Abstract
An artificial skin made with synthetic melanin nanoparticles would make chameleons green with envy were the lizards capable of such a petty emotion. The synthetic skin changes color faster than a chameleon’s, provided the humidity of the air surrounding the engineered film changes quickly enough (Chem. Mater. 2016, DOI: 10.1021/acs.chemmater.6b02127). Although the skin can switch its hue quicker than chameleons and other color-changers in nature, it was actually inspired by them, say the skin’s developers, led by Ali Dhinojwala of the University of Akron; Nathan C. Gianneschi of the University of California, San Diego; and Matthew D. Shawkey of the University of Ghent. Iridescent bird feathers, such as those found on tree swallows, reversibly change color with changes in humidity. Scientists believe this is a result of the swelling or shrinking of feather fibers as they take on or lose moisture, respectively. The artificial skin works faster but in much
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