Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X42: Structured Materials
11:15 AM–2:15 PM,
Friday, March 6, 2020
Room: 709/711
Sponsoring
Unit:
GMAG
Chair: Amal El-Ghazaly, Cornell
Abstract: X42.00011 : Ferromagnetic Liquid Droplets
Presenter:
Xubo Liu
(Beijing Advanced Innovation Center for Soft Matter Science)
Author:
Xubo Liu
(Beijing Advanced Innovation Center for Soft Matter Science)
nanoparticles in carrier fluids and are paramagnetic liquids that become magnetized in
the presence of an external magnetic field but completely lose the magnetization at
remanence when the field is removed. We have found a route to reversibly transform
these paramagnetic droplets into ferromagnetic droplets by the formation, assembly
and jamming of a magnetic nanoparticle-surfactants at the interface of the droplet
with a surrounding immiscible fluid that encapsulates the magnetic nanoparticle
dispersion. These liquid droplets have a coercivity and remanent magnetization at
room temperature. They couple features of liquids, including versatile and reversible
control of shape, and translational and rotational degrees of freedom, but preserve a
magnetic moment, enabling remote manipulation by an external magnetic field. The
droplets were shaped into cylinders, made buoyant in the surrounding liquid, and, in
response to a rotating permanent magnet, rotated at an increasing angular velocity that
reached a size-dependent maximum velocity. Assemblies of multiple liquid magnets
form switchable, dynamic self-organized patterns, similar to those of Mayer’s floating
magnets. The ability to shape and manipulate the ferromagnetic liquid droplets opens
possibilities for magnetically actuated sensors, all-liquid magnetic storage medium
and magnetically driven 3D-printed robotic systems. These findings represent a new
concept where soft matter, nanotechnology and magnetism meet, establishing a
platform for a new generation of all-liquid devices. In collaboration with N. Kent, A.
Ceballos, R. Streubel, Y. Jiang, Y. Chai, J. Forth, S. Shi, D.Wang, B. A. Helms, P. D.
Ashby, P. Fischer and T. P. Russell.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2023 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
1 Research Road, Ridge, NY 11961-2701
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700