半導体粒子分散系のエレクトロレオロジー

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  • 大坪 泰文
    千葉大学工学部画像工学科
  • 関根 正裕
    (株)コロイドリサーチ 新日鉄化学(株)プラスチック技術センター

書誌事項

タイトル別名
  • Electrorheological Properties of Suspensions of Semiconducting Particles
  • ハンドウタイ リュウシ ブンサンケイ ノ エレクトロレオロジー

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Semiconducting tin dioxide particles were covered with insulating layer and its effect on electrorheological (ER) properties of the suspensions was examined under oscillatory and steady shear. When the particles were coated with titanium dioxide by hydrolyzing titanium tetraisopropoxide and heat-treated at 600°C, the suspension in a silicone oil showed a high yield stress at an electric field of 2.0 kV·mm-1. However, since the titanium dioxide layer was semiconducting, the current density was about 0.2 mA·cm-2 and would not be applicable to practical device. Using aluminium ion, the titanium dioxide can be doped from a semiconducting to an insulating state. The particles covered with surface layer consisting of titanium dioxide and aluminium oxide provided excellent ER fluids in water-free systems. The coating of semiconducting particles by hydrolysis of alkoxides is very useful for surface modification of particles to improve the ER performance of suspensions.

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