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Source: UV Light and COVID-19  Jun 03, 2020  1 year ago
UV Light: Eradicating SARS-CoV-2 Coronavirus That Causes COVID-19 With Handheld UV Light Devices
UV Light: Eradicating SARS-CoV-2 Coronavirus That Causes COVID-19 With Handheld UV Light Devices
Source: UV Light and COVID-19  Jun 03, 2020  1 year ago
UV Light: Researchers at Pennsylvania State University, the University of Minnesota, University of Tokyo and Tohoku University in a joint research have ascertained that personal, handheld devices emitting high-intensity ultraviolet light are feasible for ‘killing’ the SARS-CoV-2 coronavirus.  


 
The study findings are published in the journal: Nature’s Communication Physics. https://www.nature.com/articles/s42005-020-0372-9
 
Typically there are two commonly employed methods to sanitize and disinfect areas from bacteria and viruses ie chemicals or ultraviolet radiation exposure.
 
It is known that UV radiation is in the 200 to 300 nanometer range is able to destroy the virus, making the virus incapable of reproducing and infecting.
 
Despite widespread adoption of this efficient UV approach is much in demand during the current pandemic it requires UV radiation sources that emit sufficiently high doses of UV light. While devices with these high doses currently exist, the UV radiation source is typically an expensive mercury-containing gas discharge lamp, which requires high power, has a relatively short lifetime, and is bulky.
 
The only solution is to develop high-performance, UV light emitting diodes, which would be far more portable, long-lasting, energy-efficient, and environmentally benign. While these LEDs exist, applying a current to them for light emission is complicated by the fact that the electrode material also has to be transparent to UV light.
 
Roman Engel-Herbert, Penn State Associate Professor of materials science, physics, and chemistry told Thailand Medical News, “You have to ensure a sufficient UV light dose to kill all the viruses. This means you need a high-performance UV LED emitting a high intensity of UV light, which is currently limited by the transparent electrode material being used.”
 
Although finding transparent electrode materials operating in the visible spectrum for displays, smartphones and LED lighting is a long-standing problem, the challenge is even more difficult for ultraviolet light.

Joseph Roth, doctoral candidate in Materials Science and Engineering at Penn State said, “There is currently no good solution for a UV-transparent electrode. Right now, the current material solution commonly employed for visible light application is used despite it being too absorbing in the UV range. There is simply no good material choice for a UV-transparent conductor material that has been identified.”
 
Importantly, finding a new material with the right composition is key to advancing UV LED performance.
 
The research team from Penn State, in collaboration with materials theorists from the University of Minnesota, recognized early on that the solution for the problem might be found in a recently discovered new class of transparent conductors. When theoretical predictions pointed to the material strontium niobate, the researchers reached out to their Japanese collaborators to obtain strontium niobate films and immediately tested their performance as UV transparent conductors. While these films held the promise of the theoretical predictions, the researchers needed a deposition method to integ rate these films in a scalable way.
 
Roth added, “We immediately tried to grow these films using the standard film-growth technique widely adopted in industry, called sputtering and we were successful.”
 
Significantly, this was a critical step towards technology maturation which makes it possible to integrate this new material into UV LEDs at low cost and high quantity. And both Engel-Herbert and Roth believe this is necessary during this crisis.
 
Roth added, “While our first motivation in developing UV transparent conductors was to build an economic solution for water disinfection, we now realize that this breakthrough discovery potentially offers a solution to deactivate COVID-19 in aerosols that might be distributed in HVAC systems of buildings.
 
 It was recommended that other areas of application for the UV virus disinfection are densely and frequently populated areas, such as theaters, sports arenas, and public transportation vehicles such as buses, subways, and airplanes.
 
For more on UV Light applications to disinfect against the SARS-CoV-2 coronavirus that causes the deadly COVID-19 disease keep on logging to Thailand Medical News.
 

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Feb 05, 2020  2 years ago
Source : Thailand Medical news