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Antifungal efficiency assessment of the TiO2 coating on façade paints

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Abstract

The work studies the photocatalytic activity and the antifungal efficiency of the TiO2/Zn-Al coatings placed on the target commercial façade paints. The photocatalytic active nanocomposite based on TiO2 and Zn-Al-layered double hydroxides (ZnAl-LDHs) was synthesized by a wet impregnation technique with 3 % w/w TiO2. The freshly prepared suspension was applied by spray technique on the surfaces of the white façade paints. The goal of the work was to develop a method that quickly quantifies the antifungal activity of the commercial façade paints with and without biocidal components covered with a photocatalytic coating. The essence of the proposed method is the monitoring of the fungal growth (artificial ageing conditions) and the quantification of its development (UV-A 0.13 mWcm−2) on the façade paint surfaces. A special fungus nutrient (potato dextrose agar (PDA)) was inoculated with the spores of the Aspergillus niger ATCC 6275, and the test samples (façade paints with and without photocatalytic coating) were placed on the inoculated nutrient in the petri dishes. The images of the fungal growth on the samples of the facade paints, during a period of 5 days, were imported into Matlab R2012a where they were converted to binary images (BW), based on the adequate threshold. The percentage of the surface coverage was calculated by applying the specifically written program code which determines the ratio of the black and white pixels. The black pixels correspond to the surface covered with hyphae and mycelia of the fungus.

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Acknowledgments

The financial support from the Serbian Ministry of Education, Science and Technological Development (project no. III45008) and from the Provincial Secretariat for Science and Technological Development of Vojvodina Region (Contract No. 114-451-3426/2013-02) is gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Technology, University of Novi Sad, Bul. cara Lazara 1, 21000, Novi Sad, Serbia

    Snežana B. Vučetić, Ognjen Lj. Rudić, Siniša L. Markov, Oskar J. Bera, Ana M. Vidaković & Jonjaua G. Ranogajec

  2. Slovenian National Building and Civil Engineering Institute, Dimičeva 12, 1000, Ljubljana, Slovenia

    Andrijana S. Sever Skapin

Authors
  1. Snežana B. Vučetić
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  2. Ognjen Lj. Rudić
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  3. Siniša L. Markov
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  4. Oskar J. Bera
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  5. Ana M. Vidaković
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  6. Andrijana S. Sever Skapin
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  7. Jonjaua G. Ranogajec
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Correspondence to Jonjaua G. Ranogajec.

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Responsible editor: Philippe Garrigues

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Vučetić, S.B., Rudić, O.L., Markov, S.L. et al. Antifungal efficiency assessment of the TiO2 coating on façade paints. Environ Sci Pollut Res 21, 11228–11237 (2014). https://doi.org/10.1007/s11356-014-3066-6

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  • DOI: https://doi.org/10.1007/s11356-014-3066-6

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