Magnetic slime 'robot' could help recover swallowed objects

Soft robots may soon be more flexible. Researchers have developed a robot that can shift into different shapes to grab objects. It can encircle a group of pellets and even stretch out in multiple directions to grab items on opposite sides. It is self-healing as well. The result might cause some nightmares for the squeamish, but it is surprisingly effective.

The blend of alcohol, borax and magnets is what makes the slime. A non-Newtonian fluid that behaves like a liquid or solid can be controlled using external magnets. The ultimate goal is to use it like a robot, according to researcher and co- creator Li Zhang.

There are many problems that need to be solved. The scientists want to prevent the toxic neodymium particles from coming out of the soft design. Safety inside a living being might depend on limiting contact, but a layer ofsilica in this current slime helps. If the technology becomes safe and effective, it could help doctors recover swallowed objects and squeeze robots into places that were previously impractical.