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7428 |
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Thursday, May 05, 2022, Hall G2 1:40 PM Medical Industry |
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Investigating the antiviral activity of thermal sprayed TiO2 coatings for highly touched surfaces |
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Elnaz Alebrahim* / Concordia University, Canada Christian Moreau / Concordia University, Canada Hediyeh Khatibnezhad/ Concordia University, Canada Morvarid M. Bajgiran/ Concordia University, Canada Magan Solomon/ University of McGill, Canada Lan Huong Nguyen/ Concordia University, Canada David Kwan/ Concordia University, Canada Chen Liang / University of McGill, Canada |
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Maurice Ringuette (University of Toronto), Rogerio S. Lima (National Research Council Canada), Bruno M. H. Guerreiro(National Research Council Canada), Jörg Oberste Berghaus (National Research Council Canada), Maniya Aghasibeig (National Research Council Canada), Steve Beaudin (Metal7), Adam Truchon (Metal7), Alexandre Gonçalves Andrade(Metal7), Alan Burgess(Spraywerx Technologies Inc.), Murray Pearson (Hatch). The World Health Organization reported in mid-September over 224 million cases of infection, including over 4.6 million deaths, due to the COVID-19 pandemic. This has created an urgent need to produce antiviral coatings as one of the potential solutions to mitigate the transmission of viral diseases. TiO2 as an efficient photocatalyst has attracted ever-growing attention as a candidate for viral disinfection under UVA light. We report the antiviral performance of sub-stoichiometric SPS TiO2-x coatings under both UVA and visible light. The photocatalytic activity of SPS TiO2-x coatings under visible light was attributed to a decrease in the band gap energy and a shift in the absorption edge within the visible light range due to the generation of oxygen vacancies in the thermal sprayed coatings. We also report antiviral performance of TiO2 composites with other oxides, such as Cu2O and Al2O3 produced using SPS, APS, and suspension HVOF techniques. Coatings were analyzed using SEM, XRD, and UV-vis spectrophotometer and were classified based on their surface roughness, porosity, and phase composition. Moreover, antiviral performance of all coated samples was assessed under UVA and ambient light. For these tests, a human common cold coronavirus, HCoV-229E, was initially used as a relevant surrogate for SARS-CoV-2, the cause of COVID-19, to evaluate the antiviral properties of the above coatings in a containment level-2 laboratory, before testing the top-performing coatings against SARS-CoV-2 in a containment level-3 facility. Collectively our data indicates that thermal sprayed TiO2-x coatings serve as a promising antipathogenic solution for indoor applications on highly touched surfaces as well as in ventilation systems. Moreover, the versatile and scalable thermal spray technology makes this process compatible with industrial production. |