shape memory alloy (SMA) - metal alloys that can remember their shape when heated, hydrochromic paint - changing colour after contact with water or moisture, polymorph - a thermoplastic material that can be shaped and reshaped any number of times. It is normally supplied as granules that look like small plastic beads. It can be heated in hot water and when it reaches 62 degrees centigrade the granules form a mass of 'clear' material., thermochromic pigment - change colour at specific temperatures. Examples include colour-changing novelty mugs, colour-changing spoons, battery power indicators and forehead thermometers, QTC - a material made from particles of a metal (nickel) embedded in a polymer. Its resistance changes dramatically when it is compressed. Uncompressed, it is an almost perfect electrical insulator. When a force is applied, it conducts as well as a metal., photochromic pigment - change colour when exposed to light. This can be used in clothing but is most commonly found in photochromic lenses for glasses, which darken when exposed to ultraviolet light, self healing material - smart materials that, after suffering damage, damage, cut or fracture, can return to their original state causing their own repair,

Smart materials

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