Advanced Materials
Advanced Materials
5 years ago

Dynamic Self-Assembly of Magnetic/Polymer Composites in Rotating Frames of Reference

Dynamic Self-Assembly of Magnetic/Polymer Composites in Rotating Frames of Reference
Taehoon Lee, Bartosz A. Grzybowski, Konrad Giżynski
Small ferromagnetic particles suspended in a rotating viscous polymer and subjected to an external static magnetic field dynamically self-assemble into open-lattice, periodic structures. Depending on the orientation of the magnetic field with respect to the system's axis of rotation, these structures range from arrays of parallel plates to single, double, triple, or even quaternary helices. Dynamic self-assembly in this rotating frame of reference can be explained by an interplay between magnetic, dipole–dipole, viscous drag, and centripetal forces. Once formed, the dynamic aggregates can be made permanent by thermally curing the polymer matrix. Dynamic self-assembly of magnetic particles in a rotating frame of reference subjected to an external magnetic field produces a range of open-lattice, 3D magnetic structures (arrays of plates, cups, various helices), which can be subsequently solidified in a polymer matrix.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700614

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