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Doctors dream of the day when they can send micro-machines up our bloodstream to attack cancers and deliver medicines. Scientists can make ever-tinier motors, but they still lack muscle. The design of elephant trunks and octopus legs may hold the secret.
Inside your body, bacteria whip their spiral-like “tails,” or flagella, to zip from place to place. Doctors would love to harness this nanotechnology to send remote-controlled nanobots into human bodies and target diseases such as cancer. But researchers have discovered that they can’t simply miniaturize standard engines.1 In addition to small motors, they have to put some muscle into it—artificial muscle, that is.
According to Revelation 4:11, a choir around God’s throne declares that all honor belongs to Him for His amazing creation. The evidence of His handiwork extends all the way down to bacteria. While doctors still cannot fully copy the locomotor ability of bacteria, researchers have already pumped out some promising designs.
To make a nanobot move, you face two challenges. You need a form of locomotion and a way to energize it. Researchers recently flexed some brainpower to discover a way to do both by taking the bacteria’s flagellum and adding a twist.
Inside the nanobots, the scientists stretched out some “yarn” made of carbon nanotubes, and filled the bot with liquid electrolytes (also found in batteries and sports drinks). Adding an electrical charge causes the yarn to rotate in one direction at up to 600 revolutions per minute. When the charge is reversed, it then rotates the other direction.2 This method of movement is similar to how elephants move their trunks and octopuses work their legs. Long muscle fibers squeeze against a dense core that resists compression. With this design, these animals can move their long, flexible appendages without a solid skeleton.
While this discovery has certainly flexed some creative muscle, models built using this and similar methods aren’t good enough to power full-fledged robots just yet.3 But the future is promising. You could say that these artificial muscles are just getting warmed up. And in the end, the honor will still go to the Creator, who designed both the bacteria and the human brains that can imitate His designs . . . once we work out the kinks.