Magnetorheological elastomers: Electric properties versus microstructure

Moučka, Robert; Sedlačík, Michal; Kutálková, Eva

doi:10.1063/1.5060697

Cited by 7 publications

(11 citation statements)

References 17 publications

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“…The weakening of anisotropy in MRE with 20 wt % of CIPs was caused by the growing viscosity of the MRE mixtures before the curing process. Meanwhile, in another study, the author observed that the dielectric relaxations linked to a specific cluster morphology were identified as the manifestation of charge transport by using a variable range hopping (VRH) mechanism along the chain-like structures [17]. However, the study was limited to the investigation of only the rheological properties; the electrical properties such as the conductivity and resistivity of the Gr-MRE in contact with the external input such as the applied force were not considered notwithstanding the significant effect of the Gr on the electric and conductive properties.…”

Section: Introductionmentioning

confidence: 99%

Material Characterizations of Gr-Based Magnetorheological Elastomer for Possible Sensor Applications: Rheological and Resistivity Properties

et al. 2019

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Considering persistent years, many researchers continuously seek an optimum way to utilize the idea of magnetorheology (MR) materials to be practically used for everyday life, particularly concerning resistivity sensing application. The rheology and resistivity of a graphite (Gr)-based magnetorheological elastomer (Gr-MRE) were experimentally evaluated in the present research. Magnetorheological elastomer (MRE) samples were prepared by adding Gr as a new additive during MRE fabrication. The effect of additional Gr on the rheological and resistivity properties were investigated and compared with those of typical MREs without a Gr additive. Morphological aspects of Gr-MRE were characterized using field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). Rheological properties under different magnetic fields were evaluated using a parallel-plate rheometer. Subsequently, the resistivity of all samples was measured under different applied forces and magnetic fields. From the resistivity evaluation, two relationship curves resistance (R) under different applied forces (F) and different magnetic fields (B) were established and plotted by using an empirical model. It was observed from the FESEM images that the presence of Gr fractions arrangement contributes to the conductivity of MRE. It was also observed that, with the addition of Gr, rheological properties such as the field-dependent modulus can be improved, particularly at low strain amplitudes. It is also demonstrated that the addition of Gr in MRE can contribute to the likely use of force detection in tactile sensing devices.

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Section: Introductionmentioning

confidence: 99%

Material Characterizations of Gr-Based Magnetorheological Elastomer for Possible Sensor Applications: Rheological and Resistivity Properties

et al. 2019

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“…Where ϕ 2 is the volume fraction of graphene, ϕ c 2 is the percolation threshold of graphene, σ h 2 is the conductivity of graphene sheet (σ h 2 = 1:2 × 10 6 S=m ), σ m 2 is the conductivity of GR/RTV-MRE, t 2 is the seepage coefficient of effective medium equation. Finally, the relationship between the volume fraction of graphene and the conductivity of GR/RTV-MRE can be obtained by substituting Equation (1) into Equation (2).…”

Section: Conductivity Model Of Gr/rtv-mrementioning

confidence: 99%

“…Therefore, MREs are also regarded as a kind of conductive composites, and its conductive mechanism and magnetoelectric properties are widely concerned by domestic and foreign researchers. [1][2][3] Bica [4][5][6][7] studied the conductivity of MREs under magnetic field. The results show that along the direction of magnetic field, the resistance of MREs decreases with the increase of magnetic field intensity, which proves that MREs have obvious magnetoresistivity.…”

Section: Introductionmentioning

confidence: 99%

Magneto‐piezoresistive characteristics of graphene/room temperature vulcanized silicon rubber‐silicon rubber magnetorheological elastomer

Zhao

Cui

Dai³

et al. 2020

J of Applied Polymer Sci

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The effect of graphene with different content on the magneto‐piezoresistive characteristics of graphene/room temperature vulcanized silicon rubber (GR/RTV) magnetorheological elastomer (MRE) was studied, and the relationship between the content of graphene and conductivity of GR/RTV‐MRE was described based on the general effective medium theory. A magneto‐piezoresistive model was established to describe the relationship among resistance, pressure, and magnetic field based on the magnetic dipole and tunneling theory. The samples of GR/RTV‐MRE with different content of graphene were prepared. The experimental platform with magneto‐piezoresistive characteristics controlled by magnetic field was built. The effect of graphene with different content on piezoresistive coefficient of GR/RTV‐MRE was obtained under different magnetic flux density. The experimental results showed that the piezoresistive coefficients of samples with different content of graphene decrease with the increase of magnetic flux density in the range of 0 ~ 80mT. For the same magnetic field, when the volume fraction of graphene is less than 12%, the piezoresistive coefficient is positively correlated with it, when the volume fraction of graphene is more than 12%; the increase of content has little effect on the piezoresistive characteristics. The experimental results are compared with theoretical calculations for correction and error analysis. The results showed that the modified model can well describe the variation of the resistance of GR/RTV‐MRE under magnetic field and pressure.

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“…Materials exhibiting the electrorheological effect, and their analogues–magnetorheological materials, are typical representatives of smart materials that are extremely promising for application in various industrial devices, including vibration absorbers, dampers, etc. [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Electrorheological Properties of Polydimethylsiloxane/TiO2-Based Composite Elastomers

et al. 2020

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Electrorheological elastomers based on polydimethylsiloxane filled with hydrated titanium dioxide with a particle size of 100–200 nm were obtained by polymerization of the elastomeric matrix, either in the presence, or in the absence, of an external electric field. The viscoelastic and dielectric properties of the obtained elastomers were compared. Analysis of the storage modulus and loss modulus of the filled elastomers made it possible to reveal the influence of the electric field on the Payne effect in electrorheological elastomers. The elastomer vulcanized in the electric field showed high values of electrorheological sensitivity, 250% for storage modulus and 1100% for loss modulus. It was shown, for the first time, that vulcanization of filled elastomers in the electric field leads to a significant decrease in the degree of crosslinking in the elastomer. This effect should be taken into account in the design of electroactive elastomeric materials.

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Magnetorheological elastomers: Electric properties versus microstructure

Cited by 7 publications

References 17 publications

Material Characterizations of Gr-Based Magnetorheological Elastomer for Possible Sensor Applications: Rheological and Resistivity Properties

Material Characterizations of Gr-Based Magnetorheological Elastomer for Possible Sensor Applications: Rheological and Resistivity Properties

Magneto‐piezoresistive characteristics of graphene/room temperature vulcanized silicon rubber‐silicon rubber magnetorheological elastomer

Electrorheological Properties of Polydimethylsiloxane/TiO2-Based Composite Elastomers

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