April 26, 2020

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Academic worker Stanislav Polzer from VŠB-Technical University of Ostrava (VŠB-TUO) put together a guide on how everyone can make a cloth filter that will have antiviral effects (Corona-Antivirus). It was based on an earlier idea of a Canadian professor, which he reported on the scientific journal Scientific Reports. Docent Polzer published his solution on Facebook and confided in it with the News.

“Since there is still a lack of substantial protection, we have to make it ourselves. Colleagues at the Technical University of Liberec started to produce filters for nanofiber cloths, I from the Technical University of Ostrava enclose instructions on how to improve the protection against coronavirus. This is not esotericism, but a top science from Canada, ”wrote Polzer, who works at the Department of Applied Mechanics at the Faculty of Mechanical Engineering at VŠB-TUO.

Use the salt solution

The Canadian authors of the article, who worked on a general virus protection filter, discovered in 2017 that if we rinse our filter in a veil of strong common salt, we get excellent antivirus protection.

An innovative virus elimination solution was introduced in the video a year later by Professor Hyo-Jick Choi of the University of Albert, Canada. The method transforms masks (literally) into virus killers, the Edmonton Journal wrote. Existing masks and respirators can capture viral droplets, but the virus itself is still infectious on the protective mask, so Choi has improved it with a simple weapon: salt.

Hyo-Jick Choi shows that salt can kill viruses.

It was Choi’s “salt” procedure that Polzer inspired his filter. “Virus filtration is still about 40 to 70 percent after 24 hours, with 85 percent at the beginning. But most importantly, even infiltrated influenza viruses were no longer able to cause disease, ”he said. He added that 99.9 percent of viruses were killed on the filter within five minutes and all within one hour.

“In other words, it dramatically reduces the risk of secondary transmission by touching the contaminated veil and then transferring the virus to another object,” he explained.

Moreover, according to him, protection works even in damp and all day, so there is no need to change the mask every moment for a new one. “Which few do, because there are still few,” he said.

Therefore, it can also serve as a protective layer in the mask against the new SARS-CoV-2 virus, which causes Covid-19 disease. “Of course, it has not been tested against topical coronavirus, but there is a huge chance that it will work the same way. The principle is physical – high osmotic pressure destabilizes proteins. Therefore, I appeal to everyone to make such a filter, ”he stressed.

HOW TO MAKE CORONA-ANTIVIRUS STEP BY STEP

1) Unscrew the disposable surgical mask and remove the middle layer. Who does not, use some artificial fabric, such as non-woven fabric for gardens, etc.

2) Prepare 300 g of salt and a large kitchen spoon of washing powder or spring.

3) The article in Nature Scientific Reports used polysorbate 20, but probably no one in the shelf. It is only a matter of reducing the surface tension of the water so that the solution can wrap all the fibers.

4) Pour a liter of hot water into a 1-liter measuring cup, add the powder and pour the salt over it. 

5) Mix well to dissolve the salt (ideally all).

6) Soak the fabric in 25 ml of solution (place 5 teaspoons on a bowl or plate) and wean overnight.

Place 55 ml of the solution (11 teaspoons) on the second plate, place the fabric in it and place in the oven at 40 ° C until all the liquid has evaporated.

Put in your textile drape with filter pocket and you have protection all day long.

In the evening after coming home throw the whole mask in hot water for 30 minutes, then remove the filter from it and refill it with brine. A liter will last about 14 days.

“Even with this filter, however, you must not stop being careful, because your veil will still not have solved the seals and you are drawing a lot of air around it,” he pointed out. After all, respirators have the same problem, albeit on a smaller scale. But according to Polzer, they are already working on this at VŠB-TUO.

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