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Title: 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. 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:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1543067
Grant/Contract Number:  
AC02-05-CH11231
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:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English

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. 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, and Russell, Thomas P. Thu . "Reconfigurable ferromagnetic liquid droplets". United States. doi: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. 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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aaw8719

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Works referenced in this record:

Stabilizing Liquid Drops in Nonequilibrium Shapes by the Interfacial Jamming of Nanoparticles
journal, October 2013