Nanotechnologists promise a lot: electronics forged from individual molecules, superstrong, lightweight materials, ultrafine capsules that carry drugs to specific organs or cells in the body. But to tinker with materials on that scale, researchers need tools to probe and nudge their invisibly small specimens. And manufacturers will need equipment to mass-produce these future marvels. Such instruments don't come cheap. The going price for a nano-manipulator—a machine so named not because it is tiny itself but because it can move things around with nanometer precision—is tens of thousands of dollars. MIT mechanical-engineering professor and TR100 honoree Martin Culpepper believes he can produce better instruments for less than $3,000 apiece using a different approach to machine design. Existing nanoma-nipulators, he points out, "have got a bunch of different joints and linkages to assemble together." Because the gaps between pieces can be many nanometers wide, this "old paradigm," as he calls it, is impractical for nanoscale motion. Instead, Culpepper's machine is built around one piece that bends and flexes ever so slightly. He shows TR's Dan Cho how to provide supersmall movement without an astronomical price tag.
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