Researchers at Johns Hopkins University have developed 700â¿¿micrometer metallic grippers that can be remotely triggered to clench. The microgrippers, which can be maneuvered into place using magnets, could be useful for removing cells for biopsy or other medical applications. Inspired by the joints of crabs, the scientists built their microgrippers using a layer of prestressed metal that is held open by segments of organic polymer. Increasing the temperature or adding certain chemicals softens the polymer and releases the tension in the metal.
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