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Production of a sprayable waterborne polyurethane coating with silver nanoparticles for combating SARS-CoV-2

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Abstract

To halt the ongoing global pandemic of SARS-CoV-2, the use of antiviral surfaces becomes an interesting alternative to prevent the spread of pathogens through contaminated surfaces. In this context, waterborne polyurethane coatings with silver nanoparticles (WPU/AgNPs) were synthesized in order to confer antiviral activity to the nanocomposites for further application on surfaces. The chemical structure, physico-mechanical properties, cytotoxic, antibacterial, and antiviral properties of WPU/AgNPs nanocomposites were evaluated. The addition of nanoparticles in WPU did not change the structure of the polymer chain; hence, properties such as hardness, tensile strength, and elongation were not influenced. However, an increase in the surface hydrophobicity followed by a slight yellowing due to the intrinsic color of the nanosilver was observed. Furthermore, the nanocomposites did not show in vitro cytotoxicity for BALB/3T3 cells. The nanocomposites were tested against SARS-CoV-2, obtaining inactivation yields greater than 99.0%, and antibacterial activity against Escherichia coli and Staphylococcus aureus even after three months of use. Hence, these nanocomposites were produced as a sprayable polyurethane for surface coatings application, providing a fantastic finish to all kinds of surfaces such as tables, handrails, switches, and doorknobs. This finish is durable, attractive, and long-lasting.

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Acknowledgments

The authors acknowledge Brazilian Agency Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil)—(Finance Code 001) and Financiadora de Estudos e Projetos/Ministério da Ciência, Tecnologia, e Inovações (FINEP/MCTI, Brazil—Grants: 03.20.0154.00).

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Authors and Affiliations

  1. Postgraduate Program in Materials Science and Engineering (PGMAT), University of Caxias Do Sul, Caxias do Sul, RS, Brazil

    Lucas Dall Agnol, Juliano Roberto Ernzen & Otávio Bianchi

  2. Mantoflex Indústria de Plásticos Ltd., Caxias do Sul, RS, Brazil

    Lucas Dall Agnol, Heitor Luiz Ornaghi Jr. & Juliano Roberto Ernzen

  3. Department of Organic Chemistry, Institute of Chemistry, Federal University of Rio Grande Do Sul (UFRGS), Porto Alegre, RS, Brazil

    Fernanda Trindade Gonzalez Dias

  4. Department of Materials Engineering (DEMAT), Federal University of Rio Grande Do Sul (UFRGS), Porto Alegre, RS, Brazil

    Otávio Bianchi

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  1. Lucas Dall Agnol
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  2. Heitor Luiz Ornaghi Jr.
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  3. Juliano Roberto Ernzen
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  4. Fernanda Trindade Gonzalez Dias
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Correspondence to Lucas Dall Agnol.

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Dall Agnol, L., Ornaghi, H.L., Ernzen, J.R. et al. Production of a sprayable waterborne polyurethane coating with silver nanoparticles for combating SARS-CoV-2. J Coat Technol Res 20, 1935–1947 (2023). https://doi.org/10.1007/s11998-023-00788-1

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