Analysis of Styrene-Butadiene Based Thermoplastic Magnetorheological Elastomers with Surface-Treated Iron Particles

Tagliabue, Arturo; Eblagon, Fernando; Clemens, Frank

doi:10.3390/polym13101597

Cited by 13 publications

(18 citation statements)

References 24 publications

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“…Studies employing SEBS as matrix with CI microparticles have reported an MR effect of around 5% for volume fractions of 10% 39 . Hence, the MR effect presented in this work is outstanding, not just for the MR response per se, but also for the fact of obtaining this response with NPs with lower saturation magnetization 38 and much smaller percentage.…”

Section: Resultsmentioning

confidence: 63%

“…Studies employing SEBS as matrix with CI microparticles have reported an MR effect of around 5% for volume fractions of 10%. 39 Hence, the MR effect presented in this work is outstanding, not just for the MR response per se, but also for the fact of obtaining this response with NPs with lower saturation magnetization 38 and much smaller percentage. The improve MR response is attributed to the weaker dipolar magnetic interaction between the particles, leading the SEBS matrix to a lower interfacial stress in the surroundings of those magnetic inclusions, which is a determining factor in the performance of these composites.…”

Section: Magnetorheological Propertiesmentioning

confidence: 84%

“…The magnitude of the MR effect was determined as the percentage change in the storage modulus of the sample with and without the applied magnetic field 39 :

normalM R_{effect} (() %) goodbreak= \frac{G^{'} ((), H) - G' ((), H goodbreak= 0)}{G' ((), H goodbreak= 0)} goodbreak\times 100

…”

Section: Resultsmentioning

confidence: 99%

“…The magnitude of the MR effect was determined as the percentage change in the storage modulus of the sample with and without the applied magnetic field 39 :…”

Section: Magnetorheological Propertiesmentioning

confidence: 99%

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Tuning magnetorheological functional response of thermoplastic elastomers by varying soft‐magnetic nanofillers

Tubío

2022

Polymers for Advanced Techs

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Magnetorheological elastomers (MREs) are increasingly demanded based on their ability to modify their mechanical properties under an applied magnetic field, applications ranging from active control in industrial processes to biomedicine. Those materials are based on a polymer phase and magnetic fillers. This work reports on the evaluation of the effect of the magnetic filler characteristics on the physical-chemical and functional performance of MREs. Composites have been produced with 20 wt% concentration of six different magnetic fillers: CoFe 2 O 4 , Fe 3 O 4 , Co, Ni, and Ni 80 Fe 17 Mo 3 (Permalloy) in a SEBS matrix. Elastic modulus increases from 0.7 MPa for the pristine polymer to a maximum value of 1.8 MPa for the sample with Fe 3 O 4 .The highest saturation magnetization being obtained for the composite containing magnetite, with 17.8 A m 2 kg À1 . The filler size, saturation magnetization and coercivity all have significant impact on the magnetorheological (MR) effect. The highest MR effect is achieved when using Fe 3 O 4 nanoparticles (17%), followed by Co (16%), Ni (14%), CoFe 2 O 4 (11%), and finally Permalloy (8%). For the Fe 3 O 4 @SEBS composite, the MR response is among the largest reported in the literature but with a much lower filler content (6 vol% versus more than 20 vol%), with a positive effect on processability and integration into devices.

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Section: Resultsmentioning

confidence: 63%

Section: Magnetorheological Propertiesmentioning

confidence: 84%

“…The magnitude of the MR effect was determined as the percentage change in the storage modulus of the sample with and without the applied magnetic field 39 :

normalM R_{effect} (() %) goodbreak= \frac{G^{'} ((), H) - G' ((), H goodbreak= 0)}{G' ((), H goodbreak= 0)} goodbreak\times 100

…”

Section: Resultsmentioning

confidence: 99%

“…The magnitude of the MR effect was determined as the percentage change in the storage modulus of the sample with and without the applied magnetic field 39 :…”

Section: Magnetorheological Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Tuning magnetorheological functional response of thermoplastic elastomers by varying soft‐magnetic nanofillers

Tubío

2022

Polymers for Advanced Techs

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show abstract

“…Thus, the magnitude of the MR effect has been determined as the percentage change in the storage modulus of the sample with and without the applied maximum magnetic field: MR effect ( % ) = G ′ ( H = 775 mT ) − G ′ ( H = 0 ) G ′ ( H = 0 ) × 100 …”

Section: Resultsmentioning

confidence: 99%

Ternary Multifunctional Composites with Magnetorheological Actuation and Piezoresistive Sensing Response

Fernández Maestu,

García Díez,

Tubio

et al. 2023

ACS Appl. Electron. Mater.

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Advances in the development and implementation of magnetorheological elastomers (MREs) have demonstrated their potential for vibration control and damping, among others. To increase further the applicability of MREs, the present work reports on MREs with piezoresistive self-sensing characteristics by adding conductive fillers. Multifunctional MREs are thus reported based on the styrene–ethylene–butylene–styrene (SEBS) polymer matrix with embedded Fe3O4 nanoparticles as magnetically responsive materials and multiwalled carbon nanotubes (MWCNT) as conductive fillers. Specifically, SEBS-based composites with a constant 20 wt % Fe3O4 content and different concentrations of MWCNT have been prepared. The effect of MWCNT addition on the morphological, mechanical, electrical, magnetorheological, and piezoresistive properties of the MRE-based composites was explored. Increasing MWCNT filler content leads to an increase of the Young’s modulus and maximum elongation of the composite. All samples show a notable MR effect, a maximum MR response of 9% being obtained for the 5 wt % MWCNT sample. Moreover, the addition of MWCNT leads to an increase of the electrical conductivity of the composite by 12 orders of magnitude, with a percolation threshold around 0.17 wt % MWCNT. Further, a maximum piezoresistive response characterized by a gauge factor of 6.5 is obtained for the composite with 5 wt % MWCNT content. The developed ternary multifunctional materials that combine simultaneously magnetorheological and piezoresistive properties represent a generation of magnetorheological actuators with self-sensing deformation capability.

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Thermoplastic Elastomers for Wireless, Skin‐Interfaced Electronic, and Microfluidic Devices

Wu,

Liu,

Lapiere

et al. 2023

Adv Materials Technologies

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Wireless, skin‐interfaced electronic and microfluidic devices have the potential to replace wired, bulky, and cumbersome technologies for personal and clinical health monitoring, allowing care to extend from hospital settings to the home. For use on skin, these devices commonly employ silicone‐based thermoset elastomers (TSEs) as layers that encapsulate the electronics or serve as molded microchannels for biofluid (e.g., sweat) capture, storage, and analysis. Barriers to commercial adoption of such devices include difficulties in use of these elastomers in conventional practices for mass manufacturing. Their relatively high cost and inability to allow for recycling represent additional disadvantages. By contrast, thermoplastic elastomers (TPEs) are fully compatible with industrial‐scale manufacturing processes, low in cost, and recyclable. Like TSEs, TPEs are soft, stretchable, flexible, and optically transparent, while possessing other properties well‐suited for applications in wireless, skin‐interfaced devices. Herein, the characteristics, processing, and application techniques for three commercially available TPEs, including two thermoplastic polyurethanes as encapsulation layers for a wireless skin hydration sensor and one thermoplastic styrenic block copolymer for a microfluidic sweat analysis platform, are reported. The results demonstrate that TPEs can be effectively integrated into these classes of devices, as a compelling alternative to TSEs, as a mass‐manufacturable, sustainable materials option.

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Analysis of Styrene-Butadiene Based Thermoplastic Magnetorheological Elastomers with Surface-Treated Iron Particles

Cited by 13 publications

References 24 publications

Tuning magnetorheological functional response of thermoplastic elastomers by varying soft‐magnetic nanofillers

Tuning magnetorheological functional response of thermoplastic elastomers by varying soft‐magnetic nanofillers

Ternary Multifunctional Composites with Magnetorheological Actuation and Piezoresistive Sensing Response

Thermoplastic Elastomers for Wireless, Skin‐Interfaced Electronic, and Microfluidic Devices

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