1996 Fiscal Year Final Research Report Summary
Development of a Synthesis Method for Tailored-Particles using the Coulomb Crystal Formation Process in Reactive Plasmas
| Project/Area Number |
07558065
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
プラズマ理工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TACHIBANA Kunihide Graduate School of Engineering, Professor, 工学研究科, 教授 (40027925)
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| Co-Investigator(Kenkyū-buntansha) |
TATSUTA Toshiaki SAMCO International Inc., R & D Center, Director, R&Dセンター, センター長
HAYASHI Yasuaki Kyoto Institute of Technology, Faculty of Engineering and Design, Associate Prof, 工芸学部, 助教授 (30243116)
YASAKA Yasuyoshi Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (30109037)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Dusty Plasma / Coulomb Crystal / Liquid-to-Solid Phase Transition / Mie-Scattering Ellipsometry / Layred-Structure Particles |
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| Research Abstract |
A series of study for establishing a method to synthesize tailored particles and collect them efficiently has been carried out by utilizing the phenomenon of Coulomb solidification of negatively charged particles in a plasma. Firstly, for the study of the production and growth processes of particles, the source hydrocarbon gases, the operating pressure, and the RF input power have been systematically changed. The charged density on a particle and the force between the particles have been estimated from the measured plasma parameters by microwave interferometer etc. The number density and the growth rate of trapped particles have also been monitored by the Mie-scattering ellipsometry (MSE) technique which has been developed by ourselves. From the video monitoring, the alignment of randomly distributed particles into a body centered cubic structure, and then into a closely packed hexagonal lattice structure has been observed. Based on these data the solidification condition has been argued using the estimated Coulomb coupling parameter.
The particles grown under such a condition have been proved to be almost perfectly spherical and the size dispersion is very small by the MSE analysis, which is consistent with the SEM observation. The synthesis of tailored particles with layred structure is being studied e.g.by switching the source gas from methane to silane as well as the method of the theoretical formulation of the MSR data for particles with the layred structure.
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