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'Terminator'-like liquid metal moves and stretches in 3D space

Date:
March 20, 2019
Source:
American Chemical Society
Summary:
In the blockbuster 'Terminator' movie franchise, an evil robot morphs into different human forms and objects and oozes through narrow openings, thanks to its 'liquid-metal' composition. Although current robots don't have these capabilities, the technology is getting closer with the development of new liquid metals that can be manipulated in 3D space with magnets.
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In the blockbuster Terminator movie franchise, an evil robot morphs into different human forms and objects and oozes through narrow openings, thanks to its "liquid-metal" composition. Although current robots don't have these capabilities, the technology is getting closer with the development of new liquid metals that can be manipulated in 3D space with magnets. Reported in ACS Applied Materials & Interfaces, the materials could someday find applications in soft robotics. Watch them in action here.

Metals that are liquids at room temperature, such as gallium and certain alloys, have unique properties including high conductivity, low melting point and high deformability. These properties make them attractive for use in soft robots and flexible electronics. By adding magnetic particles, such as nickel or iron, researchers can produce liquid metals that they can manipulate with magnets. However, because of their high surface tension, most magnetic liquid metals can only move horizontally, and they must be immersed completely in liquid to avoid forming a paste. Liang Hu, Jing Liu and colleagues wanted to make a magnetic liquid metal that they could move and stretch both horizontally and vertically, without needing to put the material completely in a liquid.

To do so, the researchers first worked with the material submersed in liquid. They added iron particles to a droplet of a gallium, indium and tin alloy immersed in hydrochloric acid. A gallium oxide layer formed on the droplet surface, which lowered the surface tension of the liquid metal. When the team applied two magnets in opposite directions, they could stretch the droplet to almost four times its resting length. They could also manipulate the liquid metal to connect two immersed, horizontal electrodes and, by virtue of its conductive properties, light up an LED bulb. The liquid metal could even stretch vertically and then move horizontally to connect two electrodes -- the upper one exposed to air, and the lower one in the hydrochloric acid. This demonstrated that the material didn't have to be fully immersed in liquid. In this way, the magnetic liquid metal was reminiscent of an upright walking amphibian, the researchers say.

These authors acknowledge funding from the 111 Project and the National Natural Science Foundation of China.


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Materials provided by American Chemical Society. Note: Content may be edited for style and length.


Journal Reference:

  1. Liang Hu, Hongzhang Wang, Xiaofei Wang, Xiao Liu, Jiarui Guo, Jing Liu. Magnetic Liquid Metals Manipulated in the Three-Dimensional Free Space. ACS Applied Materials & Interfaces, 2019; 11 (8): 8685 DOI: 10.1021/acsami.8b22699

Cite This Page:

American Chemical Society. "'Terminator'-like liquid metal moves and stretches in 3D space." ScienceDaily. ScienceDaily, 20 March 2019. <www.sciencedaily.com/releases/2019/03/190320102206.htm>.
American Chemical Society. (2019, March 20). 'Terminator'-like liquid metal moves and stretches in 3D space. ScienceDaily. Retrieved May 23, 2024 from www.sciencedaily.com/releases/2019/03/190320102206.htm
American Chemical Society. "'Terminator'-like liquid metal moves and stretches in 3D space." ScienceDaily. www.sciencedaily.com/releases/2019/03/190320102206.htm (accessed May 23, 2024).

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