NDLI: Magnetic-field-induced liquid metal droplet manipulation

Content Provider	Springer Nature Link
Author	Kim, Daeyoung Lee, Jeong Bong
Copyright Year	2015
Abstract	We report magnetic-field-induced liquid metal droplet on-demand manipulation by coating a liquid metal with ferromagnetic materials. The gallium-based liquid metal alloy has a challenging drawback that it is instantly oxidized in ambient air, resulting in surface wetting on most surfaces. When the oxidized surface of the droplet is coated with ferromagnetic materials, it is non-wettable and can be controlled by applying an external magnetic field. We coated the surface of a liquid metal droplet with either an electroplated CoNiMnP layer or an iron (Fe) particle by simply rolling the liquid metal droplet on an Fe particle bed. For a paper towel, the minimum required magnetic flux density to initiate movement of the ~8 μL Fe-particle-coated liquid metal droplet was 50 gauss. Magnetic-field-induced liquid metal droplet manipulation was investigated under both horizontal and vertical magnetic fields. Compared to the CoNiMnP-electroplated liquid metal droplet, the Fe-particle-coated droplet could be well controlled because Fe particles were uniformly coated on the surface of the droplet. With a maximum applied magnetic flux density of ~1,600 gauss, the CoNiMnP layer on the liquid metal broke down, resulting in fragmentation of three smaller droplets, and the Fe particle was detached from the liquid metal surface and was re-coated after the magnetic field had been removed.
Starting Page	282
Ending Page	286
Page Count	5
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	66
Issue Number	2
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2015-02-01
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Liquid metal droplet Manipulation CoNiMnP electroplating Theoretical, Mathematical and Computational Physics Fe particle coating Magnetic field Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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