Author's Final Manuscript
We report tuning of the moduli and surface roughness of magnetorheological elastomers (MREs) by varying applied magnetic field. Ultrasoft MREs are fabricated using a physiologically relevant commercial polymer, SylgardTM 527, and carbonyl iron powder (CIP). We found that the shear storage modulus, Young's modulus, and root-mean-square surface roughness are increased by ∼41×, ∼11×, and ∼11×, respectively, when subjected to a magnetic field strength of 95.5 kA m−1. Single fit parameter equations are presented that capture the tunability of the moduli and surface roughness as a function of CIP volume fraction and magnetic field strength. These magnetic field-induced changes in the mechanical moduli and surface roughness of MREs are key parameters for biological applications.
Clark, A. T., Bennett, A., Kraus, E., Pogoda, K., Cēbers, A., Janmey, P., Turner, K. T., Corbin, E. A., and X. Cheng. 2021. "Magnetic field tuning of mechanical properties of ultrasoft PDMS-based magnetorheological elastomers for biological applications." Multifunct. Mater. 4.3: 035001.