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• Diketopyrrolopyrrole pigment core@multi-layer $SiO_2$ shell with improved photochemical stability
Švara Fabjan, Erika ...
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.
Vir: Dyes and pigments. - ISSN 0143-7208 (Vol. 156, Sep. 2018, str. 108-115)
Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
Leto - 2018
Jezik - angleški
COBISS.SI-ID - 2357351
vir: Dyes and pigments. - ISSN 0143-7208 (Vol. 156, Sep. 2018, str. 108-115)