Reconfigurable ferromagnetic liquid droplets

Liu, Xubo; Kent, Noah; Ceballos, Alejandro; Streubel, Robert; Jiang, Yufeng; Chai, Yu; Kim, Paul Y.; Forth, Joe; Hellman, Frances; Shi, Shaowei; Wang, Dong; Helms, Brett A.; Ashby, Paul D.; Fischer, Peter; Russell, Thomas P.

doi:10.1126/science.aaw8719

Title: Reconfigurable ferromagnetic liquid droplets

Journal Article · 19 July 2019 · Science

DOI: https://doi.org/10.1126/science.aaw8719 · OSTI ID:1543067

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Beijing Univ. of Chemical Technology, Beijing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Beijing Univ. of Chemical Technology, Beijing (China)
Beijing Univ. of Chemical Technology, Beijing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Massachusetts, Amherst, MA (United States); Tohuko Univ., Sendai (Japan)

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 the magnetic properties of solid ferromagnets with classic north-south dipole interactions. Finally, 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1543067

Alternate ID(s):: OSTI ID: 1592413

Journal Information:: Science, Vol. 365, Issue 6450; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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