| Project/Area Number |
09555231
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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 | 展開研究 |
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| Research Field |
化学工学一般
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| Research Institution | Hiroshima University |
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Principal Investigator |
OKUYAMA Kikuo HIROSHIMA UNIVERSITY, FACULTY OF ENGINEERING, PROFESSOR, 工学部, 教授 (00101197)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMADA Manabu HIROSHIMA UNIVERSITY, FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (70178953)
大島 賢太郎 花王(株), 生産技術開発研究所, 研究員
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1997: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | Functional Fine Particle / Chemical Vapor Deposition / Scale-up / Numerical Simulation / Titania / Distrete-Sectional Model / Gold Nanopartical / Sintering phenomenon / 気相化学折出法(CVD) / CVD / Discrete-Sectioanlモデル / 液体原料 / 微粒子材料 / エアロゾルプロセス / 凝集粒子 / 焼結 / 酸化チタン粒子 / 一次粒子径 / 核生成 |
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| Research Abstract |
In the experimental portion of this study,
1. A reactor equipped with wall temperature controllers for preparation of fine particles was manufactured, and the temperature distribution at the wall and inside of the reactor were measured. Analysis of the gas velocity and temperature distributions in the reactor by numerical simulation showed that these distributions governing particle formation in the reactor could be evaluated theoretically.
2. A device for generating titanium alkoxide vapor or titanium tetrachloride vapor was also manufactured, to perform experiments of manufacturing titania fine particles by feeding either of the vapors into the reactor with carrier gas using the device. The state of agglomeration, and the size distributions of agglomerates and primary particles were determined by aerosol measurement techniques and electron microscopy. The complicated changes of the characteristics of manufactured particles with reaction temperature, flow rate of the carrier gas and two
… More
different vapors were clarified experimentally.
In the theoretical portion, a dynamic equation to model the particle manufacturing processes was derived in which formation of supersaturated atmosphere of reaction products, coagulational particle growth from monomers via clusters to particles, morphology change of agglomerated particles by sintering and growth of primary particles and transport of particles in a nonisothermal flow field, were taken into account. Here, a new model called the 2-dimensional discrete-sectional model was constructed to predict the early stage of particle formation processes more accurately by describing the simultaneous change in size and morphology of agglomerated particles using the surface area and volume of the particles. The chemical reaction rates of the vapors used were evaluated from the experimental results to incorporate the reaction rates in the model. Numerical simulation for the particle manufacturing processes based on the model gave good prediction for size and morphology of particles manufactured under various conditions. Consequently, it was made clear that the simulation technique proposed in the present study could give useful guidelines to design and scale-up of particle manufacturing reactors. Less
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