Health
Researchers test face masks to reveal least effective type against coronavirus
Key Point
- Masks are mandatory in many states
- Researchers ranked which of the common masks are the most effective or the least effective
- N95 masks are still the most effective in controlling the spread of the virus
Researchers have developed tests to help determine the types of face masks that are effective in preventing the spread of coronaviruses.
The gradual resumption of the economy has also created a new normal, where people need to keep a safe distance from others and wear masks to prevent the spread of the virus. With this new standard, there is a proliferation of different types of masks sold online and onsite. However, the question is which of these masks provides the best protection and which does not.
With this in mind, a group of researchers at Duke University have developed a simple method to help analyze the effects of different types of masks. This is now an essential element for those who are adventurous in public.
According to Martin Fisher, one of the study’s authors, Quest says a local group buys masks in bulk for distribution by a professor of medicine at Duke University to those who need them in a local group. Born after trying to help. The professor wanted to make sure the group actually got an effective mask.
In Study published on Friday, August 7Researchers in the Duke Department of Physics, using a laser beam and a mobile phone, demonstrated a simple method that helps assess the effectiveness of masks on the propagation of respiratory droplets while speaking naturally.
Fisher told CNN A laser, black box and camera were used for the test. “The laser beam is expanded vertically to form a thin sheet of light that illuminates it through the left and right slits in the box,” he said.
They drilled a hole in front of the box so that the speaker could talk to it. A cell phone camera is then placed on the back of the box to capture light that can scatter in various directions as the breathing droplets pass through the beam as the speaker speaks.
Researchers tested a total of 14 masks, including a professional, close-fitting N95 mask often reserved for healthcare professionals. Other masks consisted of surgical masks, cotton masks, neck fleece, folded bandanas and knit masks.
At the beginning of the test, the speaker spoke through the hole without wearing any type of face covering. Then I spoke through the hole again. Only this time, they already have a mask type. Researchers have tested each mask at least 10 times.
At the end of the test, we found that the most effective of the 14 were the professional N95 masks, followed by a 3-layer surgical mask. Cotton masks made by many people at home were also strong.
The neck fleece, also known as the gaiter mask often used by runners, had the least effect. Researchers conclude This type of mask can even cause a large amount of respiratory splashes The material appears to break up huge droplets into smaller particles that can easily be carried away by air to another area.
In the case of knit masks and folding bandanas, the performance of these two masks was also poor and unprotected at all.
Fisher and his colleagues were surprised that the number of particles measured when using the fleece was actually large compared to speaking without a mask. “We want to emphasize that we really encourage people to wear masks, but we want them to wear working masks,” he added.
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