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Nanocarbon-producing device

a technology of producing devices and nano-carbons, applied in the direction of material nanotechnology, chemistry apparatus and processes, textiles and paper, etc., can solve the problems of shortening the life affecting the stability of the apparatus, and the failure of the laser beam window, so as to achieve stable production, prolong the life of the apparatus, and increase the yield

Inactive Publication Date: 2007-02-01
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] The present invention is performed in view of the foregoing circumstances, an object of the invention is to provide a technology in which the nanocarbon is stably obtained at high yield. Another object of the invention is to provide a technology in which the lifetime of the nanocarbon producing apparatus is lengthened.
[0033] As described above, according to the invention, the nanocarbon can be produced at high yield by providing the shielding member between the window unit and the graphite target. Further, according to the invention, the lifetime of the nanocarbon producing apparatus can be lengthened.

Problems solved by technology

A lifetime of the laser beam window is relatively shorter, and sometimes the laser beam window failed.
As a result, it is found that the apparatus is expensive to maintain and the lifetime of the apparatus becomes shorter.
Further, it is speculated that the heating of the laser beam window or the lens causes the failure and the like.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0048] The present embodiment relates to a nanocarbon producing apparatus in which a periphery of an optical path of the light with which the surface of the graphite target is irradiated is shrouded with a cover. FIG. 1 is a sectional view showing an example of a configuration of a nanocarbon producing apparatus according to the embodiment. In this specification, FIG. 1 and other drawings used for the description of other pieces of producing apparatus are a schematic view, and the dimensions of each component do not always correspond to an actual dimension ratio.

[0049] A nanocarbon producing apparatus 125 of FIG. 1 includes a producing chamber 107, a nanocarbon recovery chamber 119, and a transportation pipe 141 which connects the producing chamber 107 and the nanocarbon recovery chamber 119. The producing apparatus of FIG. 1 also includes a laser beam source 111 which emits a laser beam 103, a ZnSe planoconvex lens 131, a ZnSe window 133, a cover 167, and a rotating device 115. Th...

second embodiment

[0086] The present embodiment relates to a nanocarbon producing apparatus having a configuration in which the surface of the graphite rod 101 is not directly irradiated with the light outgoing from the light source 111, but the surface of the graphite rod 101 is irradiated after the light is reflected to change the optical path.

[0087]FIG. 4 is a sectional view showing a state of a nanocarbon producing apparatus 173 according to the embodiment when laterally viewed. In the embodiment, the same component as the nanocarbon producing apparatus 125 described in the first embodiment is designated by the same reference numeral, and the description will be neglected as appropriate.

[0088] In the configuration of the nanocarbon producing apparatus 125 (FIG. 1), after the laser beam 103 outgoing from the laser beam source 111 is focused by the ZnSe planoconvex lens 131 such that the spot diameter becomes a predetermined size in the surface of the graphite rod 101, the laser beam 103 irradiat...

third embodiment

[0094] The present embodiment relates to another configuration of a nanocarbon producing apparatus. In the embodiment, the same component as the nanocarbon producing apparatus 125 (FIG. 1) described in the first embodiment or the nanocarbon producing apparatus 173 (FIG. 4) described in the second embodiment is designated by the same reference numeral, and the explanation will not be described as appropriate.

[0095]FIG. 5 is a sectional view showing a state of a nanocarbon producing apparatus 175 according to the embodiment when laterally viewed. The basic apparatus configuration of the nanocarbon producing apparatus 175 is similar to the nanocarbon producing apparatus 173 (FIG. 4). However, the nanocarbon producing apparatus 175 differs from the nanocarbon producing apparatus 173 in that the cover 167 for protecting the passage of the laser beam 103 is provided.

[0096] As described in the first embodiment, the direct adhesion of the soot-like substance, generated from the plume 109,...

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Abstract

In a nanocarbon-producing device (173), a plane mirror (169) and a parabolic mirror (171) are arranged in a production chamber (107). Light, emitted from a laser light source (111), transmitted through a ZnSe window (133) is reflected at the plane mirror (169) and the parabolic mirror (171), collected at the parabolic mirror (171), and then irradiated onto the surface of a graphite rod (101).

Description

TECHNICAL FIELD [0001] The present invention relates to a nanocarbon producing apparatus. BACKGROUND ART [0002] Recently technological application of nanocarbon is actively studied. The nanocarbon means a carbon substance having a nanoscale fine structure, typified by a carbon nanotube, a carbon nanohorn, and the like. Among others, the carbon nanohorn has a tubular structure in which one end of the carbon nanotube formed by a cylindrically rounded graphite sheet is formed in a circular conic shape. Usually the carbon nanohorns aggregate in a form, in which the circular conic unit is projected from a surface like a horn while the tube is located in the center by Van der Waals force acting between circular conic units. The carbon nanohorn assembly is expected to be applied to various technical fields due to specific characteristics thereof. [0003] It is reported that the carbon nanohorn assembly is produced by a laser vaporization method of irradiating the carbon substance (hereinaft...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01F9/12C01B31/02
CPCB82Y30/00C01B31/0293C01B31/0226B82Y40/00C01B32/16C01B32/18
Inventor AZAMI, TAKESHIYOSHITAKE, TSUTOMUKUBO, YOSHIMIKASUYA, DAISUKEIIJIMA, SUMIOYUDASAKA, MASAKO
Owner NEC CORP
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