How does the dual modification of carbonyl iron particles (CIP) with polydopamine (PDA) and isobutyl (trimethoxy)silane (IBTMO) enhance the performance of magnetorheological elastomers (MREs)?

Label:chem

Topic
Magnetorheological elastomers (MREs) are smart materials that exhibit tunable stiffness and rapid responsiveness to magnetic fields. However, weak interfacial interactions and poor dispersion of magnetic particles within the polymer matrix often limit their performance. In this study, carbonyl iron powder (CIP) was chemically modified with polydopamine (PDA) and isobutyl (trimethoxy)silane (IBTMO) to enhance its compatibility with a silicone-based matrix.
Answer
The dual modification of CIP with PDA and IBTMO improves the dispersion of CIP particles within the silicone matrix and enhances interfacial interactions. This results in a significant increase in the magnetorheological (MR) effect, with anisotropic MREs based on dual-modified CIP achieving an MR effect of 246.8%. Additionally, the modified MREs exhibit reduced elastic modulus and enhanced elongation, making them more suitable for soft actuator applications. The dual-modified CIP also prevents hydrolysis of Fe-O-Si-C bonds, improving the long-term stability of the MREs.
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