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Title: Reconfigurable ferromagnetic liquid droplets

Journal Article · · Science
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [6]
  1. Beijing Univ. of Chemical Technology, Beijing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Beijing Univ. of Chemical Technology, Beijing (China)
  6. 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.

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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Nano‐Ferroelectric for High Efficiency Overall Water Splitting under Ultrasonic Vibration journal September 2019
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Reversible modulation of photoenergy in Sm-doped (K 0.5 Na 0.5 )NbO 3 transparent ceramics via photochromic behavior journal January 2019
Recent progress on the fabrication and applications of flexible ferroelectric devices journal January 2020
Highest- T c organic enantiomeric ferroelectrics obtained by F/H substitution journal January 2020
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Investigation of dielectric and piezoelectric properties in aliovalent Eu 3+ ‐modified Pb(Mg 1/3 Nb 2/3 )O 3 ‐PbTiO 3 ceramics journal June 2019
Domain‐scale imaging to dispel the clouds over the thermal depolarization of Bi 0.5 Na 0.5 TiO 3 ‐based relaxor ferroelectrics journal October 2019
Scaling behavior of dynamic hysteresis of PMN‐PT relaxor ferroelectric ceramics near the morphotropic phase boundary journal December 2019
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Figures / Tables (4)


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