Scientists have developed a new
light weight, conductive material which can convert body heat into electricity,
and lead to t-shirts or arm bands that generate power for wearable electronics.
The prototypes, developed by researchers at North Carolina State University in
the US, are lightweight, conform to the shape of the body, and can generate far
more electricity than previous lightweight heat harvesting technologies. The researchers
also identified the optimal site on the body for heat harvesting. Wearable thermoelectric
generators (TEGs) generate electricity by making use of the temperature
differential between your body and the ambient air.
Previous approaches either made use
of heat sinks – which are heavy, stiff and bulky – or were able to generate
power only one microwatt or less of per square centimeter. This technology generates
up to 20 microwatt per square centimeter and doesn’t use a heat sink, making it
lighter and much more comfortable. The new design begins with a layer of
thermally conductive material that rests on the skin and spreads out the heat. The
material is topped with a polymer layer that prevents the heat from dissipating
through to the outside air.
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