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Surface coated ZnO powder as flame retardant for wood: A short communication
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Polymers & Functional Materials Division, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad, 500007, Telangana, India.
Whiting School of Engineering, Johns Hopkins University, Baltimore, MD 21218, United States.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-4720-5380
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2023 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 897, article id 165290Article in journal (Refereed) Published
Abstract [en]

In the present study, the ability of a coating of zinc oxide (ZnO) powder to improve the fire-safety of wood exposed to radiative heat flux was examined, focusing on the ignition time of the wood. To test ZnO's efficiency on the wood substrate, two different amounts of ZnO (0.5 and 1 g ZnO per dm2) were applied to the wood surface and exposed to radiative heat from a cone calorimeter wherein a pristine piece of wood with no ZnO treatment was taken as control. The experiments were conducted at three different irradiation levels i.e., 20, 35, and 50 kWm−2. The results showed that applying ZnO on the surface of the wood significantly increased the ignition time (TTI). For the three different heat fluxes, using 0.5 g ZnO per dm2 coating on the wood surface increased the TTI by 26–33 %. Furthermore, the application of 1 g of ZnO per dm2 generated a TTI increment of 37–40 %. All three irradiation levels showed similar trends in TTI. The micrographs taken before and after combustion showed no significant disparity in the morphology of ZnO. The agglomerated ZnO particles on the wood surface remained intact after combustion. This study demonstrates a facile method of using ZnO to delay the ignition of wood. This could potentially impart fire-safety to wooden structures/façades in wildland-urban interfaces and elsewhere by reducing flame spread.

Place, publisher, year, edition, pages
Elsevier B.V. , 2023. Vol. 897, article id 165290
Keywords [en]
Cone calorimeter, Fire, Flame retardancy, Wildland-urban interface, Wood, ZnO
National Category
Other Civil Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-99288DOI: 10.1016/j.scitotenv.2023.165290ISI: 001046932000001PubMedID: 37406703Scopus ID: 2-s2.0-85164736599OAI: oai:DiVA.org:ltu-99288DiVA, id: diva2:1786269
Note

Validerad;2023;Nivå 2;2023-08-08 (joosat);

Licens fulltext: CC BY License

Available from: 2023-08-08 Created: 2023-08-08 Last updated: 2024-03-07Bibliographically approved

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Mensah, Rhoda AfriyieFörsth, MichaelSas, GabrielDas, Oisik

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