Korea Advanced Institute of Science and Technology

Agency for Defense Development

Seong-Ho Yang

Hyun-Seok Kim

Jeung-Ku Kang

Kyu-Sung Han

Jung-woo Lee

Se-Yun Kim

Jai-Young Lee

Weon-Ho Sin

Seong Min Lee

Weon-Ho Shin

Hyoung-seop Kim

Jun-Hyeon Bae

Ho-Yong Um

Lee-Ju Park

Hak-Jun Kim

See-Am Lee

In a localized torsional severe plastic deformation method for conical tube metal, a desired region of a conical tube metal can be subjected to severe plastic deformation using molds in which roughness is formed at predetermined regions. The method includes roughening a predetermined region of each of the molds; sticking the conical tube metal only to the roughened regions of the molds; moving the lower mold toward the upper mold to apply a load to the conical tube metal; and rotating the molds to apply severe plastic deformation to the conical tube metal only at the regions stuck to the roughened regions of the molds.

Localized torsional severe plastic deformation method for conical tube metals

The present invention relates to a method for manufacturing a transition metal-carbon nanotube hybrid material using nitrogen as a medium. The present invention is characterized in that nitrogen-added carbon nanotube is grown in the presence of metal catalyst particles by reacting an hydrocarbon gas with a nitrogen gas by a chemical vapor deposition (CVD) and a transition metal-carbon nanotube hybrid material where a transition metal is uniformly attached to the entire carbon nanotube structure in which nitrogen with a great chemical reactivity is added as heterogeneous elements is chemically manufactured. Therefore, the present invention does not use an acid treatment required to attach transition-metal atoms to the carbon-nanotube, a surface treating process using a surfactant and the like and an inhibitor for preventing the coagulation of the transition metal so that a simplification of the process is obtained and the method is an environment-friendly method. The transition metal-carbon nanotube hybrid material manufactured by the above can be applied variously as a hydrogen storage material, a catalyst material, an electric field emission device and an electrode material.

Nitrogen-mediated manufacturing method of transition metal-carbon nanotube hybrid materials

The present application provides a CNnanotube with pores having nano-sized diameter ranging from 5 to 10 &#x212b;, where x ranges from 0.001 to 0.2, and a method for controlling the size and quantity of pores in said nanotube by reacting hydrocarbon gas, nitrogen gas, and oxygen gas or hydrogen gas together in the presence of metal catalyst and by controlling the concentration of nitrogen gas.

Carbonnitride nanotubes with nano-sized pores on their stems, their preparation method and control method of size and quantity of pore thereof

Disclosed are carbon nitride (CN) nanotubes with nano-sized pores on their stems, their preparation method and control method of size and quantity of pores thereof. The present invention further has an object of providing the CNnanotube with pores having the size of not more than 1 nm over structure of the nanotube and a method for preparing the same. Another object of the present invention is to provide the control method of the size and quantity of pores with size of not more than 1 nm in the preparation of the CNnanotube with the pores over structure of the nanotube. The present invention can produce the CNnanotube with nano-sized pores by reacting hydrocarbon gas and nitrogen gas through plasma CVD in the presence of metal catalyst particles, wherein x ranges from 0.001 to 0.2.

Growing community of inventors

Daejeon, South Korea

Seong-Ho Yang