{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-9XGZZHB4/10a35c1a-fe9e-4db7-95b6-67a43e2e9138/PDF","dcterms:extent":"2808 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-9XGZZHB4/245b9c4d-3010-4be3-9ca3-fa553708b016/TEXT","dcterms:extent":"0 KB"}],"edm:TimeSpan":{"@rdf:about":"1998-2024","edm:begin":{"@xml:lang":"en","#text":"1998"},"edm:end":{"@xml:lang":"en","#text":"2024"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-9XGZZHB4","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-EGMI8DWJ"},{"@xml:lang":"sl","#text":"Les (Ljubljana)"}],"dcterms:issued":"2020","dc:creator":["Kumar Pandey, Krishna","Petrič, Marko","Srinivasa, Kavyashree"],"dc:format":[{"@xml:lang":"sl","#text":"številka:1"},{"@xml:lang":"sl","#text":"letnik:69"},{"@xml:lang":"sl","#text":"str. 57-70"}],"dc:identifier":["ISSN:0024-1067","COBISSID_HOST:20473347","URN:URN:NBN:SI:doc-9XGZZHB4"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije"},"dc:subject":[{"@xml:lang":"sl","#text":"cerijev dioksid"},{"@xml:lang":"sl","#text":"Cerium oxid"},{"@xml:lang":"sl","#text":"colour stability"},{"@xml:lang":"sl","#text":"fotostabilnost"},{"@xml:lang":"sl","#text":"kavčukovec"},{"@xml:lang":"sl","#text":"nanodelci"},{"@xml:lang":"sl","#text":"nanoparticle"},{"@xml:lang":"sl","#text":"photostability"},{"@xml:lang":"sl","#text":"PU coating"},{"@xml:lang":"sl","#text":"PU premaz"},{"@xml:lang":"sl","#text":"Rubberwood"},{"@xml:lang":"sl","#text":"stabilnost barv"}],"dcterms:temporal":{"@rdf:resource":"1998-2024"},"dc:title":{"@xml:lang":"sl","#text":"Photostabilization of rubberwood using cerium oxide nanoparticles| Fotostabilizacija lesa kavčukovca z nanodelci cerijevega dioksida|"},"dc:description":[{"@xml:lang":"sl","#text":"Light induced darkening and deterioration of wood used outdoors is undesirable. Photoprotection of wood could be achieved by using additives that reflect or absorb harmful radiation responsible for degradation. Nano metal oxides have strong absorption in the UV range of solar radiation and good transparency in the visible region. They offer unique benefits in protecting coatings and coated substrates from being degraded by UV radiation. However, to exploit the properties of nanoparticles, homogenous dispersion without agglomeration is necessary. In the present work, the photostabilization of rubberwood surfaces coated with cerium oxide (CeO2) was studied. The nanoparticles were surface functionalized with an organic alkoxy silane (3-glycidyloxypropyltrimethoxy silane) to improve the homogenous distribution in coatings, and the modified nanoparticles were dispersed in isopropanol and polyurethane (PU) coating. Rubberwood surfaces coated with dispersed nanoparticles (concentration 0.5 % to 6 % w/v) were ex-posed to a fluorescent UVA light source (%=340 nm) at 60 °C in an accelerated weathering tester for 500 h and 1000 h. Colour changes due to UV light exposure were monitored using a spectrocolourimeter. Dispersion of CeO2 nanoparticles in PU coatings (concentration >2 %) restricted the photoyellowing of wood polymers"},{"@xml:lang":"sl","#text":"Degradacija in potemnitev lesa, ki je v uporabi na prostem, je nezaželena. Les je pred učinki svetlobe možno zaščititi z dodatki, ki odbijajo ali absorbirajo škodljivo sevanje, ki povzroča njegovo razgradnjo. Nano kovinski oksidi izkazujejo močno absorpcijo svetlobe v UV območju sončnega sevanja in dobro transparentnost v vidnem območju. Zato ponujajo edinstvene prednosti pri zaščiti premazov in površinsko obdelanih substratov, ki so občutljivi na UV sevanje. Vendar pa je za izkoriščanje zaščitnih lastnosti nanodelcev potrebna njihova homogena disperzija, tako da se ne tvorijo aglomerati. V tem prispevku poročamo o raziskavah fotostabilizacije površin lesa kavčukovca z nanodelci cerijevega dioksida (CeO2). Nanodelci so bili površinsko funkcionalizirani z organskim alkoksi silanom (3-glicidiloksi propiltrimetoksi silan) za izboljšanje homogene porazdelitve v premazih. Modificirane nanodelce smo dispergirali v izopropanolu in v poliuretanskem (PU) premazu. Površine lesa kavčukovca, na katere smo nanesli dispergirane nano-delce (koncentracija od 0,5 % do 6 % m/v), smo v napravi za umetno pospešeno staranje za 500 ur in 1000 ur in pri 60 °C izpostavili UVA svetlobi (% = 340 nm). Barvne spremembe zaradi izpostavitve UV svetlobi smo spremljali s kolorimetrom. Disperzija nanodelcev CeO2 v PU premazih (koncentracija >2 %) je zmanjšala foto-rumenenje lesnih polimerov"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-9XGZZHB4","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-9XGZZHB4"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-9XGZZHB4/10a35c1a-fe9e-4db7-95b6-67a43e2e9138/PDF"},"edm:rights":{"@rdf:resource":"http://creativecommons.org/licenses/by-nc/4.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Zveza lesarjev Slovenije"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-9XGZZHB4/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-9XGZZHB4"}}}}