Needless to say, there aren’t many places you'd want to wear a tiny, super-heated thermal camouflage jacket that has to stay immersed in water, but the experiment demonstrates the potential for such materials. This caused light to bend away from the carbon nanotube sheet, effectively cloaking anything behind it with invisibility. In the experiment, the researchers heated the sheets electrically, which transferred the heat to the surrounding area (a petri dish of water). These sheets are also excellent conductors of heat, making them ideal mirage-makers. Each page is barely as thick as a single molecule, yet is as strong as steel because the carbon atoms in each tube are bonded incredibly tightly. They used sheets of carbon nanotubes, sheets of carbon wrapped up into cylindrical tubes. In 2011, researchers at the University of Texas at Dallas NanoTech Institute managed to capitalize on this effect. You've probably seen similar effects on hot roadway surfaces, with distant stretches of the road appearing to gleam with pooled water. In the classic example of the desert mirage, this effect causes a "puddle" of sky to appear on the ground, which the logical (and thirsty) brain interprets as a pool of water. The refraction swings the light rays up toward the viewer’s eyes instead of bouncing them off the surface. The hot sand is key to the mirage effect (or photothermal deflection), as the stiff temperature difference between sand and air bends, or refracts, light rays.
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