IN A LANDMARK DISCOVERY, FLEET UNIVERSITY OF WOLLONGONG (UOW) RESEARCHERS HAVE Realized THE NON-CONTACT MANIPULATION OF LIQUID METAL. The metals can be controlled to move in any direction, and manipulated into unique, levitated shapes such as loops and squares by using a small voltage and a magnet. The liquid metal used is Galinstan, an alloy of gallium, indium and tin, which favors the formation of droplets due to its high surface tension. Under the application of a small ‘triggering’ voltage, this liquid-metal becomes a wire as the voltage causes electrochemical oxidation which lowers the surface tension of the metal. “Because these reactions require an electrical current passing through the wire, it becomes possible to apply a force to the wire via application of a magnetic field (ie, electromagnetic induction; the same mechanism as drives motion in an electric motor). Thus, the wires can be manipulated to move in a controllable path, and can even be suspended (against gravity) arou...
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