Tunable dynamic moduli of magnetic elastomers: from characterization by x-ray micro-computed tomography to mesoscopic modeling

Journal of Physics. Condensed Matter : an Institute of Physics Journal
Giorgio PessotAndreas M Menzel

Abstract

Ferrogels and magnetorheological elastomers are composite materials obtained by embedding magnetic particles of mesoscopic size in a crosslinked polymeric matrix. They combine the reversible elastic deformability of polymeric materials with the high responsivity of ferrofluids to external magnetic fields. These materials stand out, for example, for significant magnetostriction as well as a pronounced increase of the elastic moduli in the presence of external magnetic fields. By means of x-ray micro-computed tomography, the position and size of each magnetic particle can be measured with a high degree of accuracy. We here use data extracted from real magnetoelastic samples as input for coarse-grained dipole-spring modeling and calculations to investigate internal restructuring, stiffening, and changes in the normal modes spectrum. More precisely, we assign to each particle a dipole moment proportional to its volume and set a randomized network of springs between them that mimics the behavior of the polymeric elastic matrix. Extending our previously developed methods, we compute the resulting structural changes in the systems as well as the frequency-dependent elastic moduli when magnetic interactions are turned on. Particularly,...Continue Reading

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Citations

Sep 29, 2020·Soft Matter·Jose R Morillas, Juan de Vicente
Jun 16, 2019·International Journal of Molecular Sciences·Mayuko WatanabeTetsu Mitsumata
Sep 23, 2019·The Journal of Chemical Physics·Lukas Fischer, Andreas M Menzel

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