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Preliminary evaluation of polydimethylsiloxane and hydrophobic silica nanoparticles to improve water repellency and boron leachability in wood

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Abstract

Polydimethylsiloxane (PDMS) and hydrophobic silica nanoparticles (HSNP) were applied to coat wood surfaces to decrease boron release from DOT (disodium octaborate tetrahydrate) treated wood. The surface-modified specimens were then subjected to a 14-day-leaching course followed by mold resistance tests under laboratory conditions. Water absorption, dimensional stability and water contact angle of the modified wood specimens were then determined. FTIR analysis and SEM imaging were also performed for characterization of the modified wood surfaces. Retention level of 3.3 kg/m3 was retained in the DOT and PDMS-treated wood specimens after the leaching process, but nearly no boron remained in the wood specimens treated with DOT only and DOT + HSNP. In accordance with leaching tests, the DOT and PDMS-treated specimens showed highest performance against mold fungi even after leaching tests; however, no complete protection was achieved in both DOT + HSNP and DOT-only treated specimens. The PDMS and HSNPs coated wood samples displayed water contact angles of 114° and 172°, respectively. The comparison of chemical, wetting and structural characteristics of the modified wood samples before and after leaching showed similar behavior. More detailed research is needed to obtain a better understanding of the mechanisms of interaction between PDMS/HSNP and wood surfaces.

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Authors and Affiliations

  1. Division of Forest Industrial Engineering, Department of Forest Biology and Wood Protection Technology, Faculty of Forestry, Istanbul University-Cerrahpaşa, 34473, Istanbul, Turkey

    Ekim Elçin Soytürk & S. Nami Kartal

  2. ERNAM—Erciyes University Nanotechnology Application and Research Center, 38039, Kayseri, Turkey

    M. Serdar Onses & Nusret Celik

  3. Department of Materials Science and Engineering, Erciyes University, 38039, Kayseri, Turkey

    M. Serdar Onses & Nusret Celik

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  1. Ekim Elçin Soytürk
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  2. S. Nami Kartal
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  3. M. Serdar Onses
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  4. Nusret Celik
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Contributions

All authors contributed to the conceptualisation and methodology of the study. Material preparation, data collection and analysis were performed by SNK, EES, MSO, and NC. The first draft of the manuscript was written by SNK and MSO and all authors commented on subsequent versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to S. Nami Kartal.

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Soytürk, E.E., Kartal, S.N., Onses, M.S. et al. Preliminary evaluation of polydimethylsiloxane and hydrophobic silica nanoparticles to improve water repellency and boron leachability in wood. Eur. J. Wood Prod. 81, 89–98 (2023). https://doi.org/10.1007/s00107-022-01883-7

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