National Institute of Advanced Industrial Science and Technology

Zeon Corporation

Tohoku University

Kenji Hata

Motoo Yumura

Don N Futaba

Sumio Iijima

Akiyoshi Shibuya

Takeo Yamada

Seisuke Ata

Keiichi Kawata

Shigeki Tomonoh

Yuuhei Hayamizu

Satoshi Yasuda

Kazufumi Kobashi

Mitsugu Uejima

Kohei Arakawa

Masaaki Komatsu

Kinji Asaka

Matsuhiko Nishizawa

The Ban Hoang

Ken Mukai

Hiroaki Hatori

Atsuko Sekiguchi

Hirokazu Takai

Chandramouli Subramaniam

Takeo Miyake

Syuhei Yoshino

Anna Komatsu

Hidekazu Nishino

Osamu Tanaike

Provided is a cross-linked rubber that can improve long-term sealing properties of a seal member in high-temperature and high-pressure environments. The cross-linked rubber is obtained through cross-linking of a cross-linkable rubber composition containing a fluororubber, carbon black, one or more carbon nanotubes, and an organic peroxide cross-linker, and has a 50% modulus of 5 MPa or more, a compression set (230&#xb0; C., 500 hours) of 80% or less, and a rate of change of elongation at break between before and after a heat aging test (230&#xb0; C., 72 hours) of not less than &#x2212;10% and not more than 10%.

Cross-linked rubber and production method therefor

The present invention is a carbon nanotube aggregate having a three-dimensional shape. The carbon nanotube aggregate having a three-dimensional shape includes a first surface, a second surface and a side surface, wherein a carbon nanotube of the first surface has a Herman orientation coefficient greater than &#x2212;0.1 and smaller than 0.2, a carbon nanotube of the second surface has a Herman orientation coefficient greater than &#x2212;0.1 and smaller than 0.2, and a carbon nanotube of the side surface has degree of orientation in which a Herman orientation coefficient is 0.2 or more and 0.99 or less, and the first surface and second surface are mutually arranged in parallel and the side surface is perpendicular with respect to the first surface and second surface.

Carbon nanotube aggregate, carbon nanotube aggregate having a three-dimensional shape, carbon nanotube molded product using the carbon nanotube aggregate, composition, and carbon nanotube dispersion liquid

A carbon nanotube-elastomer composite material according to the present invention is produced by dispersing a carbon nanotube in an elastomer, including a carbon nanotube having a diameter of 20 nm or less, the number of layers of 10 or less, the carbon nanotube being contained in an amount of 0.1 to 20 parts by weight inclusive relative to the total weight of the carbon nanotube and the elastomer, and a continuous network having a Va/Vvalue of 0.5 or more is formed in the elastomer wherein Vrepresents the initial volume of the composite material and Va represents the volume of the structure formed from the remaining carbon nanotubes when the composite material is maintained at a temperature of 400&#xb0; C. or higher for 6 hours while introducing nitrogen, the elastomer is thermally decomposed and the remaining carbon nanotubes form a structure.

Carbon nanotube-elastomer composite material, seal material and sealing material each produced using same, and method for producing carbon nanotube-elastomer composite material

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

A CNT dispersion liquid of the preset invention includes a CNT agglomerate arranged with a mesh body formed from a plurality of CNTs, the CNT agglomerate being dispersed in a dispersion medium is provided wherein a CNT agglomerate is obtained by extracting from the dispersion liquid and drying the CNT agglomerate the obtained CNT agglomerate has a pore size of 0.02 &#x3bc;m or more and 2.0 &#x3bc;m or less being maximized a differential pore volume in a pore size range of 0.002 &#x3bc;m or more and 10.00 &#x3bc;m or less measured using a mercury intrusion porosimeter.

CNT dispersion solution, CNT compact, CNT composition, CNT aggregate, and method of producing each

Provided are: an elastomer structure containing carbon nanotubes; and a method for producing the elastomer structure. In a CNT elastomer having a mesh shaped carbon nanotube aggregate on a surface layer thereof, the mesh shaped carbon nanotube aggregate can impart a shape-retaining property to the elastomer. Therefore, the elastomer can be molded along the shape of a mold, and it becomes possible to mold a carbon nanotube elastomer having a fine dimension. The elastomer structure containing carbon nanotubes according to the present invention is provided with mesh shaped carbon nanotube aggregate which are embedded in a surface layer of the elastomer structure containing carbon nanotubes and are not protruded from the surface of the elastomer structure containing carbon nanotubes.

Elastomer structure containing carbon nanotubes and method for producing the same

A CNT metal composite material is provided depositing a metal into a plurality of CNTs is provided including 3% by weight or more and 70% by weight or less of the CNTs, a region is arranged with the metal uniformly distributed in a scanning electron microscope image magnified ten thousand times and the length of the region is at least 1 &#x3bc;m, a signal of the metal and a signal of carbon are not localized in a specific area in a two-dimensional elemental analysis image magnified ten thousand times, and a length of a region uniformly distributing the signal of the metal and the signal of carbon uniformly distributed is at least 1 &#x3bc;m, an allowable current density is at 6&#xd7;10A/cmor more, and volume resistivity is 1&#xd7;10&#x3a9;&#xb7;cm or more and 5&#xd7;10&#x3a9;&#xb7;cm or less.

CNT metal composite material, and method for producing same

Provide is a carbon nanotube composite material and conductive material to solve the problems of the prior art described above by providing a high conductivity and showing excellent durability against repeated stress such as strain. A carbon nanotube composite material of the invention is a conductive material having carbon nanotubes dispersed in a matrix including observing a peak in each region of 110&#xb1;10 cm, 190&#xb1;10 cmand 200 cmor more in a Raman spectroscopic analysis at a wavelength of 633 nm, and a ratio R/Rof an electrical resistance R after a load of repeated stress of 100 times at 10% elongation with respect to an electrical resistance Rprior to applying a load is 5 or more. In addition, a conductive material of the invention comprises these characteristics of the carbon nanotube composite material.

Carbon nanotube composite material and conductive material

A CNT composite material includes a CNT group and carbon fibers dispersed in a matrix, the CNT composite material includes 0.01 wt % or more and 30 wt % or less of CNT aggregate. The CNT group includes a three dimensional network structure with a size of 10 &#x3bc;m or more and has a maximum distribution range of a differential pore volume of 0.01 &#x3bc;m or more and 10 &#x3bc;m or less in a range of 4 nm or more and 1000 &#x3bc;m or less of a pore diameter. The carbon fibers have a maximum distribution range of a differential pore volume of 1 &#x3bc;m or more and 100 &#x3bc;m or less in a range of 4 nm or more and 1000 &#x3bc;m or less of a pore diameter. A total specific surface area of the CNT aggregate and the carbon fibers is 10 m/g or more and 500 m/g or less.

Carbon nanotube composite material and thermal conductor

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

Device for manufacturing aligned carbon nanotube assembly

A method of producing a carbon nanotube film structure having a substrate and a carbon nanotube layer, comprises a placing step of placing a carbon nanotube film comprising a plurality of carbon nanotubes aligned in one direction within a film plane on the substrate; and a densifying step of applying a densifying treatment to the carbon nanotube film thereby forming the carbon nanotube layer having the weight density of the carbon nanotube to 0.1 g/cmor more. Thus, a problem of island-like shrinkage caused while a highly densified CNT layer is being manufactured is solved, and a high-quality CNT film structure wherein the aligned CNT layer having a high density and uniform thickness is deposited on the substrate.

Carbon nanotube film structure and method for manufacturing the same

A production method in accordance with the present invention includes the steps of: providing a catalyst support layer by applying, to a substrate, a catalyst support layer coating agent obtained by dissolving in an organic solvent (i) an organometallic compound containing aluminum and/or a metal salt containing aluminum and (ii) a stabilizer for inhibiting a condensation polymerization reaction of the organometallic compound and/or the metal salt; providing a catalyst formation layer by applying, to the catalyst support layer, a catalyst formation layer coating agent obtained by dissolving in an organic solvent (a) an organometallic compound containing iron and/or a metal salt containing iron and (b) a stabilizer for inhibiting a condensation polymerization reaction of the organometallic compound and/or the metal salt; and growing an aligned carbon nanotube aggregate on the substrate by chemical vapor deposition (CVD).

Growing community of inventors

Tsukuba, Japan

Kenji Hata