Reconfigurable ferromagnetic liquid droplets

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

28 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)264-267
Journal / PublicationScience
Volume365
Issue number6450
Publication statusPublished - 19 Jul 2019
Externally publishedYes

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.

Citation Format(s)

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.

In: Science, Vol. 365, No. 6450, 19.07.2019, p. 264-267.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal