The impact of cerium dioxide nanoparticles on wood-coating system during weathering

U ovom je istraživanju ispitivana postojanost drva površinski obrađenog vodenom poliakrilatnom lazurom u koju su dodane nanočestice cerijevog (IV)-oksida pri ubrzanom laboratorijskom izlaganju. U istraživanju su korišteni nemodificirani i toplinski modificirani uzorci jasenovine. Nanočestice cerijevog oksida dodavane su u osnovni premaz u 3 različite koncentracije. Površinski obrađeni i neobrađeni (kontrolni) uzorci ubrzano su izlagani 6 tjedana u QUV uređaju opremljenom s UVA-340 lampama.Tijekom izlaganja na uzorcima je mjerena promjena boje i sjaja. Također je mjerena vodopropusnost sustava drvo-premaz potapanjem uzoraka. Rezultati istraživanja pokazuju da dodavanje nanočestica pozitivno utječe na postojanost toplinski modificiranih uzoraka, dok se za nemodificirane uzorake takav zaključak ne može donijeti. Nanočestice negativno utječu na sjaj uzoraka tijekom ispitivanja, dok utjecaja na vodoupojnost nemaThe durability of wood surface treated with water based acrylate varnish in which the nanoparticles of cerium (IV) oxide were added was researched during an accelerated laboratory exposure. Unmodified and thermally modified ash samples were used in this studiy. The nanoparticles of cerium oxide were added to the coating in 3 different concentrations. The coated and uncoated (control) samples were exposed for 6 weeks in the QUV device equipped with UVA-340 lamps. Color and gloss of the samples were measured during exposure. The permeability of wood-coating system was also measured by immersing samples in water. Results show that the addition of nanoparticles has a positive effect on the photostability of thermally modified samples, while for the non-modified samples such a conclusion cannot be made. Nanoparticles have a negative impact on gloss and no impact on water absorption