Issue Date: August 7, 2017
Magnetic fields cause microcubes to respond like mini robots
Hours of practice enable marching band members to smoothly step through one orderly formation after another. Some colloidal particles can also do that fancy footwork, but they don’t need to practice. A team of researchers including Koohee Han and Orlin D. Velev of North Carolina State University made polymer cubes with 10-µm-long edges and selectively coated one face of each cube with a 100-nm-thick film of cobalt, which can be magnetized. . . .
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