Engineers have developed a generator without moving parts, built into the sole
Engineers from the University of Wisconsin at Madison have developed an electricity generation system that fits in the sole of a boot. In this case, unlike similar projects , the system does not have mechanical moving parts. The electricity generated by walking is suggested to be used to charge gadgets.
Such a charger is well suited for military applications, tourists and residents of remote regions with problems with constant power supply.
According to the calculations of one of the engineers, Tom Krupenkin, the power of the device in one boot can reach 10 W - i.e. a total of 20 watts. According to the scientist, usually this energy is dissipated in the form of heat, while even 10% of this energy is enough to charge a typical smartphone.
The technology works on the principle of “reverse electric wetting” - a process that Krupenkin, together with Ashley Taylor, opened in 2011 precisely in search of converting mechanical energy into electrical energy to collect the energy of human movement.
The device consists of two flat plates between which a conductive fluid circulates. Microscopic holes were made in the bottom plate, and an electrode with insulation was connected to it. Under pressure, gas is formed through the microholes to form bubbles, which then collapse into larger bubbles. This repeating process, which occurs at high speed, moves the fluid along the circuit, which leads to the generation of electric current due to electric wetting .
The power of the experimental setup is 10 W per square meter. Researchers claim that this power can be increased 1000 times. According to them, such a bubble technology shows the largest energy density per unit area among devices for converting mechanical energy into electrical energy.
By integrating such a system into boots, you can accumulate energy in the battery and then charge the device. Or, as the engineers propose, to integrate a WiFi repeater into the sole, which will reduce the energy consumption of the smartphone by reducing the necessary power for signal transmission.