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).
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The authors received financial support from the Basque Government under the ACTIMAT (KK-2018/00099, Elkartek program) and FLUMAN (PI_2017_1_0043 and PI_2017_1_0055, PIBA program) projects, and University Basque Research Groups Funding (IT1245-19).
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María San Sebastián on leave from BCMaterials
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Berasategi, J., Salazar, D., Gomez, A. et al. Anisotropic behaviour analysis of silicone/carbonyl iron particles magnetorheological elastomers. Rheol Acta 59, 469–476 (2020). https://doi.org/10.1007/s00397-020-01218-4
- Magnetorheological elastomers
- Magnetic characterization