Magnetoconductance Characteristics of Magnetic-Sensitive Elastomer Doped with Soft Magnetic Particles with Different Particle Sizes
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摘要: 以磁化硅橡胶为基体,在有磁场和无磁场条件下制备了多种组分微米级(粒径5~8μm)和亚微米级(粒径200 nm)软磁颗粒掺杂的磁敏弹性体(MSE)试样,通过电导试验装置和磁致电导测试系统研究了不同MSE试样的磁致电导特性,探究磁致电导机理。结果表明:在有磁场条件下制备微米级颗粒填充的MSE的磁致电导特性随着颗粒含量的增加而显著增强;随着亚微米级颗粒掺杂量的增加,在有磁场条件下制备微米级和亚微米级颗粒掺杂的MSE中微米与亚微米颗粒间产生吸附效应,零场电导与磁致电导增加值均大幅度衰减,磁致电导特性较弱;在无磁场条件下制备不同粒径颗粒掺杂的MSE中无法形成有效导电通道,磁致电导特性明显低于在有磁场条件下制备相同含量颗粒掺杂MSE。Abstract: Taking vulcanized silicone rubber as matrix, the magnetic-sensitive elastomer(MSE) samples with various compositions of micron(particle size of 5-8 μm) and submicron(particle size of 200 nm) soft magnetic particles were prepared under conditions with magnetic field and without magnetic field, and the magneto-conductance characteristics of MSE samples were studied by conductance device and magnetic field-dependent conductance test system. The mechanism of magnetoconductance was explored. The results show that the magnetoconductance of MSE filled with micron particles under preparation condition with magnetic field increased significantly with increasing particle doping content. With increasing doping content of submicron particles, under the condition of magnetic field preparation, the adsorption effect occurred between micron and submicron particles in MSE doped with micron and submicron particles, the increase values of zero-field conductance and magnetoconductance decreased greatly, and the magnetoconductance property became weak. The different size particle-doped MSE under preparation condition without magnetic field could not form an effective conductive channel, and the magnetoconductance characteristics were significantly lower than those of the same content particle-doped MSE under preparation condition with magnetic field.
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