2000 Fiscal Year Final Research Report Summary
Producing the Nano-Scale Aggregates by Using Plasma
| Project/Area Number |
10450284
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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 | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | TOHOKU University |
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Principal Investigator |
MIURA Takatoshi TOHOKU University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60111259)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Hideyuki TOHOKU University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40241533)
TANNO Shoji TOHOKU University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (00217217)
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| Project Period (FY) |
1998 – 2000
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| Keywords | soot / carbon black / aggregation / aerosol / Brownian motion / pyrolysis / plasma |
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| Research Abstract |
Analysis of the nano-scale particle growth like carbon black, which is produced by incomplete combustion of heavy oils, is essential to controlling a nano-scale aggregate shape. However, the particle growth process in high temperature aerosol includes several phenomena, which are the fuel pyrolysis, nucleation, surface growth, particle aggregation, oxidation and so on. In this study, we carried out the experiment to form the soot by the pyrolysis of 1 mol% benzene (in 99 mol% nitrogen) in an alumina tube, which was kept at 1573K, with variations of residence time (from 0.05 to 0.5 sec). The classification was carried out in order to obtain an overall characterization of the soot formation process. We also investigated the peripheral fractal dimension (D_<peri>) of the soot aggregates. The reaction kinetics model includes four kinds of reactions (pyrolysis of benzene, nucleation, particle growth and coagulation). In addition, a cluster-cluster aggregation model called Aggregate Mean free Path (AMP) model was developed to simulate the aggregation in the furnace. The present model simulated the aggregation between soot particles and aggregates by using the mean free paths of particles and aggregates. We also investigated that the fuel and the temperature in a tube influence on the soot formation process. In addition to, we suggested the new method of controlling a nano-scale aggregate shape. In the future, we will carry out to produce the new nano-scale aggregate in higher temperature condition (2000K-).
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