| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Research Abstract |
1) Passive Mie scattering experiment
Under normal gravity condition, an obstacle plate is set in a reactor, and dispersed light is recorded by a CCD camera. It is found that about 0.5 micrometer size of carbon clusters generate around the arc plasma, and they flow upwards by natural heat convection (v~0.5 m/s). This flow is in good consistent with the result of fluid simulation. The generation place of carbon clusters is around the plasma, where the gas temperature decreases from 8000 K to less than 1200 K.
2) Active Mie scattering experiment
Laser light is irradiated from bottom side to upper side through center of the arc plasma. 90 degree-scattered laser-light is detected and processed by the pulse-modulation technique and the Lock'in amplification technique. As a result, larger signal is obtained according to the discharge current and the He-gas pressure. Vertical distribution of the scattered intensity changes a little above the arc plasma.
3) Production process of single-walled carbon nanotubes
A 8-ch cluster-collector is set aside of the arc plasma, and coming carbon particles are collected at the each position. From this measurement, spatial distribution of nanotubes is measured. As a result, nanotubes are almost produced around the periphery of the arc plasma, where the gas temperature sharply decreases.
4) Gas flow and production of multi-walled carbon nanotubes by a thermal CVD method
In a vertically set glass tube, a small steel-ball is set, on which Ni-catalyst-powder is coated. By flowing Ar gas and ethanol gas, and by 800 C of thermal heating, we could make carbon nanotubes. Depending on the flow direction of hydrocarbon gas,
nanotube-density is changed.
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