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A graphene mouthguard | Hackaday

We are all intimate with facial coatings to slow down the spread of coronavirus. Some can be recycled and others become waste after one use. [Dr. Ye Ruquan] and a team of researchers from City University in Hong Kong, CityU, are developing an inexpensive recyclable mask with excellent antibacterial properties, and get it, the graphene it contains will generate a small current when moistened with human breath. There is not enough power to charge your phone or anything, but the voltage drops when the masks get dirty, so it can help decide when to clean it. The video after the break shows the voltage test and it reminds us of these batteries.

All the remarkable qualities of this mask come from laser-induced graphene. The laboratory produces LIG by lasing polyimide films with a commercial CO2-infrared model. In a speed test, the process can convert 1

00 cm² in ninety seconds, so the masks can be made cheaper than an N95 version with the meltblown layer that is not so good for the ground. Testing of the antibacterial properties against activated carbon fiber and blown masks showed that approx. 80% of the bacteria are inactive after 8 hours compared to the others in the single digits. If you put them in the sun for 10 minutes, blown fabric goes to over 85%, but the graph is 99.998%, which means that a bacterium in 50K survives. The exact mechanism is not known, however [Dr. Ye] believes it may have something to do with the sharp edges and hydrophobic quality of the graph. A few coronavirus species were also affected and the species causing COVID-19 are being tested this year.

An overly moist mask is nothing to sneeze at, so keep yourself in check and stay great.

Thanks for the tip, [Qes].

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