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Soft Viscoelastic Magnetic Hydrogels from the In Situ Mineralization of Iron Oxide in Metal-Coordinate Polymer Networks

Author(s)
Song, Jake; Kim, Sungjin; Saouaf, Olivia; Owens, Crystal; McKinley, Gareth H.; Holten-Andersen, Niels; ... Show more Show less
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Abstract
The design of soft magnetic hydrogels with high concentrations of magnetic particles is complicated by weak retention of the iron oxide particles in the hydrogel scaffold. Here, we propose a design strategy that circumvents this problem through the in situ mineralization of iron oxide nanoparticles within polymer hydrogels functionalized with strongly iron-coordinating nitrocatechol groups. The mineralization process facilitates the synthesis of a high concentration of large iron oxide nanoparticles (up to 57 wt % dry mass per single cycle) in a simple one-step process under ambient conditions. The resulting hydrogels are soft (kPa range) and viscoelastic and exhibit strong magnetic actuation. This strategy offers a pathway for the energy-efficient design of soft, mechanically robust, and magneto-responsive hydrogels for biomedical applications.
Date issued
2023-11-02
URI
https://hdl.handle.net/1721.1/153977
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society
Citation
ACS Appl. Mater. Interfaces 2023, 15, 45, 52874–52882.
Version: Final published version
ISSN
1944-8244
1944-8252
Keywords
General Materials Science

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