A ring version of the thermoelectric generator
Xiao Lab
Self-healing and eco-friendly devices that generate electricity from body heat could power wearable gadgets, such as a heart monitor for runners.
Jianliang Xiao at the University of Colorado Boulder and his colleagues created devices based on thermoelectric generators, which convert heat into electricity. They embedded a number of these generators in a thin film made from a flexible polymer called polyimine and wired them together with a liquid gallium-indium alloy to create stretchable bands that can be worn on arms, legs and fingers. It costs less than $10 to produce.
The …
source: newscientist.com