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On the 16th, a bioengineering paper published in the UK's "Nature and Communications" magazine reported on the world's first "vapor drive engine." It can accomplish some common tasks, such as providing driving force and generating electricity. In the researchers' demonstration, such engines can drive mini-cars or light-emitting diodes (LEDs). The results show that the water in our most common natural environment actually has the potential to be tapped and can provide humans with useful energy.
The phase transition of matter from liquid to gas is evaporation, which is a very common phenomenon and the main form of energy transfer in the earth's climate. A man-made evaporation device is quite simple, but in the engineering system, evaporation is rarely used as a source of energy.
This time, Ozul Sahin, a scientist at Columbia University in the United States, and his research team invented a kind of “humidity-driven artificial muscle†because its initials are also called HYDRAs. It starts by attaching bacterial spores to a 8 micron thick polyimide tape. In bacterial spores, water is confined to the nanoscale cavity, and humidity can produce large pressure changes. In wet and dry conditions, the tape can change its curvature. When many tapes are assembled in parallel, they can lift heavy objects against gravity.
Next, the researchers used these HYDRAs materials to create a "steam-driven engine" that can do rotary motion and piston motion. When placed in a water-air interface, they can be automatically started and run. As a result, the team designed generators placed on the surface of the water to light the LED lamps with the collected evaporation energy; they also designed a mini-car with a weight of 0.1 kilograms that would evaporate when the water in the car evaporated. Drive the car forward.
The researchers said that the "evaporative drive engine" may be used to drive robotic systems, sensors, and other devices in the future, and even to work in a natural environment. (Reporter Zhang Mengran)
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