Etching grooves onto facemasks to make them repel droplets better

A team of researchers at Korea Institute of Science and Technology, working with a colleague from Korea University, has found that etching grooves onto the surface of face masks makes them better at repelling water droplets and thus more effective at preventing the spread of disease.

source https://medicalxpress.com/news/2022-12-etching-grooves-facemasks-repel-droplets.html