| Project/Area Number |
08650027
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Gifu National College of Technology |
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Principal Investigator |
OHNO Takehisa Gifu National College of Technology, Fundamental Science, Professor, 専門基礎, 教授 (20099807)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Gas-evaporation technique / Composite Nanoparticles / Coper-Zinc System / Crystal growth / Electron microscopy / 電子顕微鏡法 / 銅・亜鉛合金系 / 銅・フラーレン系 |
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| Research Abstract |
The aim of this study is to investigate a crystal growth mechanism of composite nanoparticles prepared by a gas-evaporation technique, that is, a method preparing ultrafine particles by evaporation of meterial in an atmosphere of inert gas at a low pressure. The sample preparation was carried out according to the following procedure. First, smoke particles A of nanometer size prepared by a gas-evaporation technique are introduced into a quartz tube which is differentially evacuated and heated by a tubular furnace. Then, the subsequent condensation of vapor of another material B onto the surface of the smoke particles A occurs in the tube. Thus, A-B composite nanoparticles grow through the above process. The particles are collected direstly onto TEM microgrids and observed using a transmission electron microscope. In the term of project, the crystal structure and morphology of Cu-Zu and Cu-C_<60> systems were studied in relation to the preparation conditions. For the latter system, the growth of C_<60> nanoparticles was studied in advance. The results are as the following.
1.Cu-Zn composite system : Composite nanoparticles grew under the limited preparation conditions (mainly, evaporation temperature of copper T_<Cu'> argon pressure P_<Ar> and heating temperature of zinc T_F). For low T_<F'> Cu phase particles grew because of low vapor density of zinc. For high T_<F'> alloy phase particles grew due to alloying among Cu nanoparticles and zinc vapor. For adequate T_<F'> composite nanoparticles with the morpology of Cu-Zn alloy phase surrounded by zinc layr.
2.Cu-C_<60> systems : The aim of this system is mainly to study the effect of nonmetallic material C_<60>. As a result, C_<60> existed not as single molecules but as clusters in the tube. And C_<60> transformed to graphite with the progress of heating.
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