The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers

Ultrasoft magnetorheological elastomers (MREs) offer convenient real-time magnetic field control of mechanical properties that provides a means to mimic mechanical cues and regulators of cells in vitro. Here, we systematically investigate the effect of polymer stiffness on magnetization reversal of...

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Veröffentlicht in:APL materials 2022-04, Vol.10 (4), p.041106-041106-7
Hauptverfasser: Clark, Andy T., Marchfield, David, Cao, Zheng, Dang, Tong, Tang, Nan, Gilbert, Dustin, Corbin, Elise A., Buchanan, Kristen S., Cheng, Xuemei M.
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container_end_page 041106-7
container_issue 4
container_start_page 041106
container_title APL materials
container_volume 10
creator Clark, Andy T.
Marchfield, David
Cao, Zheng
Dang, Tong
Tang, Nan
Gilbert, Dustin
Corbin, Elise A.
Buchanan, Kristen S.
Cheng, Xuemei M.
description Ultrasoft magnetorheological elastomers (MREs) offer convenient real-time magnetic field control of mechanical properties that provides a means to mimic mechanical cues and regulators of cells in vitro. Here, we systematically investigate the effect of polymer stiffness on magnetization reversal of MREs using a combination of magnetometry measurements and computational modeling. Poly-dimethylsiloxane-based MREs with Young’s moduli that range over two orders of magnitude were synthesized using commercial polymers Sylgard™ 527, Sylgard 184, and carbonyl iron powder. The magnetic hysteresis loops of the softer MREs exhibit a characteristic pinched loop shape with almost zero remanence and loop widening at intermediate fields that monotonically decreases with increasing polymer stiffness. A simple two-dipole model that incorporates magneto-mechanical coupling not only confirms that micrometer-scale particle motion along the applied magnetic field direction plays a defining role in the magnetic hysteresis of ultrasoft MREs but also reproduces the observed loop shapes and widening trends for MREs with varying polymer stiffnesses.
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title The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers
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