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Can we prevent the spread of homemade mask Covid 19 when we sneeze?

NEW YORK (Reuters Health) – Masks made from ordinary homemade fabrics help stem the spread of viruses such as Covid-19 because researchers have found they are more effective at stopping droplets from biting, coughing and sneezing. , Even like a layer.
For the study, published in Matrix Extreme Mechanics Letters, the researchers tested the effectiveness of common household fabrics ranging from new and used clothing, quilts, bed sheets and dish cloth materials to prevent droplets. Are
Aerosol particles are generally classified as less than five micrometers, and in the range of hundreds of nanometers.
However, when a person speaks, coughs or sneezes, large drops – up to about a millimeter in diameter.
These large droplets are a nuisance because, at high speeds, they can squeeze holes in some fabric, break up small droplets and become airborne.
However, in order for a person to feel compelled to wear a mask, it must be comfortable and breathable, the researchers said.
The team tested the ability of 11 common household fabrics to breathe and stop droplets, using a medical mask as a benchmark.
The researchers then characterized the fabrics in terms of their construction, fiber content, weight, thread count, porosity, and water absorption rate.
“Checking the breathability of these clothes was the easy part.”
“We easily measured the rate of air flow through the cloth. Testing the ability to stop droplets is a bit complicated.”
In the lab, researchers fill the nozzle of an inhaler with stagnant water with the help of easily detectable 100 nanometer-diameter fluorescent particles – in the form of a novel coronavirus particle.
When puffed, the breather forces water through the nozzle and produces high-speed droplets that accumulate on a plastic dish placed in front of the breath.
To test the fabric, researchers combine this process with various substances that are placed on the collection dish.
“We count the number of nanoparticles landing on the dish using a high-resolution confocal microscope. We then calculate the proportion of the number of particles deposited with and without the fabric to show us how to prevent droplets,” Saif said. Can provide an estimate of. ”
The team also measured the speed of the particles extracted from the anvil using high-speed video.
“We found that all the fabrics tested were effective enough to prevent 100 nanometer particles from being driven by high-speed droplets, which could be released from speaking, coughing and sneezing, even a As a layer. ”
“With two or three layers, even more permeable fabrics, such as T-shirt fabrics, achieve drop-blocking performance that is like a medical mask, while still maintaining comparable or better breathability. Have. ”


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