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Research of dielectric fluid dispersing barium titanate

Research Project

Project/Area Number 03650514
Research Category

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

Allocation TypeSingle-year Grants
Research Field 資源開発工学
Research InstitutionMINING COLLEGE, AKITA UNIVERSITY

Principal Investigator

FUJITA Toyohisa  Akita Univ., Mining College, Dept.of Geosciences,Mining Eng. and Material Processing Assoc. Prof., 鉱山学部, 助教授 (70124617)

Co-Investigator(Kenkyū-buntansha) MAMIYA Mitsuo  Akita Univ., Mining College, Dept.of Geosciences,Mining Eng. and Material Proces, 鉱山学部, 名誉教授 (00006628)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsBarium titanate / Dielectric fluid / Electrorheological fluid / Levitation force / viscosity
Research Abstract

Amorphous barium titanate has been prepared by hydrolysis of titanium isopropoxide in aqueous alkaline solutions in the presence of barium ions at -320K. The dielectric constant of the barium titanate is strongly dependent on the moisture content. As the average particle size was in the range 5-10nm, the particles dispersed stably in kerosene when coated with surfactant polyoxyethylene alkyl ether acetates. A glass sphere immersed in the resulting dielectric fluid with low moisture content experienced a levitation force under the influence of an electric field gradient.
The viscosity change of hydrocarbon based fluid dispersing surfactant coated about 10nm barium titanate particles was investigated under DC electric field. When the dispersed particle contained moisture, the fluid became a Bingham body under adequate DC electric field intensity at room temperature and the static yield stress was influenced extremely by the moisture percentage, volume fraction of solid particles and electric field intensity.When the dispersed particle contained no water, the fluid became easily a Bingham body at temperature between 373K and 393K under adequate DC electric field intensity. The increases of volume fraction and electric field intensity are considered to produce higher static yield stress for the practical application.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] T.FUJITA and I.J.Lin: "Dielectric fluid preparation by dispersing ultrafine barium titanate" Powder Technology. 68. 235-242 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.FUJITA,I.J.Lin and M.MAMIYA: "Viscosity change of dielectric fluid dispersing barium titanate by applying electric field" Sup.of the Int.J. Applied Electromagnetics in Materials. 2. 123-126 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Fujita,: "Dielectric fluid preparation by dispersing ultrafine barium titanate particles in kerosene" Poeder Technology. 68. 235-242 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Fujita,: "Viscosity change of dielectric fluid dispersing barium titanate by applying electric field" Sup. of the Int. J. Applied Electromagnetics in Materials. 2. 123-126 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Fujita,I.J.Lin and M.Mamiya: "Viscosity change of dielectric fluid dispersing barium titanate by applying electric field" Sup.of the Int.J.Applied Electromagnetics in Materials. 2. 123-126 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Fujita: "Dielectric fluid preparation dispersing ultrafine barium titanate particles in kerosene" Powder Technology. 68. 235-242 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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