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3-D structures built out of liquid metal

Date:
July 9, 2013
Source:
North Carolina State University
Summary:
Researchers have developed three-dimensional printing technology and techniques to create free-standing structures made of liquid metal at room temperature.

Researchers have developed three-dimensional structures out of liquid metal.
Credit: Michael Dickey

Researchers from North Carolina State University have developed three-dimensional (3-D) printing technology and techniques to create free-standing structures made of liquid metal at room temperature.

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"It's difficult to create structures out of liquids, because liquids want to bead up. But we've found that a liquid metal alloy of gallium and indium reacts to the oxygen in the air at room temperature to form a 'skin' that allows the liquid metal structures to retain their shapes," says Dr. Michael Dickey, an assistant professor of chemical and biomolecular engineering at NC State and co-author of a paper describing the work.

The researchers developed multiple techniques for creating these structures, which can be used to connect electronic components in three dimensions. White it is relatively straightforward to pattern the metal "in plane" -- meaning all on the same level -- these liquid metal structures can also form shapes that reach up or down.

One technique involves stacking droplets of liquid metal on top of each other, much like a stack of oranges at the supermarket. The droplets adhere to one another, but retain their shape -- they do not merge into a single, larger droplet.

Another technique injects liquid metal into a polymer template, so that the metal takes on a specific shape. The template is then dissolved, leaving the bare, liquid metal in the desired shape. The researchers also developed techniques for creating liquid metal wires, which retain their shape even when held perpendicular to the substrate.

Dickey's team is currently exploring how to further develop these techniques, as well as how to use them in various electronics applications and in conjunction with established 3-D printing technologies.

"I'd also like to note that the work by an undergraduate, Collin Ladd, was indispensable to this project," Dickey says. "He helped develop the concept, and literally created some of this technology out of spare parts he found himself."

The paper, "3-D Printing of Free Standing Liquid Metal Microstructures," is published online in Advanced Materials. Ladd, a recent NC State graduate, is lead author. Co-authors are Dickey; former NC State Ph.D. student Dr. Ju-Hee So; and Dr. John Muth, a professor of electrical and computer engineering at NC State.

The work was supported by a National Science Foundation CAREER award and the National Science Foundation's ASSIST Engineering Research Center at NC State.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Collin Ladd, Ju-Hee So, John Muth, Michael D. Dickey. 3D Printing of Free Standing Liquid Metal Microstructures. Advanced Materials, 2013; DOI: 10.1002/adma.201301400

Cite This Page:

North Carolina State University. "3-D structures built out of liquid metal." ScienceDaily. ScienceDaily, 9 July 2013. <www.sciencedaily.com/releases/2013/07/130709115353.htm>.
North Carolina State University. (2013, July 9). 3-D structures built out of liquid metal. ScienceDaily. Retrieved March 6, 2015 from www.sciencedaily.com/releases/2013/07/130709115353.htm
North Carolina State University. "3-D structures built out of liquid metal." ScienceDaily. www.sciencedaily.com/releases/2013/07/130709115353.htm (accessed March 6, 2015).

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