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An Indian American-led research team at U.C. San Diego reports that if you are going to buy a face mask to protect yourself and others from COVID-19, make sure itâs a three-layered mask.
The Abhishek Saha-led team has now found an additional reason why three-layered masks are safer than single or double-layered alternatives, a UCSD release said.Â
While this advice was originally based on studies that showed three layers prevented small particles from passing through the mask pores, researchers have now shown that three-layered surgical masks are also most effective at stopping large droplets from a cough or sneeze from getting atomized into smaller droplets, the release said.
“Any form of mask is better than no mask,” says study co-author
Swetaprovo Chaudhuri, an associate professor at the U of T Institute for Aerospace Studies in the Faculty of Applied Science & Engineering.
“But what we also show is that if they have enough momentum, large liquid droplets can penetrate single or even double-layer masks. When they do, they break up into smaller droplets that are more persistent in the air.”
The team – which also includes Assistant Professor Abhishek Saha at the University of California, San Diego and Professor Saptarshi Basu of the Indian Institute of Science – is leveraging expertise they developed while studying aircraft engines. They use computer models and physical experiments to understand finely dispersed droplets in air, known as aerosols.
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