Department of Physics and Astronomy: Publications and Other Research
Date of this Version
7-19-2019
Document Type
Article
Citation
Published in Science 365, 264–267 (19 July 2019).
DOI: 10.1126/science.aaw8719
Abstract
Solid ferromagnetic materials are rigid in shape and cannot be reconfigured. Ferrofluids, although reconfigurable, are paramagnetic at room temperature and lose their magnetization when the applied magnetic field is removed. Here, we show a reversible paramagnetic-to-ferromagnetic transformation of ferrofluid droplets by the jamming of a monolayer of magnetic nanoparticles assembled at the water-oil interface. These ferromagnetic liquid droplets exhibit a finite coercivity and remanent magnetization. They can be easily reconfigured into different shapes while preserving themagnetic properties of solid ferromagnets with classic north-south dipole interactions. Their translational and rotational motions can be actuated remotely and precisely by an external magnetic field, inspiring studies on active matter, energy-dissipative assemblies, and programmable liquid constructs.
Includes supplementary text and figures; supplemental movies attached below.
Movie S1
Liu SCIENCE 2019 Reconfigurable -- MOVIE 2.mp4 (2402 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 3.mp4 (1106 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 4.mp4 (1589 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 5.mp4 (3786 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 6.mp4 (3655 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 7.mp4 (2671 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 8.mp4 (4722 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 9.mp4 (2317 kB)
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Liu SCIENCE 2019 Reconfigurable -- MOVIE 10.mp4 (1816 kB)
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Liu SCIENCE 2019 Reconfigurable SUPPLEMENT 1.pdf (992 kB)
Supplemental text, figures, etc.
Included in
Atomic, Molecular and Optical Physics Commons, Condensed Matter Physics Commons, Other Physics Commons
Comments
Copyright © 2019 by the Authors; exclusive licensee American Association for the Advancement of Science. Used by permission.