Indian Institute of Technology (IIT) Mandi researchers have developed a virus-filtering, self-cleaning and antibacterial material that can be used to make face masks and other PPE equipment. The material is developed by a team of four members led by Dr Amit Jaiswal, Assistant Professor, School of Basic Sciences, IIT Mandi. The other three researchers are Praveen Kumar, Shounak Roy, and Ankita Sarkar. Results of this work have recently been issued in the American Chemical Society – Applied Materials & Interfaces.
“Keeping the urgency of the pandemic situation and cost-effectiveness in mind, we have developed a strategy to repurpose existing PPEs, especially face masks, by providing an antimicrobial coating to these protective clothing/textiles,” said Dr Jaiswal.
For making this, the research team has used materials that are a hundred thousand times smaller than the width of the human hair to confer antimicrobial properties to polycotton fabric
Dr Jaiswal and his team have included nanometre-sized sheets of molybdenum sulphide, MoS2, the sharp edges, and corners of which act as tiny knives that pierce bacterial and viral membranes, thus killing them. “The ‘nanoknife’-modified fabrics demonstrated excellent antibacterial activity even after 60 cycles of washing,” said the lead researcher.
In addition to penetrating the microbial membranes, the nanosheets of molybdenum sulfide enable disinfection when exposed to light. Molybdenum sulphide exhibits photothermal properties, that is, it absorbs solar light and converts it into heat, which kills the microbes. “Within 5 min of solar irradiation, all the MoS2-modified fabrics showed 100% killing of both E. coli and S. aureus,” wrote the authors in their recently published paper. Thus, merely hanging out the masks in bright sunlight can clean the mask and make it ready to wear again.
They have also developed prototypes of a 4-layered face mask using the MoS2 modified fabric. And is reported that these masks, other than killing microbes and being light-cleanable, can also filter >96% of particles that are in the size range of the COVID Virus (120 nanometres), without compromising on the breathability of the fabric, and could thus be a powerful tool to prevent the spread of coronavirus and other microbial infections.
“We expect that the impact of this innovation on society will be immense and immediate, considering the current situation of the global COVID-19 pandemic,” said Dr Jaiswal.
The recommended materials can also be used to make screens or sheets for the creation of temporary isolation wards, containment cells and quarantines for holding individuals who come in contact with ..
Post Your Comments