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  • Surface properties of newly developed materials for the protection of cultural heritage objects
    Rudić, Ognjen Lj. ...
    Newly developed protective materials, two types of consolidant formulations (for carbonate and silicate based substrates) and the protective coating (based on double layered hydroxides associated ... with TiO2) were applied on porous mineral samples (handmade bricks and renders). The main aim of the investigation was the assessment of the surface properties (contact angle, roughness), antifungal effectiveness, self-cleaning activity and photoinduced hydrophilicity of the consolidated samples (treated only with the particular consolidant) and of the protected samples (treated with the consolidant and photocatalytic suspension) applied by two different application protocols. Forthe first application protocol, the photocatalytic suspension was applied 1, 2, 4 and 7 months after the consolidant, while in the case of the second application protocol, the photocatalytic suspension was deposited only after 1month after the application of the consolidant. Contact angle assessment and contactless diffusion reflection, DRIFT-FTIR analysis, were used in order to investigate surface properties of the consolidated and of the protected samples, while antifungal efficiency was determined by modified ISO-DIS13125 standard. Beside the surface properties analysis, the consolidated and protected samples were subjected to two types of the adhesion tests (weathering effect of rain and modified test with semitransparent pressure-sensitive tapes) in order to investigate the durability concerning the self-cleaning efficiency and photocatalytic activity. During the entire experimental period, intensive C-H stretching signals of the samples treated with silica based consolidants were detected by DRIFT-FTIR spectroscopy. This phenomenon could be related to the slight increase of the surface hydrophobicity over time (determined by contact angle analysis). The presence of vaterite on the surface of the samples treated with lime based consolidant indicates a slow reaction rate of the amorphous calcium carbonate into calciteform. Direct correlation between the values of the contact angle and antifungal activity was not noticed either for the brick, or for the render samples. Based on the obtained results, better antifungal activity and good durability considering self-cleaning efficiency and photocatalytic activity was observed for the samples treated with both materials, consolidant and protective coating, in comparison to the samples treated only with the developed consolidants. Based on the obtained results of hydrophilicity assessment by DRIFT-FTIR analysis, it was shown that the presence of the photocatalytic coating on the porous surface increased the quantity of the adsorbed water regardless to the performed application protocol. This phenomenon is a necessary condition for the development of surface hydrophilicproperties. Additionally, it was concluded that the surface characteristics (contact angle, roughness) and texture properties (capillary water absorbance, Hg porosimetry) of the porous samples coupled with the nature of the consolidates, as well as the interaction between the used consolidant and photocatalytic suspension, play important roles considering the antifungal and self-cleaning efficiency of the coated samples.
    Vir: Program in knjiga povzetkov = Program and book of abstracts (Str. 206)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2015
    Jezik - angleški
    COBISS.SI-ID - 2153319

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    http://icmt23.com/e_files/content/Book%20of%20abstracts.pdf

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