Curved and flexible STA. (IMAGE)
Caption
a, A smooth spheroidal piece of steel can be covered by thick pillars after wire cutting. Inserting a membrane in the pillars provides a curved STA. Scale bar, 1 cm. b, STA can also be made on thin films of steel, which makes it flexible. The films can be welded onto flat or cylindrical solids. Scale bar, 1 cm. c, The cooling efficiency of these armoured materials (either cubic or cylindrical) is tested by exposing them to a water jet with a rate of 20 ml min–1. Although the temperature T of a bare solid is hardly affected (black data), armours provide rapid and efficient cooling, as evidenced by the drop in temperature (red data) and by the colour change of the samples.
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