Scientists have developed what they claim is the world’s lightest material — a metal with a density of 0.9 mg/cc.
A team from the University of California, the California Institute of Technology and HRL Laboratories says that the new material redefines the limits of lightweight materials because of its unique “micro-lattice” cellular architecture. The scientists were able to make a material that consists of 99.99 per cent air by designing the 0.01 per cent solid at the nanometre, micron and millimetre scales, the latest issue of the Science journal reported.
“The trick is to fabricate a lattice of interconnected hollow tubes with a wall thickness 1,000 times thinner than a human hair,” said lead scientist Tobias Schaedler of HRL.
The material’s architecture allows unprecedented mechanical behaviour for a metal, including complete recovery from compression exceeding 50 per cent strain and high energy absorption. Developed for the Defence Advanced Research Projects Agency, the novel material could be used for battery electrodes and acoustic, vibration or shock energy absorption, say the scientists.