Magnetic anisotropy in magnetoactive elastomers, enabled by matrix elasticity

Боднарук, А.В.; Brunhuber, Alexander; Каліта, В. М.; Kulyk, M. M.; Kurzweil, Peter; Snarskiı̆, A. A.; Lozenko, A. F.; Ryabchenko, S. M.; Shamonin, Mikhail

doi:10.1016/j.polymer.2018.12.027

Cited by 30 publications

(27 citation statements)

References 73 publications

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“…The soft-magnetic carbonyl iron powder (CIP) type SQ (mean particle size d50 of 4.5 μm, no coating), provided by BASF SE Carbonyl Iron Powder & Metal Systems (Ludwigshafen, Germany), was used as the ferromagnetic filler. Magnetic properties of CIPs and MAEs with similar concentrations of iron particles can be found in [ 56 , 57 , 58 ]. The X-ray diffraction (XRD) analysis of CIPs was reported, e.g., in [ 59 , 60 , 61 ].…”

Section: Methodsmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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Elongations of magnetoactive elastomers (MAEs) under ascending–descending uniform magnetic fields were studied experimentally using a laboratory apparatus specifically designed to measure large extensional strains (up to 20%) in compliant MAEs. In the literature, such a phenomenon is usually denoted as giant magnetostriction. The synthesized cylindrical MAE samples were based on polydimethylsiloxane matrices filled with micrometer-sized particles of carbonyl iron. The impact of both the macroscopic shape factor of the samples and their magneto-mechanical characteristics were evaluated. For this purpose, the aspect ratio of the MAE cylindrical samples, the concentration of magnetic particles in MAEs and the effective shear modulus were systematically varied. It was shown that the magnetically induced elongation of MAE cylinders in the maximum magnetic field of about 400 kA/m, applied along the cylinder axis, grew with the increasing aspect ratio. The effect of the sample composition is discussed in terms of magnetic filler rearrangements in magnetic fields and the observed experimental tendencies are rationalized by simple theoretical estimates. The obtained results can be used for the design of new smart materials with magnetic-field-controlled deformation properties, e.g., for soft robotics.

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Section: Methodsmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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“…In the high-frequency limit (f → ∞), the impedance of the equivalent circuit is determined by the corresponding capacitances. Magnetic field changes the arrangement of filler particles in such a way that they aggregate preferentially in the field direction, which has been experimentally verified in the past by measurements of magnetic anisotropy [29]. The resistance of the resulting aggregate grows, which is more significant at lower frequencies.…”

Section: Resultsmentioning

confidence: 93%

Magnetodielectric Response of Soft Magnetoactive Elastomers: Effects of Filler Concentration and Measurement Frequency

Kostrov

Shamonin

Степанов

et al. 2019

IJMS

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The magnetodielectric response of magnetoactive elastomers (MAEs) in its dependence on filler concentration, magnetic field, and test frequency is studied experimentally. MAEs are synthesized on the basis of a silicone matrix filled with spherical carbonyl iron particles characterized by a mean diameter of 4.5 µm. The concentration of the magnetic filler within composite materials is equal to 70, 75, and 80 mass%. The effective lossless permittivity ε′ as well as the dielectric loss tanδ grow significantly when the magnetic field increases. The permittivity increases and the dielectric loss decreases with increasing filler concentration. In the measurement frequency range between 1 kHz and 200 kHz, the frequency hardly affects the values of ε′ and tanδ in the absence of a magnetic field. However, both parameters decrease considerably with the growing frequency in a constant magnetic field. The more strongly the magnetic field is applied, the larger the change in permittivity and loss tangent at the same test frequency is observed. An equivalent circuit formulation qualitatively describes the main tendencies of the magnetodielectric response.

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“…As above, we describe RS as a change in the percolation threshold in a magnetic field (7). To calculate the effective properties, the nonlinear system of equations (11) Figure 4 shows the results of the calculation of the effective magnetic permeability according to the modified BL equation taking into account the nonlinearity and dependence of the percolation threshold on the magnetic field and the experimental dependences obtained in [11,18]. In Fig.…”

Section: Effective Properties Taking Into Account Both Nonlinearimentioning

confidence: 99%

“…Any physical property related to the arrangement of inclusions within the composite material will change [16]. If the matrix is soft (Young's modulus is smaller than approximately 30 kPa), the RS of the particulate filler can be significant even at moderate (100 -300 mT) magnetic flux densities [7,11,[17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Theoretical method for calculation of effective properties of composite materials with reconfigurable microstructure: Electric and magnetic phenomena

Snarskiı̆

Zorinets

Shamonin

et al. 2019

Physica A: Statistical Mechanics and its Applications

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We propose a theoretical approach for calculating effective electric and magnetic properties of composites with field-dependent restructuring of the filler. The theory combines the Bruggeman-Landauer approximation extended to a field-dependent (variable) percolation threshold with the approximate treatment of nonlinearity of material properties. Theoretical results are compared with experiments on magnetorheological elastomers, which in the context of investigated phenomena are often called magnetoactive elastomers (MAEs). In MAEs with soft polymer matrices, the mutual arrangement of inclusions changes in an applied magnetic field. This reorganization of the microstructure leads to unconventionally large changes of electrical and magnetic properties. Obtained theoretical results describe observed phenomena in MAEs well. Qualitative agreement between theory and experiment is demonstrated for the magnetodielectric effect. In the case of magnetic permeability, quantitative agreement is achieved. The theoretical approach presented can be useful for development of field-controlled smart materials and design of smart structures on their basis, because the field dependence of physical properties can be predicted.

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Magnetic anisotropy in magnetoactive elastomers, enabled by matrix elasticity

Cited by 30 publications

References 73 publications

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Magnetodielectric Response of Soft Magnetoactive Elastomers: Effects of Filler Concentration and Measurement Frequency

Theoretical method for calculation of effective properties of composite materials with reconfigurable microstructure: Electric and magnetic phenomena

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