Monday 23 September 2019
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business-standard - 12 days ago

Chameleon inspired new smart skin changes colour in heat, sun

Scientists have developed a flexible smart skin that changes colour when it reacts to heat and sunlight while maintaining a near-constant volume.The study was published in the journal ACS Nano . Watching a chameleon change colours gave me the idea for the breakthrough, said first author Yixiao Dong. We ve developed a new concept for a colour-changing smart skin, based on observations of how nature does it. Besides chameleons, many other creatures have evolved the ability to change colour. The stripes on a neon tetra fish, for example, turn from deep indigo to blue-green when they swim into the sunlight.The colouration in these organisms is not based on pigments, but on tiny particles in a repeating pattern, known as photonic crystals.To mimic chameleons and create artificial smart skin, scientists have experimented with embedding photonic crystal arrays into flexible, water-containing polymers, or hydrogels.Expanding or contracting the hydrogel changes the spacing between the ...

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