Exploiting Nonlinear Elasticity for Anomalous Magnetoresponsive Stiffening

Journal Article · Tue Oct 27 00:00:00 EDT 2020 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.0c00614· OSTI ID:1781634

Chaudhary, Gaurav  ^[1]; Bharadwaj, N. Ashwin ^[1]; Braun, Paul V.  ^[1]; Ewoldt, Randy H.  ^[1]

---

1. Univ. of Illinois at Urbana-Champaign, IL (United States)

Here, a paradigm for enhanced magnetorheological elastic materials is introduced and experimentally established. We show that a nonlinearly stiffening polymer matrix can be exploited to achieve anomalous magneto-elastomer stiffening exceeding standard magneto-elastomer theory and experiment in terms of percentage stiffness change and sensitivity to applied magnetic flux. Using a model system of a semifexible fibrin network embedded with micron sized carbonyl iron particles, we demonstrate that even at a modest particle volume fraction (0.5-4%), a coupling between the magnetically-interacting dipoles and a strain-stiffening polymer mesh provides previously unexplored opportunities for material design. Our experiments indicate that confined particles within thefibrin network internally tension and stiffen the polymer mesh when an external field is applied, resulting in a field-dependent stiffening response from the polymer mesh that superposes with the magnetic interparticle interactions.

• Research Organization: Univ. of Illinois at Urbana-Champaign, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0020858; FG02-07ER46471
• OSTI ID: 1781634
• Journal Information: ACS Macro Letters, Vol. 9, Issue 11; ISSN 2161-1653
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Stress
Polymer particles
Fluxes
Nanoparticles
Hydrogels