The effect of polymer stiffness on magnetization reversal of magnetorheological elastomers
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[4]
- Bryn Mawr College 1,Bryn Mawr, PA (United States); OSTI
- Colorado State University, Fort Collins, CO (United States)
- University of Delaware, Newark, DE (United States)
- Bryn Mawr College 1,Bryn Mawr, PA (United States)
- University of Tennessee, Knoxville, TN (United States)
- University of Delaware, Newark, DE (United States); Nemours/Alfred I. duPont Hospital for Children, Wilmington, DE (United States)
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.
- Research Organization:
- University of Tennessee, Knoxville, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of General Medical Science (NIGMS); National Institutes of Health; State of Delaware
- Grant/Contract Number:
- SC0021344
- OSTI ID:
- 1979056
- Alternate ID(s):
- OSTI ID: 1863116
- Journal Information:
- APL Materials, Journal Name: APL Materials Journal Issue: 4 Vol. 10; ISSN 2166-532X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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