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Forced- and Self-Rotation of Magnetic Nanorods Assembly at the Cell Membrane: A Biomagnetic Torsion Pendulum

Forced- and Self-Rotation of Magnetic Nanorods Assembly at the Cell Membrane: A Biomagnetic Torsion Pendulum
François Mazuel, Claire Wilhelm, Myriam Reffay, Jean-Claude Bacri, Riccardo Di Corato, Teresa Pellegrino, Thierry Meylheuc, Samuel Mathieu
In order to provide insight into how anisotropic nano-objects interact with living cell membranes, and possibly self-assemble, magnetic nanorods with an average size of around 100 nm × 1 µm are designed by assembling iron oxide nanocubes within a polymeric matrix under a magnetic field. The nano–bio interface at the cell membrane under the influence of a rotating magnetic field is then explored. A complex structuration of the nanorods intertwined with the membranes is observed. Unexpectedly, after a magnetic rotating stimulation, the resulting macrorods are able to rotate freely for multiple rotations, revealing the creation of a biomagnetic torsion pendulum. Assembling nanorods at the cell membrane by a remote spinning magnetic field leads to a complex biomagnetic macrorod constituted of both nanorods and intertwined cell membrane. This new object behaves as a torsion pendulum able to store elastic energy: it is able to freely rotate over multiple turns in response to the spinning stimulation.

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

DOI: 10.1002/smll.201701274

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