Magnetorheological Elastomers: Fabrication, Characteristics, and Applications

Kang, Sung Soon; Choi, Kisuk; Nam, Jae-Do; Choi, Hyoung Jin

doi:10.3390/ma13204597

Cited by 64 publications

(35 citation statements)

References 158 publications

(202 reference statements)

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“…Magnetorheological smart materials are a class of composite materials having both rheological and magnetic properties [ 11 ]. This kind of material is usually composed of ferro (i-) magnetic micro- or nanofiller and elastic polymer matrix [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

et al. 2021

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Polymer-based magnetoelectric composite materials have attracted a lot of attention due to their high potential in various types of applications as magnetic field sensors, energy harvesting, and biomedical devices. Current researches are focused on the increase in the efficiency of magnetoelectric transformation. In this work, a new strategy of arrangement of clusters of magnetic nanoparticles by an external magnetic field in PVDF and PFVD-TrFE matrixes is proposed to increase the voltage coefficient (αME) of the magnetoelectric effect. Another strategy is the use of 3-component composites through the inclusion of piezoelectric BaTiO3 particles. Developed strategies allow us to increase the αME value from ~5 mV/cm·Oe for the composite of randomly distributed CoFe2O4 nanoparticles in PVDF matrix to ~18.5 mV/cm·Oe for a composite of magnetic particles in PVDF-TrFE matrix with 5%wt of piezoelectric particles. The applicability of such materials as bioactive surface is demonstrated on neural crest stem cell cultures.

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Section: Introductionmentioning

confidence: 99%

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

et al. 2021

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“…The storage modulus for magnetic elastomers with coatings was slightly higher than that for magnetic elastomers without coatings, suggesting the occurrence of the aggregation of CI particles. At 500 mT, the storage modulus for magnetic elastomers without coatings exceeded 1 MPa, indicating that CI particles form a well-developed chain structure in the polyurethane network, as in [ 28 , 29 , 30 ]. Meanwhile, for magnetic elastomers with coatings, it significantly leveled off (1/2 of without coating).…”

Section: Resultsmentioning

confidence: 99%

Magnetorheological Response for Magnetic Elastomers Containing Carbonyl Iron Particles Coated with Poly(methyl methacrylate)

et al. 2021

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The magnetorheological response for magnetic elastomers containing carbonyl iron (CI) particles with a diameter of 6.7 μm coated with poly(methyl methacrylate) (PMMA) was investigated to estimate the diameter of secondary particles from the amplitude of magnetorheological response. Fourier-transformed infrared spectroscopy revealed that the CI particles were coated with PMMA, and the thickness of the PMMA layer was determined to be 71 nm by density measurement. The change in the storage modulus for magnetic elastomers decreased by coating and it was scaled by the number density of CI particles as ΔG~N2.8. The diameter of secondary particle of CI particles coated with PMMA was calculated to be 8.4 μm. SEM images revealed that the CI particles coated with PMMA aggregated in the polyurethane matrix.

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“…The choice of the range of filler content in the composition of MAE samples was based on the results of studies of the dependence of the relative (dielectric) permittivity and magnetic pressure (attraction of the tube walls) distribution (Figure 1a,b) [18][19][20][21]. Samples with concentrations above 70% cause difficulty to ensure homogeneous distribution of filler particles in the polymerization step because of the rapid sedimentation of the filler particles.…”

Section: Elastomer Materialsmentioning

confidence: 99%

Research on Dynamic and Mechanical Properties of Magnetoactive Elastomers with High Permeability Magnetic Filling Agent at Complex Magneto-Temperature Exposure

2021

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We consider magnetically active elastomer as a potentially applicable material for manufacturing a working channel of a magnetic pump unit. During the study, the samples were exposed to a magnetic field, a temperature field, and their combination to assess the change in the elastic-strength properties of the final material. For the preparation of samples, high permeability magnetic fillers of various sizes were used in the concentration range of 50–70%. Samples were made with an isotropic and an anisotropic structure. Studies have shown that when using a filler with a relatively coarse fraction, the material has more stable dynamic and mechanical characteristics: the tensile strength of the sample increases by an average of 38%. With the combined effect of magnetic and temperature fields on the material, its elasticity and strength increase by an average of 30% in comparison with the material without external influence. Based on the results obtained, the composition and structural organization of the material, which has the best complex of elastic strength characteristics, has been substantiated. For the manufacture of a pumping unit tube, it is preferable to use an isotropic magnetoactive elastomer with a coarser filler content of about 60%.

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Magnetorheological Elastomers: Fabrication, Characteristics, and Applications

Cited by 64 publications

References 158 publications

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

Magnetorheological Response for Magnetic Elastomers Containing Carbonyl Iron Particles Coated with Poly(methyl methacrylate)

Research on Dynamic and Mechanical Properties of Magnetoactive Elastomers with High Permeability Magnetic Filling Agent at Complex Magneto-Temperature Exposure

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