New Delhi :
Indian Institute of Technology, Bombay (IIT Bombay) study has provided insights into how Covid-19 virus survives on surface. The study by has revealed that COVID-19 virus survives on solid surfaces for hours or days by clinging to thin liquid films. It is ideal to disinfect frequently touched surfaces to prevent & contain the spread of coronavirus.
Liquid film remaining after the evaporation –
The study attributes the long survival time of the novel coronavirus on a surface to the slow evaporation of a thin nanometre liquid film remaining after the evaporation of the bulk droplet. The ability to predict the survival of the novel coronavirus on different surfaces can help prevent and contain the spread of Covid-19. While the typical respiratory droplets dry within seconds, the survival time of the SARS-CoV-2 virus on different surfaces within recent experiments has been found to be on the order of hours, the researchers said.
A study by @iitbombay has revealed the #COVID-19 virus survives on solid surfaces for hours or days by clinging to thin liquid films. It is ideal to disinfect frequently touched surfaces to prevent & contain the spread of #coronavirus. #Unite2FightCoronahttps://t.co/Hb5HNurgbo pic.twitter.com/eYApPsj13u
— Ministry of Education (@EduMinOfIndia) December 6, 2020
Survival time of the Covid-19 virus on surfaces –
According to the researchers, This discrepancy suggests an orders of magnitude difference in the time between droplet drying and the survival time of the Covid-19 virus on surfaces. Van der Waals forces include attraction and repulsions between atoms, molecules, and surfaces, as well as other intermolecular forces.
Observed in measurements of the virus titer –
“Our model for the thin film transport shows that survival or drying time of a thin liquid film on a surface is on the order of hours and days, similar to what has been observed in measurements of the virus titer. It captures the relatively longer survival time on plastic and glass compared to metals” said Amit Agrawal, professor at Indian Institute of Technology (IIT) Bombay.
Evaporating nanometric film is providing the medium –
“Our biggest surprise was that the drying time of this nanometric film is on the order of hours,” said Rajneesh Bhardwaj, a professor at IIT Bombay. “It suggests the surface isn’t completely dry, and the slowly evaporating nanometric film is providing the medium required for the survival of the coronavirus,” Bhardwaj said.
Such as door handles or hand-held devices –
Since a longer survival time of the virus corresponds to increased chances of being infected, the researchers said it is desirable to disinfect frequently touched surfaces, such as door handles or hand-held devices, and within hospitals and other areas prone to outbreaks. “We also recommend heating surfaces, because even short duration high temperatures, at which the surface is at a higher temperature than the ambient, can help evaporate the nanometric film and destroy the virus,” Bhardwaj added.
The journal focus is the dynamics of gases –
This study is published in the journal Physics of Fluids. Physics of Fluids is a monthly peer-reviewed scientific journal covering fluid dynamics, established by the American Institute of Physics in 1958, and is published by AIP Publishing. The journal focus is the dynamics of gases, liquids, and complex or multiphase fluids—and the journal contains original research resulting from theoretical, computational, and experimental studies.