New Composite Elastomers with Giant Magnetic Response

Chertovich, Alexander V.; Степанов, Г. В.; Kramarenko, Elena Yu.; Khokhlov, Alexei R.

doi:10.1002/mame.200900301

Cited by 173 publications

(150 citation statements)

References 19 publications

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“…In this case the external field contributes to further ordering of magnetic dipoles leading to strengthening of the internal chain-like structures formed within the polymer matrix after sample magnetization. Thus, the behavior is similar to the behavior of ME with SMF in the magnetic field [5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Viscoelastic Behaviorsupporting

confidence: 51%

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Magnetorheological and deformation properties of magnetically controlled elastomers with hard magnetic filler

Степанов

Chertovich

Kramarenko

2012

Journal of Magnetism and Magnetic Materials

108

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Section: Viscoelastic Behaviorsupporting

confidence: 51%

“…As magnetic fillers we used hard magnetic particles of FeNdB with a wide size distribution (1-100 mm) and the mixture of FeNdB particles with carbonyl iron powder of the average size of 3 mm. The details of the elastomer synthesis are presented elsewhere [9][10][11][12][13][14][15][16].…”

Section: Sample Preparationmentioning

confidence: 99%

Magnetorheological and deformation properties of magnetically controlled elastomers with hard magnetic filler

Степанов

Chertovich

Kramarenko

2012

Journal of Magnetism and Magnetic Materials

108

View full text Add to dashboard Cite

“…A possible route is to use particles made of a material of high remanent magnetization, for example NdFeB 61 (more than 2×10 5 A/m). Soft elastic matrices of E < ∼ 10 3 Pa can be made of silicone 23,62,63 or polydimethylsiloxane 64 . The problem is qualitatively invariant under rescaling all lengths by a characteristic dimension such as the particle radius R. Thus, the particle size is not a critical factor.…”

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confidence: 99%

Tailoring superelasticity of soft magnetic materials

Cremer

Löwen

Menzel

2015

Applied Physics Letters

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Embedding magnetic colloidal particles in an elastic polymer matrix leads to smart soft materials that can reversibly be addressed from outside by external magnetic fields. We discover a pronounced nonlinear superelastic stress-strain behavior of such materials using numerical simulations. This behavior results from a combination of two stress-induced mechanisms: a detachment mechanism of embedded particle aggregates as well as a reorientation mechanism of magnetic moments. The superelastic regime can be reversibly tuned or even be switched on and off by external magnetic fields and thus be tailored during operation. Similarities to the superelastic behavior of shape-memory alloys suggest analogous applications, with the additional benefit of reversible switchability and a higher biocompatibility of soft materials.The term "superelasticity" expresses the capability of certain materials to perform huge elastic deformations that are completely reversible 1,2 . It was initially introduced in the context of shape-memory alloys 3-5 . These metallic materials can perform large recoverable deformations due to stress-induced phase transitions. A transition to a more elongated lattice structure accommodates an externally imposed extension. Typically, this transition shows up as a pronounced "plateau-like" regime on the corresponding stress-strain curve. On this plateau, the samples are heterogeneous with domains of already transitioned material. Then, only relatively small additional stress induces a huge additional deformation. Smart material properties are observed 6-9 : upon stress release, shape-memory alloys can reversibly find back to their initial state. They self-reliantly adapt their appearance to changed environmental conditions.In the present letter, we demonstrate that an analogous phenomenological behavior can be realized for a very different class of materials, exploiting different underlying mechanisms. Moreover, we show that during operation the behavior can be reversibly tailored from outside by external magnetic fields. All of this is achieved by employing soft magnetic gels as working materials: colloidal magnetic particles embedded in a possibly swollen elastic polymer matrix 10 . Similarly to magnetic fluids 11-18 , magnetic gels allow to reversibly adjust their material properties by external magnetic fields. In this way, switching the elastic properties 19-23 offers a route to construct readily tunable dampers 24 or vibration absorbers 25 , while the possibility to switch the shape 19,26-28 allows application as soft actuators [29][30][31] . Here, we show that magnetic gels due to the interplay between magnetic and elastic interactions likewise feature superelastic behavior: it is enabled by a detachment mechanism of embedded magnetic particle aggregates and by a reorientation mechanism of magnetic moments. Both mechanisms are stress-induced and rea) Electronic mail: pcremer@thphy.uni-duesseldorf.de b) Electronic mail: menzel@thphy.uni-duesseldorf.de spond to external magnetic fields. Therefore, su...

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“…In such devices, the main exploited effect is the change of rheological characteristics and shape of MRE elements in response to the applied magnetic field or mechanical load in the real-time regime. Therefore, the dependence of the dynamic characteristics of MREs on the applied field and load is an important issue; this is demonstrated by a rather large number of published experimental works on this subject [1,2,3,4,5,6]. 2.…”

Section: Introductionmentioning

confidence: 99%