20.500.12556/DiRROS-18572 Diketopyrrolopyrrole pigment core@multi-layer ▫$SiO_2$▫ shell with improved photochemical stability A model organic pigment (diketopyrrolopyrrole) is encapsulated by a silica coating in order to improve its photochemical stability. Unlike in previous works where single-layer silica coatings were used for similar purposes, we here propose creation of a multi-layer silica shell synthesized via in-situ sol-gel method, which should significantly improve the homogeneity and thus the protection ability of the coating. This is done by repeating the basic two-step process (pigment surface modification and silica encapsulation) several times, creating the final protective shell in a layer-by-layer fashion. The compositional and structural properties of the prepared coatings is studied using Fourier-transform infrared spectroscopy, differential thermal and thermogravimetric analysis, nitrogen adsorption measurements and transmission electron microscopy. Photochemical stability of non-encapsulated and encapsulated pigment particles is evaluated via the so-called fast-irradiation method. Various correlations between the essential coating properties, such as thickness, porosity, SiO2 content, and the corresponding photochemical stability of the samples are established and discussed in detail. As a whole, our results confirm the basic hypothesis, that multiple-layered silica shells show improved pigment protection ability in comparison to the single-layer coatings. organic pigments silica coating encapsulation morphology photocemical stability organski pigmenti SiO2 sloj enkapsulacija morfologija fotokemijska stabilnost true false true Elsevier Angleški jezik Slovenski jezik © 2018 The Authors. Published by Elsevier Ltd. Neznano 2024-03-27 08:40:38 2024-03-27 08:46:31 2024-03-28 03:33:43 0000-00-00 00:00:00 2018 0 0 Sodelavci: Zineb Saghi, Paul A. Midgley, Mojca Otoničar, Goran Dražić, Miran Gaberšček, Andrijana Sever Škapin; str. 108-115 Vol. 156 Sep. 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2018-03-29 54 0143-7208 10.1016/j.dyepig.2018.03.064 2357351 https://doi.org/10.1016/j.dyepig.2018.03.064 0 ed0f3f1c-ec04-11ee-9dd4-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=25322 RAZ_Svara_Fabjan_Erika_2018.pdf RAZ_Svara_Fabjan_Erika_2018.pdf 1 C0519BA54373E08FEE55439CC86D79C4 666332a72e8212dbce0ccb75fa41c14f242f19d97992b85d07205b154104d856 b7ae7d24-ec05-11ee-9dd4-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=25323 Zavod za gradbeništvo Slovenije 0 0 0