Abstract: Provided are a composite material and a reinforced fiber. The composite material includes a fiber and a plurality of carbon nanotubes disposed on a surface of the fiber. The carbon nanotubes adhere directly to the surface of the fiber.

Abstract: A carbon fiber-reinforced molded article includes an arranged composite material and a cured resin product. The composite material includes a carbon fiber bundle and carbon nanotubes. The carbon fiber bundle is in which a plurality of continuous carbon fibers are arranged. The carbon nanotubes adhere to respective surfaces of the carbon fibers. A modulus of elasticity obtained by conducting a three-point bending test with a cushioning material is smaller than a modulus of elasticity obtained by conducting the three-point bending test without the cushioning material.

Abstract: Provided are a composite material capable of further enhancing property derived from carbon nanotubes adhered to carbon fibers, a prepreg, a carbon-fiber-reinforced molded article, and a method for manufacturing a composite material. There is provided a composite material including: carbon fibers; and a structure which includes a plurality of carbon nanotubes and has a network structure in which the carbon nanotubes are in direct contact with each other, and in which the carbon nanotubes adhered to surfaces of the carbon fibers directly adhere to the surfaces of the carbon fibers. The carbon nanotubes have a bent shape having a bent portion.

Abstract: A high pressure container has enhanced pressure resistant strength, and a method for manufacturing such high pressure container. The high pressure container includes a sealable hollow liner and a reinforcement layer including a composite carbon fiber bundle covering an outer surface of the hollow liner, wherein the reinforcement layer is wound around the outer surface of the hollow liner and fixed with a cured product of thermosetting resin, and a stress relaxation portion including the cured product of thermosetting product and a plurality of carbon nanotubes between a carbon fiber contained in one composite carbon fiber bundle and a carbon fiber contained in the other composite carbon fiber bundle.

Abstract: A carbon fiber-reinforced molded article includes an arranged composite material and a cured resin product. The composite material includes a carbon fiber bundle and carbon nanotubes. The carbon fiber bundle is in which a plurality of continuous carbon fibers are arranged. The carbon nanotubes adhere to respective surfaces of the carbon fibers. A modulus of elasticity obtained by conducting a three-point bending test with a cushioning material is smaller than a modulus of elasticity obtained by conducting the three-point bending test without the cushioning material.

Abstract: There is provided a carbon fiber-reinforced molded article that avoids peeling of carbon fibers from a base material and has high strength, the carbon fiber-reinforced molded article comprising a base material and a composite material dispersed in the base material, wherein the composite material comprises carbon fibers and a structure formed on the surface of the carbon fibers and including a plurality of carbon nanotubes, the plurality of carbon nanotubes forms a network structure in which the carbon nanotubes are directly connected to one another, and the plurality of carbon nanotubes is directly attached to the surface of the carbon fibers by using a portion of the surface thereof as an attaching portion, and also is physically bound to the surface of the carbon fibers via a binding member provided on at least a portion other than the attaching portion.

Abstract: Provided are a composite material and a reinforced fiber. The composite material (1) includes a fiber (3) and a plurality of carbon nanotubes (5) disposed on a surface of the fiber (3). The carbon nanotubes (5) adhere directly to the surface of the fiber (3). The composite material and the reinforced fiber exhibit both of intrinsic functions of the fiber and functions, such as electrical conductivity, thermal conductivity, and mechanical strength, derived from CNTs.

Abstract: There are provided an easily producible catalyst particle-holding structure used for production of carbon nanotubes, and a method for producing the same. The method for producing the catalyst particle-holding structure of the present invention used for production of carbon nanotubes includes a step of forming a catalyst particle forming layer containing Si, Al, and Fe, and a step of performing a heat treatment on the catalyst particle forming layer in an atmosphere containing oxygen, to form catalyst particles containing Fe. The catalyst particles are held by the catalyst particle forming layer so that the catalyst particles are partially embedded in the catalyst particle forming layer. The size and the number of the catalyst particles containing Fe are controlled by adjusting the amount of oxygen contained in the atmosphere for the heat treatment. Thus, the catalyst particle-holding structure is formed easily.

Abstract: A high pressure container has enhanced pressure resistant strength, and a method for manufacturing such high pressure container. The high pressure container includes a sealable hollow liner and a reinforcement layer including a composite carbon fiber bundle covering an outer surface of the hollow liner, wherein the reinforcement layer is wound around the outer surface of the hollow liner and fixed with a cured product of thermosetting resin, and a stress relaxation portion including the cured product of thermosetting product and a plurality of carbon nanotubes between a carbon fiber contained in one composite carbon fiber bundle and a carbon fiber contained in the other composite carbon fiber bundle.

Abstract: There are provided a method for producing a composite material from which a high-strength prepreg having CNT-derived properties fully exerted is obtained, comprising a step of immersing a carbon fiber bundle including a plurality of continuous carbon fibers in a carbon-nanotubes-isolated dispersion containing a plurality of isolatedly-dispersed carbon nanotubes and applying ultrasonic vibrations at a frequency of more than 40 kHz and 180 kHz or less to form a structure comprising a plurality of carbon nanotubes on the surface of each of the plurality of carbon fibers, wherein the structures are directly attached to the surface of each of the plurality of carbon fibers and form together a network structure in which the carbon nanotubes are directly connected to one another, and such a composite material.

Abstract: There is provided a carbon fiber-reinforced molded article that avoids peeling of carbon fibers from a base material and has high strength, the carbon fiber-reinforced molded article comprising a base material and a composite material dispersed in the base material, wherein the composite material comprises carbon fibers and a structure formed on the surface of the carbon fibers and including a plurality of carbon nanotubes, the plurality of carbon nanotubes forms a network structure in which the carbon nanotubes are directly connected to one another, and the plurality of carbon nanotubes is directly attached to the surface of the carbon fibers by using a portion of the surface thereof as an attaching portion, and also is physically bound to the surface of the carbon fibers via a binding member provided on at least a portion other than the attaching portion.

Abstract: Provided are a composite material and a reinforced fiber. The composite material includes a fiber and a plurality of carbon nanotubes disposed on a surface of the fiber. The carbon nanotubes adhere directly to the surface of the fiber.

Abstract: There are provided an easily producible catalyst particle-holding structure used for production of carbon nanotubes, and a method for producing the same. The method for producing the catalyst particle-holding structure of the present invention used for production of carbon nanotubes includes a step of forming a catalyst particle forming layer containing Si, Al, and Fe, and a step of performing a heat treatment on the catalyst particle forming layer in an atmosphere containing oxygen, to form catalyst particles containing Fe. The catalyst particles are held by the catalyst particle forming layer so that the catalyst particles are partially embedded in the catalyst particle forming layer. The size and the number of the catalyst particles containing Fe are controlled by adjusting the amount of oxygen contained in the atmosphere for the heat treatment. Thus, the catalyst particle-holding structure is formed easily.