| Title: | Diketopyrrolopyrrole pigment core@multi-layer ▫$SiO_2$▫ shell with improved photochemical stability |
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| Authors: | ID Švara Fabjan, Erika (Author)
ID Saghi, Zineb (Author)
ID Midgley, Paul A. (Author)
ID Otoničar, Mojca (Author)
ID Dražić, Goran (Author)
ID Gaberšček, Miran (Author)
ID Sever Škapin, Andrijana (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.1016/j.dyepig.2018.03.064
 PDF - Presentation file, download (1,78 MB)
MD5: C0519BA54373E08FEE55439CC86D79C4
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | 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. |
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| Keywords: | organic pigments, silica coating, encapsulation, morphology, photocemical stability |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 29.03.2018 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2018 |
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| Number of pages: | str. 108-115 |
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| Numbering: | Vol. 156 |
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| PID: | 20.500.12556/DiRROS-18572  |
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| UDC: | 54 |
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| ISSN on article: | 0143-7208 |
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| DOI: | 10.1016/j.dyepig.2018.03.064 |
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| COBISS.SI-ID: | 2357351 |
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| Copyright: | © 2018 The Authors. Published by Elsevier Ltd. |
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| Note: | Sodelavci: Zineb Saghi, Paul A. Midgley, Mojca Otoničar, Goran Dražić, Miran Gaberšček, Andrijana Sever Škapin;
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| Publication date in DiRROS: | 27.03.2024 |
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| Views: | 698 |
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| Downloads: | 280 |
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