Hodogaya Chemical Co., Ltd.

Bussan Nanotech Research Institute, Inc.

Jiayi Shan

Takayuki Tsukada

Tsuyoshi Okubo

Fuminori Munekane

Koichi Handa

Subiantoro

Kazuhiro Osato

Disclosed is a fine carbon fibrous structure which comprises carbon fibers and granular parts, wherein at least two granular parts connect by at least one of the carbon fibers; wherein the fine carbon fibrous structure have a D/Dratio of 1.3 to 10, wherein the Dis the median diameter of outer diameters of the carbon fibers and the Dis the area-based circle-equivalent median diameter of the particles; wherein the granular parts have a Dof 0.05 to 0.4 &#x3bc;m; wherein the carbon fibers have a median length of not more than 20 &#x3bc;m; wherein the granular parts are produced in a growth process of the carbon fibers; and wherein at least a graphene layer which exists on and constitutes the surface of each granular part is continued on a graphene layer which exists on and constitutes the surface of the carbon fiber which connects between the granular parts.

Fine carbon fibrous structure

A method for forming a carbon fibrous structure having a plurality of granular parts, to which a plurality of carbon fibers are bound, includes heating a mixture of a carbon source and a catalyst at a temperature between 800 &#xb0; C. and 1300 &#xb0; C. to produce aggregates of a first intermediate, heating the aggregates of the first intermediate to remove hydrocarbons, at a temperature between 800 &#xb0; C. and 1200 &#xb0; C. to produce aggregates of a first product, heating the aggregates of the first product at a temperature between 2400 &#xb0; C. and 3000 &#xb0; C. to produce aggregates of a final product; and pulverizing the aggregates of the final product such that area-based circle-equivalent mean diameter of each aggregate of the carbon fibrous structure of the product is 50-100 &#x3bc;m, bulk density of the carbon fibrous structure is 0.0001-0.02 g/cm, and powder resistance under pressed density of 0.8g/cmis not more than 0.02 &#x3a9;&#xb7;cm.

Carbon fibrous structure

An composite material is disclosed, which includes carbon fibrous structures which are capable of being included in a relatively large amount in the composite material, and which are capable of improving the physical properties, such as electric, mechanical, or thermal properties. The carbon fibrous structure comprises (a) carbon fibrous structures each of which comprises a three dimensional network of carbon fibers, each of the carbon fibers having an outside diameter of 15-100 nm, wherein the carbon fibrous structure further comprises a granular part, at which the carbon fibers are bound in a state that the carbon fibers are extended outwardly therefrom, and wherein the granular part is produced in a growth process of the carbon fibers, and (b) an material other than the carbon fibrous structures, wherein the amount of carbon fibrous structures added is more than 30% and not more than 100% by weight of the total weight of the composite.

Composite material

Disclosed is a carbon fibrous structure which comprises a granular part and 2-20 pieces of carbon fibers each of which has an outside diameter of 15-100 nm and which are extend outwardly from the granular part, wherein the granular part is produced in a growth process of the carbon fibers, wherein the size of granular part is 1.3 or more of times larger than the outside diameter of the carbon fibers, and wherein the mean length of the carbon fibers is not more than 20 &#x3bc;m. The carbon fibrous structure improves the physical properties of the matrix, such as electric, mechanical, or thermal properties, while maintaining the other properties of the matrix, even when added at a small amount.

A composite material includes a matrix and carbon fibrous structures. The carbon fibrous structure has a three dimensional network of carbon fibers, each having an outside diameter of 15&#x2013;100 nm, and has a granular part with which carbon fibers are bound in a state such that the carbon fibers extend outwardly from the granular part, and the granular part being produced in a growth process of the carbon fibers. The additive amount of the carbon fibers is in the range of 0.1 to 30% by weight of total weight of the composite material.

Growing community of inventors

Tokyo, Japan

Jiayi Shan