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Education21

Using coating developed by IIT Guwahati ordinary cloth masks can give better protection against COVID-19

education by education
November 29, 2021
in Higher Edu, Latest
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Using coating developed by IIT Guwahati ordinary cloth masks can give better protection against COVID-19
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Indian Institute of Technology Guwahati researchers have developed a ‘Nanometer Thick Superhydrophobic Coating’ material to modify ordinary cloth or silk masks that will maintain its comfort but offer better protection against aerosol-driven infections such as COVID-19. Importantly it offers an alternative to N95 masks.

A cloth mask is largely porous to aerosol and thus cannot effectively prevent COVID-19 type infection. Although still better than wearing no mask, an improved version that would prevent the entry or exit of the aerosol from the modified cloth mask was needed. “We have worked on that based on the principle of repulsion of the aerosol by the modified cloth while allowing the air to flow through the mask. A simple coating of the hydrophobic molecule on the silk cloth worked well here,” revealed the researcher team  led by Prof. Arun Chattopadhyay, Department of Chemistry and Centre for Nanotechnology, IIT Guwahati and Dr. Partho S. G. Pattader, Department of Chemical Engineering, School of Health Science and Technology, and Centre for Nanotechnology, IIT Guwahati.

The breathability was tested by measuring the oxygen permeation through the mask with the help of an instrument called Gas Chromatography. The penetration of oxygen reduces by only 22% for the modified Eri silk mask compared to the natural Eri silk mask, whereas for N95 the reduction with respect to the natural Eri silk came out to be around 59%. Hence, the modified silk mask is way more breathable than the N95 mask but with almost similar protection against aerosol-driven infections.

According to World Health Organisation (WHO) guidelines, N95 masks or double masking protects people to a great extent from Coronavirus. But the drawback is that people undergo suffocation after wearing them for a long time. Besides, N95 are costly and thus unaffordable to large sections of the population. Instead, people resort to cheaper and readily-available cloth and silk masks.

To address these challenges and to bring in a safer, economical and comfortable alternative the  coating material can modify the easily-available cloth mask into a hydrophobic mask to repel virus-laden droplets and avoid breathing difficulties even when worn for a longer period of time. Another advantage is that these masks are versatile and can be used with other additives such as antibacterial nanomaterial for additional protection against viruses.

This work is recently published in the reputed peer-reviewed journal ACS Applied Bio Materials (https://pubs.acs.org/doi/full/10.1021/acsabm.1c00851).

 

 

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