Generating electricity from the movements of molecules in a fluid could one day power devices like tiny medical implants or household appliances
A miniature generator can convert the movements of molecules in room temperature liquid into electricity. The device could one day be used to power devices like medical implants or even small household appliances.
Molecules are constantly moving, thanks to the thermal energy they possess at temperatures above absolute zero, even if they appear still to the human eye. For example, at room temperature, the atoms in a glass of water are always jostling around. “We thought it would be interesting and meaningful to see if this motion can be harvested and converted into electricity,” saysSo, Li and his colleagues created an energy-harvesting device just 1-centimetre square, which consists of a top and bottom electrode with several 25-nanometre-wide strands of zinc oxide attached to each. The material was chosen for its ability to generate electrical charge under mechanical deformation.
The researchers hope the device could be used to supply energy for nanotechnologies, such as tiny implants for drug delivery. They also want to scale up the technology to be able to power larger things.“ that the mechanical energy arising from the thermal motion of the n-octane liquid molecules could be converted into constant electrical power at room temperature without the need of any other energy source,” saysat the University of Porto in Portugal.
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