Scientists have manufactured a microscale bicycle chain comprised of silicon links thinner than a human hair that behaves just like its regular-sized counterpart. The tiny chain system could one day help power microscopic devices.
Image: Courtesy of Barry Ritchey/Sandia National Laboratories
Ed Vernon, a technologist at Sandia National Laboratories, designed and patented the 50-link silicon microchain (see image), which was built by the labs Microelectronics Development Laboratory (MDL). The centers of the tiny links are separated by just 50 microns. The links can rotate 52 degrees in either direction with respect to their counterparts in the chain without breaking the support structure. Such flexibility, the scientists note, means multiple gears powered by the chain need not lie in a straight line.
Such a gear and chain mechanism could conceivably replace the multiple drivers currently required to run microelectromechanical systems (MEMS) motors. "All those drives take up a lot of real estate on chips," Vernon notes. A single chain, however, could rotate many drive shafts or drive a MEMS device from a motor situated at a distance. But MEMS researcher Kaigham Gabriel of Carnegie Mellon University observes that "there are very few applications in the commercial space that require continuous rotary motion or the translation thereof." He also cautions that microscopic gears tend to lock together less tightly than do macroscopic ones. One thing is for certain, any applications that do come of the new work are a long way off. Says Vernon: "I expect it will be three to four years before youll see anything this complex out in industry."
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