Jamie Condliffe reporting – Self-Healing Circuits Use Liquid Metal To Turn Electronics Into Superheroes:
[Researchers have] developed a way to create printed circuits that can heal themselves using liquid metal. The best bit is that, unlike X-Men, this is real.
So how the hell does it work? Essentially, the scientists have created tiny micro-capsules that contain liquid metal. When a printed circuit is made, a thin layer of these capsules can also be printed on top of the conventional strip of metal.
If a small crack forms in the printed circuit, usually that crack breaks the circuit. But with the micro-capsules in place, as the crack propagates some of the capsules are wrenched open, in turn releasing a small amount of liquid metal. That metal is enough to bridge the gap and keep the circuit working.