Evaluation of highly compliant magneto‐active elastomers with colossal magnetorheological response

Stoll, Andrea; Mayer, Michael; Monkman, Gareth J.; Shamonin, Mikhail

doi:10.1002/app.39793

Cited by 92 publications

(81 citation statements)

References 39 publications

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“…For instance, Péter et al reported a 6% change using Co–Cu/Cu multilayer system with superparamagnetic regions on a silicon wafer . Nevertheless, the magnitude of the magnetoresistive effect presented here is lower than that observed in our group for structured dispersions of superparamagnetic fillers in PDMS (e.g., 50% at 1.5 kOe) and also for systems reported by other groups using conductive and nonconductive polymer matrices . In the case of PANI and epoxy nonstructured matrices using superparamagnetic Fe 3 O 4 as fillers, large and giant magnetoresistance effects have been reported, and the origin of magnetoresistance effects in those disordered systems was assigned to quantum effects, including variable range hopping (VRH) processes .…”

Section: Resultscontrasting

confidence: 77%

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Ruiz

Marchi

Pérez

et al. 2015

J Polym Sci B Polym Phys

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Structured elastomer films (100-150 mm) presenting piezo and magneto resistance are described. The films are composites of filler particles, which are both electrically conductive and magnetic, dispersed in an elastomeric matrix. The particles consist of magnetite (6 nm) grouped in silver-coated aggregates (Fe 3 O 4 @Ag). The matrix is styrene-butadiene rubber (SBR) in which diethylene glycol (DEG) is added. The particles, SBR and DEG, are dispersed in toluene and then placed between two rare earth magnets. Formation of pseudo-chains (needles) of inorganic material aligned in the direction of the magnetic field is obtained after solvent evaporation. The addition of DEG is substantial to obtain an electrically conductive material. The electrical conductivity is anisotropic and increases when applying normal stresses and/or magnetic fields in the direction of the needles. The elastomers, particles, and needless were characterized by XRD, SEM, EDS, FTIR, DSC, TGA, VSM, profilometry, and stress-strain analysis.V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000 KEYWORDS: composites; elastomers; magnetoresistive composites; piezoresistive elastomers; sensors; structured elastomers INTRODUCTION Structured elastomer composites with anisotropic properties, such as magneto and piezoresistivity, are becoming of great interest for their potential applications in physical sensors, flexible devices, and electronic connectors. [1][2][3][4][5][6][7][8][9] In addition to common challenges for technological application of smart materials (obtaining appropriated quality parameters), there are specific difficulties in the case of structured elastomeric composites: (i) to develop ohmic contacts with good adherence to the elastomer; (ii) to obtain a reversible response (dependent on the elastic behavior); and (iii) to prepare submillimeter films displaying the physical properties of interest. The first two issues (contacts and reversibility) have been addressed in previous works of our group, using magnetorheological elastomers based on dispersions of magnetic nanomaterials in polydimethylsiloxane

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Section: Resultscontrasting

confidence: 77%

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Ruiz

Marchi

Pérez

et al. 2015

J Polym Sci B Polym Phys

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“…[7] In addition to the aforementioned, magnetic fields have the ability to penetrate space and substances. The term magnetoactive elastomers has been used by several research groups, [11][12][13][14][15] in which the stiffness of an elastic matrix inserted with magnetizable particles is able to be controlled by the implementation of an external magnetic field. [8] In general, magnetically activated smart materials comprise at least two kinds of material having different magnetic properties or where one is not even a solid magnetic material.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Magnetorheological Solids: Materials, Fabrication, Testing, and Applications

et al. 2014

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Magnetorheological (MR) materials are classified as smart materials due to their responsiveness to external magnetic stimuli. Intensive research on MR materials has led to broad applications in several potential fields. A solid carrier matrix state called MR elastomer with its exceptional magnetic responsive feature is obtained by merging magnetizable particles within an elastomeric polymer. This integration results in outstanding characteristics on the rheological performances. Special prominence is given to the understanding of the base materials and fabrication as well as the functional behavior through various characterization methods. Broad applications of MREs are also explored to provide a profound market picture and to motivate researchers to develop novel technology.

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“…Magnetorheological effect is very promising for design of tunable vibration absorbers on the basis of MRE, some of them have been already developed and patented . Recently developed MRE with a low initial storage modulus between 100 and 2 000 Pa and a colossal magnetorheological effect of >10 6 % are proposed to use as cell substrates with magnetically tunable rigidity …”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Properties of Magnetorheological Elastomers for Damping Applications

Молчанов

Степанов

Vasiliev

et al. 2014

Macro Materials & Eng

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Magnetorheological elastomers (MRE) have been synthesized on the basis of a silicon compound and a mixture of carbonyl iron particles of sizes 3–5 and 40–80 μm. Their viscoelastic properties have been studied by dynamic shear oscillations of various amplitudes on a stress controlled rheometer. The magnetic response of the obtained materials has been examined in a magnetic field applied perpendicular to the shear plane. It has been shown that under applied magnetic field both the storage G′ and loss G″ moduli became strain‐dependent. The values of G′ and G″ decrease with strain, while their ratio (the loss factor), G″/G′, growths with strain. The higher magnetic field is the more pronounced the strain dependence is. At small strain (up to 1%) MRE demonstrate a giant (more than 10 times) increase of the moduli. Some features of hysteretic behavior of MRE under simultaneously applied magnetic field and external mechanical force have been elucidated. Temperature has a negligible effect on viscoelastic properties and stability of the developed MRE. A damper on the basis of MRE has been designed and its properties have been examined.

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Evaluation of highly compliant magneto‐active elastomers with colossal magnetorheological response

Cited by 92 publications

References 39 publications

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

Recent Progress on Magnetorheological Solids: Materials, Fabrication, Testing, and Applications

Viscoelastic Properties of Magnetorheological Elastomers for Damping Applications

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