Your sweaty fingertips could help power the next generation of wearable electronics.
The small beads of sweat your fingertips produce while you sleep could power wearable sensors that measure glucose, vitamin C, or other health indicators. That's the promise of a new advance—a thin, flexible device that wraps around fingertips like a Band-Aid—that its creators say is the most efficient sweat-powered energy harvester yet.
Researchers around the world are currently developing wearable sensors to measure anything from a runner's acceleration to a diabetic's glucose levels. Sweat is a particularly promising energy source because it contains a natural byproduct of anaerobic respiration—the method used by your body to get energy quickly when you exert yourself—called lactate that can be broken down by an enzyme to produce energy. However, existing devices need a lot of sweat to work, and most people don't want to hit the gym whenever their electronics run out of power.
So Yin and his team turned to fingertip sweat. Our fingertips are home to the highest concentration of sweat glands on our body—even higher than in our armpits—and they make sweat constantly, regardless of whether you're exerting yourself. We typically don't notice this sweat because it evaporates almost instantly.. It captures sweat with a flexible hydrogel that sits against the skin. Three foam blocks on top of the gel serve as electrodes.
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