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India develops masks using electrostatics of materials to combat COVID 19

Face masks used by frontline healthcare professionals, which are of high technical quality, need special expertise for production, while a simple face mask that can contain the spread of the coronavirus is advised for the general public.

According to a press release, such a mask, though rudimentary in its action for containing the viral diffusion across the fabric layer, is expected to reduce the transmission of micro-droplets that linger in the air even during a conversation.

Simple, often, homemade ones are advised for healthy individuals rather than those meant for health workers as there is a limited supply of the latter. If only the choice of the fabric can be made intelligently, the mask can serve the purpose more efficiently.

A team of researchers at the Centre for Nano and Soft Matter Sciences (CeNS), Bangalore, an autonomous institute of the Department of Science and Technology (DST), have come up with a method to make face masks.

Called the TriboE Mask, it can hold electric charges to restrict the entry of infections but without any external power.

The release explained that when two non-conducting layers are rubbed against each other, the layers develop positive and negative charges instantly and continue to hold the charges for some time. They have used this electric field, quite strong at proximity, to deactivate or possibly even kill the germs.

A Professor in the research team said, “We have borrowed ideas from physics textbooks on triboelectricity; something kids enjoy playing with. When used in the context of a face mask, the idea can translate into a product, realisable by the end-user without the need of industry developing or manufacturing it. The mask is inexpensive and doable by anyone!”

He added that tests on these masks are being performed, particularly in the context of COVID-19.

A DST representative noted that it is interesting that several new and useful COVID-10 solutions have emerged by creative applications of basic principles of chemistry, physics, materials, and biosciences, often by stitching together of simple insights to provide an interdisciplinary solution. The mask proposed here is a good example of such a creative process that adds huge value by a simple design.

The mask is three-layered –a layer of nylon cloth sandwiched between polypropylene layers; the latter sourced from commonly used non-woven grocery bags. In place of nylon, silk fabric from a shawl may also be cut and used. When layers are rubbed against each other, the outer layers develop negative charges, while nylon will hold the positive charges.

This will act as double electric wall protection against the infectious entities crossing. As the mask is made out of commonly available fabrics, it can be washed just like any other cloth and can be reused. At this stage, the mask is, however, not recommended to healthcare professionals and patients.

TriboE mask comprising of polypropylene layers on the outside and nylon layer in between. When the layers are rubbed against each other, static electricity is produced, which is expected to restrict the possible transmission of infections.

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