A graphene mouth screen | Hackaday

We are intimate with face coverings to slow the spread of coronovirus. Some are reusable, and some become useless after one use. [Dr. Ye Ruquan] And a research team at City University of Hong Kong, CityU, are developing an inexpensive reusable mask with outstanding antibacterial properties, and, get this, the graphene involved will generate a small current when moistened by human breath. Not enough power to charge your phone or anything, but that voltage drops as the mask becomes dirty, so it can help determine when it needs cleaning. The video after the break shows the voltage test, and it reminds us of those batteries.

All notable properties of this mask come from laser-induced graphene. The laboratory is manufacturing LIG by producing a polyamide film with a commercial CO2 infrared model. In the speed test, the process can change to 100cm² in ninety seconds, so the mask can be made cheaper than the N95 version with a melt-blown layer that is not very good for Earth. Testing antibacterial properties against activated carbon fibers and blown masks revealed that about 80% of bacteria are dormant after 8 hours compared to others in the single digits. If you keep them in the sun for 10 minutes, the blown cloth exceeds 85%, but graphene is 99.998%, meaning that a bacteria survives in 50K. The exact mechanism is not known, but [Dr. Ye] Thinks it may have something to do with the sharp edges of the graphene and the hydrophobic quality. A pair of coronovirus species were also affected, and the species causing COVID-19 will be tested this year.

A highly moist mask is nothing to sneeze at, so keep yourself in check and keep yourself glorious.

Thanks for the tip [Qes].

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