Zapping liquid metal droplets with ultrasound offers a new way to make wiring for stretchy, bendy electronics.
The technique, described in the Nov. 11 Science, adds a new approach to the toolbox for researchers developing circuitry for medical sensors that attach to the skin, wearable electronics and other applications where rigid circuit electronics are less than ideal (SN: 6/1/18).
The researchers began by drawing on sheets of stretchy plastic with lines of microscopic droplets made of an alloy of gallium and indium. The metal alloy is liquid at temperatures above about 16° Celsius.
Though the liquid metal is electrically conductive, the droplets quickly oxidize. That process covers each of
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