A system that can reconfigure its thermal appearance to blend in with varying temperatures. It contains a top electrode with layers of graphene and a bottom electrode made of a gold coating on heat-resistant nylon. Sandwiched between the electrodes is a membrane soaked with an ionic liquid, which contains positively and negatively charged ions. When a small voltage is applied, the ions travel into the graphene, reducing the emission of infrared radiation from the camo's surface. The system is thin, light and easy to bend around objects. The team showed that they could thermally camouflage a person's hand. They also could make the device thermally indistinguishable from its surroundings, in both warmer and cooler environments. [Source]