20.500.12556/DiRROS-16239 Sustainable biocarbon/tung oil coatings with hydrophobic and UV-shielding properties for outdoor wood substrates With wood regaining substantial interest as a construction material due to sustainability concerns and aesthetics trends, efficient and safe protection methods are needed to prevent the discouloration and the loss of mechanical properties of this renewable and UV-sensitive material. In this study, sustainable coatings comprising 0 to 20 wt % biocarbon (BC) dispersed in tung oil were developed for wood protection. BC particles were added as ultraviolet (UV) absorbers and were produced by various carbonization routes. The BC powders were characterized in terms of particle size and surface functional groups by Fourier-Transform infrared, and the UV and visible absorbance of dispersed BC powders in water solutions were related to these characteristics. Two wooden substrates (beech and oak) were coated with the developed coatings and the samples underwent six months of onsite weathering. While the total colour change of uncoated samples and tung oil-coated substrates without BC kept increasing over time and resulted in a clear alteration of the wood surface aesthetics, an increased BC content in the coatings led to enhanced colour stability, with alteration of the colour close to 2 for both wood species after six months of weathering for 10 and 20 wt% BC. Coating with tung oil made the wooden substrates, initially hydrophilic, become hydrophobic, and the further introduction of biocarbon increased hydrophobicity. However, the increase in BC content was not correlated with an increase in water repellence, the highest water contact angle being observed for 5 % BC, and no further improvement in hydrophobicity was observed with higher BC content. The weathering negatively affected the water repellence of all the samples (i.e., reference samples and coated samples with various BC content). However, the introduction of 20 % BC best protected the decrease in water repellence induced by the onsite weathering. biocarbon biochar coating wood protection hydrophobic coating wettability ogljik oglje premaz zaščita lesa hidrofobni premaz omočljivost true false true Elsevier Angleški jezik Slovenski jezik © 2023 The Authors. Published by Elsevier B.V. Neznano 2023-02-10 07:20:14 2023-05-30 09:29:58 2023-06-15 09:52:01 0000-00-00 00:00:00 2023 0 0 Nasl. z nasl. zaslona; Opis vira z dne 3. 2. 2023; str. 1-10 [article no.] 107428 Vol. 177 Apr. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-01-25 620.1/.2 1873-331X 10.1016/j.porgcoat.2023.107428 140658435 https://www.sciencedirect.com/science/article/pii/S0300944023000243?via%3Dihub 1 fc412fb6-a90a-11ed-b359-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=21640 RAZ_Marrot_Laetitia_Sarah_Jennifer_2023.pdf RAZ_Marrot_Laetitia_Sarah_Jennifer_2023.pdf 1 BE9CC4B32EB09C3DBFE0B72B80DE7571 98d687357d5d0a48c9abd33f0f965e7ca59c5284132fda6052bfd1aeba2ee60f 2468317b-a90c-11ed-b359-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=21641 RAZ_Marrot_Laetitia_Sarah_Jennifer_2023.docx RAZ_Marrot_Laetitia_Sarah_Jennifer_2023.docx 1 982E40D7F37780D0D1BF8BA3AC656359 4cdcfb2aeca03cd4a2536598ee46667276c71a356762040cc8e22e87a17324a8 000fe3a6-feab-11ed-a314-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22449 Zavod za gradbeništvo Slovenije 0 0 0