number range of greater than 300 cmand 2000 cmor less; (2) the highest peak in a differential pore capacity distribution of the CNT assembly is located within a pore size range of more than 100 nm and less than 400 nm; and (3) a two-dimensional spatial frequency spectrum of an electronic micrographic image of the CNT assembly has at least one peak within a range of 1 μmor more and 100 μmor less.

Carbon nanotube assembly and production method of the same

A production method for growing a carbon nanotube assembly on a substrate having a catalyst on a surface thereof. In this production method, in each of a formation unit that carries out a formation step of reducing a catalyst on the substrate and a growth unit that carries out a growth step of growing a carbon nanotube assembly, the substrate is continuously being conveyed using conveyance units that convey the substrate by screw rotations. In carrying out the formation step and the growth step, these steps are carried out while the gas environments in these steps are prevented from mixing with each other.

Production method of carbon nanotube assembly

A method of producing a carbon nanostructure is provided that enables production of a high-quality carbon nanostructure with a high yield. The method of producing a carbon nanostructure includes supplying a feedstock gas to a catalyst and growing a carbon nanostructure by chemical vapor deposition. A gas X that is derived from the feedstock gas and that comes into contact with the catalyst contains a hydrocarbon A having at least one cyclopentadiene skeleton and a hydrocarbon B having at least one acetylene skeleton. A total volume concentration [A] of the hydrocarbon A is at least 0.06%.

Method of producing carbon nanostructures, and carbon nanotubes

An apparatus of the present invention for producing an aligned carbon nanotube includes: at least one injection section including at least one injection hole from which a raw material gas is injected to a base substrate; an exhaust vent for exhausting the raw material gas; and an exhaust section including a plurality of exhaust vents, the plurality of exhaust vents being provided so as to be closer to the exhaust vent than a plurality of injection holes included in the at least one injection hole of the at least one injection section.

Device for manufacturing and method for manufacturing oriented carbon nanotube aggregates

This method improves a carbon nanotube growth environment. In this method of manufacturing carbon nanotubes, the supply amount of catalyst activating material supplied in a carbon nanotube growing step is adjusted to the supply amount of catalyst activating material supplied at the time of maximum concentration of a gas component among multiple measurements made in the growing step, the gas component being at least one selected from the group consisting of hydrogen, methane, and ethane.

Method of manufacturing carbon nanotubes

Provided is a production apparatus () for continuously producing aligned carbon nanotube aggregates on a substrate supporting a catalyst while continuously transferring the substrate. The production apparatus () includes gas mixing prevention means () for preventing gas present outside a growth furnace () from flowing into the growth furnace (). The gas mixing prevention means () includes a seal gas ejection section () so that the seal gas does not flow into the growth furnace through the openings of the growth furnace. The production apparatus prevents the outside air from flowing into the production apparatus, uniformly controls, within a range suitable to production of CNTs, a concentration distribution(s) and a flow rate distribution(s) of a raw material gas and/or a catalyst activation material on the substrate, and does not disturb gas flow as much as possible in the growth furnace.

Method for producing aligned carbon nanotube assembly

An apparatus of the present invention for producing aligned carbon nanotube aggregates is an apparatus for producing aligned carbon nanotube aggregates, the apparatus being configured to grow the aligned carbon nanotube aggregate by: causing a catalyst formed on a surface of a substrate to be surrounded by a reducing gas environment constituted by a reducing gas; heating at least either the catalyst or the reducing gas; causing the catalyst to be surrounded by a raw material gas environment constituted by a raw material gas; and heating at least either the catalyst or the raw material gas, at least either an apparatus component exposed to the reducing gas or an apparatus component exposed to the raw material gas being made from a heat-resistant alloy, and having a surface plated with molten aluminum.

Apparatus for producing aligned carbon nanotube aggregates

The disclosed method of manufacturing carbon nanotubes includes the steps of growing CNTs on a substrateand cleaning the inside of a growth furnaceby supplying a cleaning gas that contains water into the growth furnace. In the cleaning step, the cleaning is performed such that 0.7&#x2266;(2[CO]+[CO])/[H]&#x2266;1.3 is satisfied, where [H], [CO], and [CO] denote the concentrations of hydrogen, carbon dioxide, and carbon monoxide, respectively, in a gas within the growth furnace

Device for manufacturing aligned carbon nanotube assembly

An apparatus of the present invention for producing an aligned carbon-nanotube aggregate is an apparatus for producing an aligned carbon-nanotube aggregate by synthesizing the aligned carbon-nanotube aggregate on a base material having a catalyst on a surface thereof, the apparatus including: a formation unit that processes a formation step of causing an environment surrounding the catalyst to be an environment of a reducing gas and heating at least either the catalyst or the reducing gas; a growth unit that processes a growth step of synthesizing the aligned carbon-nanotube aggregate by causing the environment surrounding the catalyst to be an environment of a raw material gas and by heating at least either the catalyst or the raw material gas; and a transfer unit that transfers the base material at least from the formation unit to the growth unit. Thus provided is a production apparatus and a production method that are capable of improving efficiency in the production of aligned CNT aggregates by preventing a decrease in production volume and deterioration in quality of aligned CNT aggregates in serial production and by making it easy to increase the size of the apparatus.

Apparatus and method for producing aligned carbon-nanotube aggregates

A lengthy grid polarizer film comprising a lengthy resin film and a plurality of grid lines provided on the surface and/or inside of the resin film and extending substantially in parallel with each other are provided, the grid lines being made of a material G being 1.0 or more in the absolute value of the difference between the real part nand the imaginary part &#x3ba;of the complex refractive index (N=n&#x2212;i&#x3ba;), said resin film having a plurality of rows of grooves formed extending substantially in parallel with each other on its surface, and said grid line being made of a thin film of the laminated material G on the bottom face of the grooves and/or on the top face of ridges located between the adjacent grooves. A lengthy optical laminated body comprises the lengthy grid polarizer film and another lengthy polarizing optical film.

Growing community of inventors

Tokyo, Japan

Akiyoshi Shibuya