Flexible and Printed Electronics, Volume 9, Number 1, 2024 DOI: doi.org/10.1088/2058-8585/ad2dae

Flexible and Twistable Free-standing PDMS-magnetic-nanoparticle-based Soft Magnetic Films with Robust Magnetic Properties


Swarup Kumar Subudhi1, Beihan Zhao1, Xinjun Wang2, John Ting3, Ichiro Takeuchi2, Abhijit Dasgupta1, and Siddhartha Das1,*
1 Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, United States of America
2 Department of Material Science and Engineering, University of Maryland, College Park, MD 20742, United States of America
3 Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, United States of America
* Author to whom any correspondence should be addressed.

For more information about this article and related research, please contact Prof. Siddhartha Das

Abstract:

In this paper, we develop multifunctional, physically soft, mechanically compliant, and magnetically responsive PDMS films, with embedded Fe3O4 nanoparticles, that show robust magnetic properties over a significant range of mechanical deformation. First, we establish that the magnetic properties, namely the saturation magnetization (Ms), remanent magnetization (Mr), and intrinsic coercivity (Hci) of these PDMS films in highly deformed configurations, i.e. in folded, twisted (with different twist angles), and bent (flexed) configurations, show very little degradation compared to those obtained in undeformed configurations. Next, the films were subjected to repetitive cycles of zero-to-max deformation (R = 0) and the saturation magnetization of the films was shown to not exhibit any significant degree of progressive degradation as a function of cyclic deformation history. These findings confirm the excellent robustness and cyclic durability of magnetic properties shown by these magnetic and compliant PDMS films and point to their suitability for wearable electronics applications.

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