Scientists use carbon nanotubes to make the world's smallest electric motor. It has a diameter of about 500 nanometers, 300 times smaller than the hairline, and can be rotated by voltage. Nanomotors were designed by scientists at the University of California, Berkeley. The school's Alex Zeitler and other researchers reported in the British magazine Nature published on the 24th that the rotating blades of the motor are a gold leaf, less than 300 nanometers in length, and the blades are mounted on one. The layer of carbon nanotubes is made on the rotating shaft. The multi-walled carbon nanotubes are sleeved by a plurality of hollow circular tubes of different diameters, and the electrodes are made of silicon dioxide at both ends, and are fixed on a silicon wafer, and another three electrodes are arranged around the carbon nanotubes. . Applying a voltage between the carbon nanotubes and one of the electrodes causes it to drive the gold blades to rotate. If the voltage is larger, the outermost layer of the carbon nanotubes will be detached from the inner layer, making the gold blades more flexible. A constant voltage keeps the blade in a fixed position, and a periodic voltage allows it to rotate at a certain speed. Previously, some scientists have developed a variety of tiny nano-motors, but some are larger in size, some require laser or magnetic drive, and the operation is not as flexible and convenient. The nano-motor is easy to drive, flexible in movement, loose in temperature and chemical conditions, and even in vacuum, so it has great application potential, such as using gold blades as mirrors to manipulate light signals, or through blade resonance. The speed of rotation is used to detect chemicals and the like.
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