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Preparation, microstructure and electrorheological property of nano-sized TiO2 particle materials doped with metal oxides

机译：掺杂金属氧化物的纳米TiO2 颗粒材料的制备，微结构和电流变特性

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摘要

New nano-sized TiO2 electrorheological (ER) materials doped with different metal (M = Na, Zr, Ce, Al, Ca, Zn) oxides have been prepared. Relationships between the composition, microstructure, conductivity, dielectric property and ER effect of these materials have been studied. The results show that doping Na2O, ZrO2, Al2O3 or CeO2 can enhance the ER performance of the TiO2 material, whereas, doping CaO or ZnO would decrease the ER activity of the material. The shear stress (τE) of the suspension (25 wt%) of Na-doped TiO2 in dimethyl silicone oil reaches 1.6 kPa at the electric field strength E = 4.2 kV/mm and shear rate γ = 300 s?1, and its τr value of 54.6 (τr = τE/τ0, where τ0 is the shear stress at no electric field) is seven times higher than that of pure TiO2 suspension. This high τr value is very advantageous to the use. The dielectric loss tangent (tanδ) plays a dominant role in influencing the ER performance of a particle material, and the effect of the surface area (pore volume, especially) and grain size should be taken into account.
机译：制备了掺杂有不同金属（M = Na，Zr，Ce，Al，Ca，Zn）金属氧化物的新型TiO2电流变材料。研究了这些材料的组成，微观结构，电导率，介电性能和ER效应之间的关系。结果表明，掺杂Na2 O，ZrO2 ，Al2 O3 或CeO2 可以增强TiO2 材料的ER性能，而，掺杂CaO或ZnO会降低材料的ER活性。 Na掺杂的TiO2 在二甲基硅油中的悬浮液（25 wt％）的剪切应力（τE）在电场强度E = 4.2 kV / mm和剪切速率γ=时达到1.6 kPa。 300 s？1 ，其τr值为54.6（τr =τE /τ0，其中τ0是无应力时的剪应力电场）是纯TiO2悬浮液的7倍。较高的τr值对于使用非常有利。介电损耗角正切（tanδ）在影响颗粒材料的ER性能中起主要作用，应考虑表面积（尤其是孔体积）和晶粒尺寸的影响。

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  • 来源
    《Journal of Materials Science》 |2007年第8期|2586-2590|共5页
  • 作者

    Yan-Li Shang; Yun-Ling Jia; Fu-Hui Liao; Jun-Ran Li; Ming-Xiu Li; Juan Wang; Shao-Hua Zhang;

  • 作者单位

    State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China;

    State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China;

    State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China;

    State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China;

    Department of Chemistry Hebei Normal University Shijiazhuang 050091 China;

    School of Vehicle and Transmission Engineering Beijing Institute of Technology Beijing 100081 China;

    School of Vehicle and Transmission Engineering Beijing Institute of Technology Beijing 100081 China;

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