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Development of Preparation Process of Fine Particles Using Reverse Micelles

Research Project

Project/Area Number 04453124
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 反応工学
Research InstitutionOsaka University

Principal Investigator

KOMASAWA Isao  Osaka Univ., Fac.of Eng.Sci., Professor, 基礎工学部, 教授 (40029476)

Co-Investigator(Kenkyū-buntansha) HIRAI Takayuki  Osaka Univ., Fac.of Eng.Sci., Research Associate, 基礎工学部, 助手 (80208800)
KUBOI Ryoichi  Osaka Univ., Fac.of Eng.Sci., Associate Professor, 基礎工学部, 助教授 (40029567)
轡 泉  大阪大学, 基礎工学部, 助手 (60163870)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1992: ¥3,400,000 (Direct Cost: ¥3,400,000)
KeywordsReverse Micelles / Semiconductor Ultrafine Particles / Crystallization / Titanium Dioxide / Cadmium Sulfide / Zinc Sulfide / Photocatalyst / Hydrogen Generation / 超微粒子 / 単分散微粒子 / 半導体
Research Abstract

The mechanism of formation of TiO_2 ultrafine particles in aerosol OT(AOT)/isooctane reverse micellar system by hydrolysis of titanium tetrabutoxide (TTB) was investigated. The mesurement of change in UV-vis. absorption spectra showed that the increase of TTB concentration and water content ( = [H_2O]/[AOT]), and the decrease of surfactant concentration were found to facilitate particle formation. The particle formation was controlled by TTB concentration and the number of micelles, since a certain number of hydrolyzed molecules are required to form a stable nucleus in a micell. A reaction scheme of particle formation based on the number of micelles was proposed, which successfully explained the absorption spectra and particle diameter experimentally obtained.
CdS and ZnS ultrafine particles were prepared by mixing two reverse micellar solutions containing Cd(NO_3)_2 (or Zn(NO_3)_2)and Na_2S, respectively. The particles less than 5nm in diameter were successfully prepared when the water content was less than 10. In the early stage (0-20ms), the particle formation and coagulation was controlled by the collision and redispersion process of the micelles. In the later stage (20ms-), the coagulation was dominated by distribution of the particles amongst the reverse micelles.
The preparation of CdS-ZnS composite particle was also investigated. Zn_XCd_<1-X>S composite ultrafine particles were prepared by simultaneous precipitation in the reverse micellar system. ZnS-coated CdS ultrafine particles were prepared by sequential precipitation of ZnS on the CdS particles in the reverse micelles. These particles showed high photocatalytic activity for hydrogen generation by water cleavage in the reversed micellar system.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 平井隆之: "逆相ミセルを利用したアルコキシド法による金属酸化物超微粒子の調製" 化学工学論文集. 18(3). 296-302 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Hirai: "Mechanism of Formation of Titanium Dioxide Ultrafine Particles in Reverse Micelles by Hydrolysis of Titanium Tetrabutoxide" Ind.Eng.Chem.Res.32(12). 3014-3019 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 平井隆之: "逆相ミセルを用いる二酸化チタン超微粒子の調製とその機構" 化学工学シンポジウムシリーズNo.39,「液膜およびマイクロエマルション技術の新たな展開」,化学工学会. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Hirai, E.Imamura, T.Matsumoto, R.Kuboi and I.Komasawa: "Preparation of Metal Oxide Ultrafine Particles by Hydrolysis of Metal Alkoxide in Reverse Micelles (in Japanese)" Kagaku Kogaku Ronbunshu. 18(3). 296-302 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Hirai, H.Sato and I.Komasawa: "Mechanism of formation of Titanium Dioxide Ultrafine Particles in Reverse Micelles by Hydrolysis of Titanium Tetrabutoxide" Ind.Eng.Chem.Res.32(12). 3014-3019 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Hirai, H.Sato and I.Komasawa: "Preparation and Mechanism of Formation of Titanium Dioxide Ultrafine Particle in Reverse Micelles (in Japanese)" Kagaku Kogaku Symposium. Series No.39. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 平井隆之: "逆相ミセルを利用したアルコキシド法による金属酸化物超微粒子の調製" 化学工学論文集. 18(3). 296-302 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Hirai: "Mechanism of Formation of Titanium Dioxide Ultrafine Particles in Reverse Micelles by Hydrolysis of Titanium Tetrabutoxide" Ind.Eng.Chem.Res.32(12). 3014-3019 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 平井隆之: "逆相ミセルを用いる二酸化チタン超微粒子の調製とその機構" 化学工学シンポジウムシリーズNo.39,「液膜およびマイクロエマルション技術の新たな展開」,化学工学会. 印刷中.

    • Related Report
      1993 Annual Research Report
  • [Publications] 平井 隆之: "逆相ミセルを利用したアルコキシド法による金属酸化物超微粒子の調製" 化学工学論文集. 18(3). 296-302 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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