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Flytrap Machine

The Venus flytrap is a plant, but it acts like a cross between an animal and a machine. When an unsuspecting fly lands on a flytrap's leaf, the plant snaps shut, imprisoning the insect. Inspired by the plant's quick reflexes, researchers have designed a material that acts in a similar way. The material might someday have a number of uses, including delivering medications to just the right spot in the body. There are no muscles in a flytrap's leaf. Instead, the plant's cells snap mechanically. To mimic the snapping process, scientists from the University of Massachusetts, Amherst, attached two very thin layers of flexible material to each other. Each layer was just 1.5 millimeters (0.06 inch) thick. Both layers contained circular indentations, like craters. When the layers were bonded, the borders of the indentations matched up, creating internal pockets. Using chemical signals or physical pressure, the scientists were able to change the material's shape in just tens of milliseconds. (There are 1,000 milliseconds in 1 second). Like the flytrap's cells, the material's pockets could flip inside out and back. Similar materials could do the same thing in response to heat, light, or electricity, the researchers say. But what's important is that the snapping happens automatically. There's no need to apply extra energy. "There are very, very large changes in shape and geometry with a very, very small amount of pressure," says researcher Alfred Crosby. "So it's extremely sensitive." What's the point? It turns out that flytraplike materials could be useful in our lives. For example, snapping surfaces in food packaging could work as sensors that react when food is spoiling or storage temperatures are too high. Small devices made from these surfaces could transport medicines through the body. The material would snap open when the device arrived at the right place. "Learning from nature can actually teach us how to come up with something more functional," says Hongrui Jiang of the University of Wisconsin–Madison.—Emily Sohn

Flytrap Machine
Flytrap Machine

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