Matrix dependence of the linear viscoelastic region in magnetorheological elastomers

Agirre-Olabide, Iker; Elejabarrieta, María Jesús; Bou-Ali, M. Mounir

doi:10.1177/1045389x15580658

Cited by 37 publications

(32 citation statements)

References 25 publications

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“…The samples were subjected to torsional deformation generated by a periodic oscillatory rotation of the upper rheometer plate. A strain amplitude of 0.01% was used in the frequency sweep tests to guarantee that all tests were performed in the linear viscoelastic (LVE) region [28,29]. The frequency range of 0.1-40 Hz was analysed and divided into two steps; the first one from 0.1 to 10 Hz, and the second one from 10 to 40 Hz.…”

Section: 2mentioning

confidence: 99%

Linear magneto-viscoelastic model based on magnetic permeability components for anisotropic magnetorheological elastomers

Agirre-Olabide¹,

Kuzhir²,

Elejabarrieta³

2018

Journal of Magnetism and Magnetic Materials

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International audienceThe storage modulus variation of anisotropic magnetorheological elastomers (MREs) induced by an external magnetic field was modelled in the frequency domain. This involves synthesising five anisotropic MREs with different particle content and measuring its dynamic and magnetic properties. Dynamic properties were measured using a rheometer equipped with a magnetorheological cell and the magnetic permeability of each sample was measured with a vibrating sample magnetometer. Scanning Electron Microscope images were used to determine particle distribution. A four parameter fractional derivative model was used to describe MRE viscoelasticity in the absence of magnetic field and the fitting error was not larger than 1%. Magneto-induced modulus was also studied and two different models were analysed, the one of Jolly et al. (Smart Mater Struct;5:607 (1999)) and the other one of López-López et al. (J Rheol. 56:1209 (2012)). The first model underestimated the influence of the magnetic field for low particle contents while at high ones it overestimated the magnetic field effect, up to 13%. However, in the second model magnetic permeability values were used, and the error between the model prediction and experimental data did not exceed 7%. Hence, a new linear magneto-viscoelastic model was proposed in frequency domain for anisotropic MREs based on López-López et al. model, which predicts the effect of magnetic field on the dynamic shear modulus in function of particle content and frequency

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Section: 2mentioning

confidence: 99%

Linear magneto-viscoelastic model based on magnetic permeability components for anisotropic magnetorheological elastomers

Agirre-Olabide¹,

Kuzhir²,

Elejabarrieta³

2018

Journal of Magnetism and Magnetic Materials

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“…In order to better analyze this effect, we plotted the average values of G' and G'' corresponding to the LVR as a function of the concentration of magnetic particles(Figure 5b). At this point it is important to note that different criteria can be found in the literature to define the extension of the LVR[30]. In this work we used the criteria of[31], which defined the limit of the LVR as the point where the storage modulus deviates 10 % from the plateau value.…”

mentioning

confidence: 99%

Rheology of magnetic alginate hydrogels

Gila-Vilchez

Bonhome-Espinosa

Kuzhir

et al. 2018

Journal of Rheology

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Magnetic hydrogels are becoming increasingly demanded for technical and biomedical applications, especially for tissue engineering purposes. Among them, alginate-based magnetic hydrogels emerge as one of the preferred formulations, due to the abundance, low cost and biocompatibility of alginate polymers. However, their relatively slow gelation kinetics provokes strong particle settling, resulting in nonhomogeneous magnetic hydrogels. Here we study magnetic hydrogels prepared by a novel two-step protocol that allows obtaining macroscopically homogeneous systems, consisting of magnetic microparticles embedded within the alginate network. We describe a comprehensive characterization (morphology, microstructure and mechanical properties under shear stresses) of the resulting magnetic hydrogels. We 2 pay special attention to the effects of particle volume fraction (up to 0.33) and strength of the magnetic field on the viscoelastic properties of the magnetic hydrogels. Our results indicate that magnetic hydrogels are strongly strengthened against shear stresses as magnetic particle concentration and applied field intensity increase. Finally, we report an adaptation of the two-step protocol for the injection of the magnetic hydrogels that might be adequate for implementation in vivo. Interestingly, injected magnetic hydrogels present similar morphology and mechanical properties to noninjected hydrogels. To conclude, we report magnetic alginate hydrogels with adequate homogeneity and injectability character. These characteristics, together with the broad range of their mechanical properties, make them perfect candidates for cutting-edge technology.

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“…To take advantage of the large deformation exhibited by soft polymers, many materials such as gold nanorods, carbon nanotubes, graphene and ferromagnetic particles, had been used as promising candidates in terms of fabrication of polymer‐based composites. Correspondingly, the physical and mechanical properties of polymer composites can be tailored by external electrical, heat, light, or magnetic stimuli.…”

Section: Introductionmentioning

confidence: 99%

“…Correspondingly, the physical and mechanical properties of polymer composites can be tailored by external electrical, heat, light, or magnetic stimuli. Recently, ferromagnetic particle‐reinforced elastomers, also known as magneto‐rheological elastomers, magneto‐active polymers or soft magnetic elastomers, have attracted increasing attentions because of their excellent magneto‐mechanical performance . As one of such smart elastomers, the particle‐reinforced soft composites (PRSCs) with micron‐scale magnetizable particles solidified in a synthetic rubber have widely potential applications such as vibration dampers and actuating devices …”

Section: Introductionmentioning

confidence: 99%

“…In most cases, polymer composites with ferromagnetic particles are subjected to dynamic load in practical applications, and the corresponding dynamic viscoelastic behaviors, especially the storage modulus and loss factor, have been extensively characterized experimentally. Based on Rheometry, dynamic mechanical analyzer, some researchers have studied the effects of the composition of mixtures, the measuring conditions (e.g., strain amplitudes and frequencies), and the particle–matrix interfacial adhesion on viscoelastic properties and macroscopic overall responses of the composites. Currently, some researches also investigated the wettability and adhesion properties of the film surfaces of PRSCs and used as the soft gripper .…”

Section: Introductionmentioning

confidence: 99%

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Quasi‐static and dynamic nanoindentation of particle‐reinforced soft composites

Wang

Wei

Wang

et al. 2016

J of Applied Polymer Sci

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The mechanical properties of ferromagnetic particle-reinforced silicone-rubber matrix composites are examined with quasi-static and dynamic nanoindentation measurements using Berkovich and flat punch indenters, respectively. Quasi-static nanoindentation is performed to examine primary factors such as the loading and holding time, particle volume fraction, and indentation depth for these particle-reinforced soft composites (PRSCs). The Einstein-Guth-Smallwood equation based on macroscopically mechanical property testing is utilized to describe the relationship between elastic modulus and particle content of PRSCs in quasistatic tests. A good agreement between the nanoindentation and simulation prediction is obtained. To characterize the storage modulus and loss factors of PRSCs, the dynamic nanoindentation is then conducted over the force frequency range of 0-45 Hz to show that the dynamic properties are dominated by the particle content and the force frequency, and independent of indentation depth and oscillation amplitude. It is indicated that the nanoindentation is a versatile methodology to assess mechanical properties of microsized particulate soft composites.

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Matrix dependence of the linear viscoelastic region in magnetorheological elastomers

Cited by 37 publications

References 25 publications

Linear magneto-viscoelastic model based on magnetic permeability components for anisotropic magnetorheological elastomers

Linear magneto-viscoelastic model based on magnetic permeability components for anisotropic magnetorheological elastomers

Rheology of magnetic alginate hydrogels

Quasi‐static and dynamic nanoindentation of particle‐reinforced soft composites

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