Reconfigurable ferromagnetic liquid droplets
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 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.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1543067
- Alternate Identifier(s):
- OSTI ID: 1592413
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Science
- Additional Journal Information:
- Journal Name: Science Journal Volume: 365 Journal Issue: 6450; Journal ID: ISSN 0036-8075
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
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, and Russell, Thomas P.. Reconfigurable ferromagnetic liquid droplets. United States: N. p., 2019.
Web. doi:10.1126/science.aaw8719.
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.. Reconfigurable ferromagnetic liquid droplets. United States. https://doi.org/10.1126/science.aaw8719
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, and Russell, Thomas P.. Thu .
"Reconfigurable ferromagnetic liquid droplets". United States. https://doi.org/10.1126/science.aaw8719.
@article{osti_1543067,
title = {Reconfigurable ferromagnetic liquid droplets},
author = {Liu, Xubo and Kent, Noah and Ceballos, Alejandro and Streubel, Robert and Jiang, Yufeng and Chai, Yu and Kim, Paul Y. and Forth, Joe and Hellman, Frances and Shi, Shaowei and Wang, Dong and Helms, Brett A. and Ashby, Paul D. and Fischer, Peter and Russell, Thomas P.},
abstractNote = {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.},
doi = {10.1126/science.aaw8719},
journal = {Science},
number = 6450,
volume = 365,
place = {United States},
year = {2019},
month = {7}
}
https://doi.org/10.1126/science.aaw8719
Web of Science
Figures / Tables:

Works referenced in this record:
Guiding kinetic trajectories between jammed and unjammed states in 2D colloidal nanocrystal-polymer assemblies with zwitterionic ligands
journal, August 2018
- Zhang, Ziyi; Jiang, Yufeng; Huang, Caili
- Science Advances, Vol. 4, Issue 8
Field Induced Formation of Mesoscopic Polymer Chains from Functional Ferromagnetic Colloids
journal, May 2007
- Benkoski, Jason J.; Bowles, Steven E.; Korth, Bryan D.
- Journal of the American Chemical Society, Vol. 129, Issue 19
Dynamic self-assembly of magnetized, millimetre-sized objects rotating at a liquid–air interface
journal, June 2000
- Grzybowski, Bartosz A.; Stone, Howard A.; Whitesides, George M.
- Nature, Vol. 405, Issue 6790
A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys
journal, May 1948
- Stoner, E. C.; Wohlfarth, E. P.
- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 240, Issue 826
Spatial and Temporal Correlations of XY Macro Spins
journal, September 2018
- Streubel, Robert; Kent, Noah; Dhuey, Scott
- Nano Letters, Vol. 18, Issue 12
A Photographic Study of Mayer's Floating Magnets
journal, January 1909
- Derr, Louis
- Proceedings of the American Academy of Arts and Sciences, Vol. 44, Issue 19
Static and dynamic magnetic properties of spherical magnetite nanoparticles
journal, September 2003
- Goya, G. F.; Berquó, T. S.; Fonseca, F. C.
- Journal of Applied Physics, Vol. 94, Issue 5
Reconfigurable Printed Liquids
journal, March 2018
- Forth, Joe; Liu, Xubo; Hasnain, Jaffar
- Advanced Materials, Vol. 30, Issue 16
Reconfigurable Microfluidic Droplets Stabilized by Nanoparticle Surfactants
journal, February 2018
- Toor, Anju; Lamb, Sean; Helms, Brett A.
- ACS Nano, Vol. 12, Issue 3
Magnetic Nanoparticles: Synthesis, Protection, Functionalization, and Application
journal, February 2007
- Lu, An-Hui; Salabas, E. L.; Schüth, Ferdi
- Angewandte Chemie International Edition, Vol. 46, Issue 8
Liquid Tubule Formation and Stabilization Using Cellulose Nanocrystal Surfactants
journal, September 2017
- Liu, Xubo; Shi, Shaowei; Li, Yanan
- Angewandte Chemie International Edition, Vol. 56, Issue 41
Liquid Letters
journal, January 2018
- Shi, Shaowei; Liu, Xubo; Li, Yanan
- Advanced Materials, Vol. 30, Issue 9
Shape and Buckling Transitions in Solid-Stabilized Drops †
journal, October 2005
- Xu, Hui; Melle, Sonia; Golemanov, Konstantin
- Langmuir, Vol. 21, Issue 22
Switchable Static and Dynamic Self-Assembly of Magnetic Droplets on Superhydrophobic Surfaces
journal, July 2013
- Timonen, J. V. I.; Latikka, M.; Leibler, L.
- Science, Vol. 341, Issue 6143
Mechanical and Microscopic Properties of the Reversible Plastic Regime in a 2D Jammed Material
journal, January 2014
- Keim, Nathan C.; Arratia, Paulo E.
- Physical Review Letters, Vol. 112, Issue 2
Ferrofluids and their applications
journal, November 2013
- Odenbach, Stefan
- MRS Bulletin, Vol. 38, Issue 11
Dynamic and programmable self-assembly of micro-rafts at the air-water interface
journal, May 2017
- Wang, Wendong; Giltinan, Joshua; Zakharchenko, Svetlana
- Science Advances, Vol. 3, Issue 5
Stabilizing Liquid Drops in Nonequilibrium Shapes by the Interfacial Jamming of Nanoparticles
journal, October 2013
- Cui, M.; Emrick, T.; Russell, T. P.
- Science, Vol. 342, Issue 6157, p. 460-463
Dipole interactions with random anisotropy in a frozen ferrofluid
journal, November 1991
- Luo, Weili; Nagel, Sidney R.; Rosenbaum, T. F.
- Physical Review Letters, Vol. 67, Issue 19
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