We report the microscopic, magnetic and rheological properties of magnetorheological elastomers (MRE) with carbonyl iron magnetic particles (CIP) dispersed into silicone in the concentration range 5–30% volume content. The samples have been fabricated under the action of a magnetic field (anisotropic A-MRE) or without it (isotropic I-MRE). For the A-MRE samples and at low particle concentration, the anisotropy is evident in the microstructure and the magnetic properties. However and at high particle concentration, the microstructural and magnetic anisotropy is much less noticeable and makes difficult to distinguish between isotropic and anisotropic state. The rheological characterization shows changes in the storage modulus G ′ when CIP content is from 5 to 30% volume and I-MRE (72% change) and A-MRE (70% change) character of the samples. However, this influence is remarkable in the loss modulus G ″ with big changes when considering CIP content from 5 to 30% volume and I-MRE (114% change) and A-MRE (142% change). We have also determined that the anisotropic samples with high particle content present the maximum magnetorheological effect of about 31% at low frequency (1–2 Hz).

中文翻译：

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有机硅/羰基铁颗粒磁流变弹性体的各向异性行为分析

我们报告了磁流变弹性体 (MRE) 的微观、磁性和流变特性，其中羰基铁磁性颗粒 (CIP) 以 5-30% 的体积含量分散到硅树脂中。样品是在磁场（各向异性 A-MRE）或没有磁场（各向同性 I-MRE）作用下制造的。对于 A-MRE 样品和低粒子浓度，各向异性在微观结构和磁性能中很明显。然而，在高粒子浓度下，微观结构和磁各向异性不太明显，并且难以区分各向同性和各向异性状态。流变学表征表明，当 CIP 含量为 5% 至 30% 体积时，储能模量 G ' 的变化以及样品的 I-MRE（72% 变化）和 A-MRE（70% 变化）特征。然而，当考虑到 CIP 含量从 5% 到 30% 体积和 I-MRE（114% 变化）和 A-MRE（142% 变化）时，这种影响在损耗模量 G '' 变化很大。我们还确定，具有高颗粒含量的各向异性样品在低频 (1-2 Hz) 下呈现出约 31% 的最大磁流变效应。