Nano-sized device can lift 165 times its own weight

US-based researchers have developed devices thinner than a human hair, which weigh 1.6 milligrams each and can lift 265 milligrams hundreds of times in a row. On applying a small voltage, the 6-cm-long nanosheets made of an inorganic crystalline mineral compound rolled up against gravity. The actuator device works like muscles, converting electrical energy to mechanical energy, said researchers.