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• W3104013003 endingPage "125101" @default.
• W3104013003 startingPage "125101" @default.
• W3104013003 abstract "Ferrogels and magnetoelastomers 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 large magnetostriction as well as significant increase of the elastic moduli in the presence of external magnetic fields. By means of X-ray micro-computed tomography, 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 magnetostriction, 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, their overall distortions, as well as the frequency-dependent elastic moduli when magnetic interactions are turned on. Particularly, with increasing magnetization, we observe the formation of chain-like aggregates, resulting in significant overall deformations. Interestingly, the static elastic moduli can first show a slight decrease with growing amplitude of the magnetic interactions, before a pronounced increase appears upon the chain formation. The change of the dynamic moduli with increasing magnetization depends on the frequency and can even show nonmonotonic behavior. Overall, we demonstrate how theory and experiments can complement each other to learn more about the dynamic behavior of this interesting class of materials." @default.
• W3104013003 created "2020-11-23" @default.
• W3104013003 creator A5010599705 @default.
• W3104013003 creator A5021560918 @default.
• W3104013003 creator A5028221319 @default.
• W3104013003 creator A5033269029 @default.
• W3104013003 creator A5045564442 @default.
• W3104013003 creator A5051254979 @default.
• W3104013003 date "2018-02-23" @default.
• W3104013003 modified "2023-10-16" @default.
• W3104013003 title "Tunable dynamic moduli of magnetic elastomers: from characterization by x-ray micro-computed tomography to mesoscopic modeling" @default.
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