New cloth mask kills 99.9 per cent bacteria, viruses in one hour of sunlight, says study


PTI, Nov 12, 2020, 5:54 PM IST

Los Angeles: Researchers have developed a reusable cotton face mask that they say can kill up to 99.99 per cent of bacteria and viruses within 60 minutes of daylight exposure.

Face masks made of various cloth materials can filter nanoscale aerosol particles — such as those released by a cough or sneeze — potentially helping to reduce the spread of diseases, including COVID-19.

However, live bacteria and viruses on the surface of the mask could still be contagious, according to the study published in the journal ACS Applied Materials & Interfaces.

The researchers from the University of California, Davis in the US developed a new cotton fabric that would release reactive oxygen species (ROS) when exposed to daylight, killing microbes attached to the fabric’s surfaces while being washable, reusable and safe for the wearer.

A person could disinfect their cloth mask during their lunch hour outside in the sun, or by spending a longer period of time under office or building lights, which are much less intense than sunlight, they said.

The researchers made their antimicrobial fabrics by attaching positively charged chains of 2-diethylaminoethyl chloride (DEAE-Cl) to ordinary cotton.

They then dyed the modified cotton in a solution of a negatively charged photosensitizer — a compound that releases ROS upon exposure to light — which attached to the DEAE chains by strong electrostatic interactions.

The team found that a fabric made with a dye called rose Bengal as the photosensitiser killed 99.9999 per cent of bacteria added to the fabric within 60 minutes of daylight exposure and inactivated 99.9999 per cent of T7 bacteriophage — a virus thought to be more resistant to ROS than some coronaviruses — within 30 minutes.

Further testing showed that the material could be handwashed at least 10 times and constantly exposed to daylight for at least 7 days without losing its antimicrobial activity, the researchers said.

The fabric shows promise for making reusable, antibacterial/antiviral cloth face masks and protective suits, they said.

Udayavani is now on Telegram. Click here to join our channel and stay updated with the latest news.

Top News

Noida: Pit bull mauls child as its owner looks on; 2 held

B’luru: Man blackmails wife for dowry with her explicit photos and videos

Bhagwant Mann is AAP’s CM face for Punjab assembly polls

Some COVID-19 patients may be infectious even after ten days: Study

India to provide assistance to the families of two Indians killed in UAE: Envoy

SC to consider hearing plea seeking disclosure of criminal background of candidates before polls

Belagavi: Bommai seeks report in case related to death of three babies


Related Articles More

Cyberattacks surge amid accelerating pace of COVID-driven digitalisation: WEF study

AskSid – the digital assistant of choice for Danone Nutricia, the world leader in early life nutrition

Phytochemicals discovered in Himalayan plant Buransh that inhibit COVID-19 virus

Microsoft discloses malware attack on Ukraine govt networks

Rogue planets: how wandering bodies in interstellar space ended up on their own

MUST WATCH

Night Curfew : Shops, stall will close before 10pm(jan 17)

NEWS BULLETIN 17-01-2022

THE HISTORY OF KRISHNAPURA MUTT SWAMIJI

DOCTOR BEATS UP A VEGETABLE VENDOR

Vidyasagara Teertha Swamiji Paryaya Message


Latest Additions

Noida: Pit bull mauls child as its owner looks on; 2 held

Cyberattacks surge amid accelerating pace of COVID-driven digitalisation: WEF study

EVRE enables EV Fast-Charging infrastructure at all its 52 EV hubs

B’luru: Man blackmails wife for dowry with her explicit photos and videos

Yellapura: Woman gives birth to twins in 108 ambulance

Thanks for visiting Udayavani

You seem to have an Ad Blocker on.
To continue reading, please turn it off or whitelist Udayavani.