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<p>Using durable photocatalytically active antibacterial surface coatings is a promising strategy to passively reduce transmission of harmful bacteria. However, as such coatings traditionally act via the production of reactive oxygen species, there is a risk that with time their integrity will be compromised. In this work stability, photocatalytic and antibacterial activity of UVA activable ZnO micro/nanoparticle and P25 TiO₂ nanoparticle-based polyacrylic surface coatings was studied during artificial ageing that was carried out over 9 weeks under UVA and high relative humidity. Analysis of SEM images and FTIR spectra indicated that polyacrylic matrix immobilized ZnO had minimal effect on physical and chemical stability of the coatings while TiO₂ severely degraded the acrylic polymer matrix. These changes led to significantly increased light-induced antibacterial activity of the UV-A aged TiO<sub>2</sub> coatings compared with their initial versions. This combined with the observation on displacement of TiO<sub>2</sub> material on UVA-aged surface coatings indicated poor stability of TiO<sub>2</sub>-based surface coatings under real-life use relevant aging conditions. On the other hand, ZnO-based surfaces retained their photocatalytic activity and although their antimicrobial efficacy slightly decreased during aging, they remained sufficiently active to induce bacterial killing within meaningful timeframe (e.g., 30 min).</p>

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Artificial aging induced changes in ZnO- and TiO₂-based polyacrylic surface coatings

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月17日

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  • Mati Kook,
  • Celeste Peterson,
  • Aadil Shafi Bhat,
  • Alexandra Nefedova,
  • Alexander Vanetsev,
  • Angela Ivask,
  • Vambola Kisand

摘要

Using durable photocatalytically active antibacterial surface coatings is a promising strategy to passively reduce transmission of harmful bacteria. However, as such coatings traditionally act via the production of reactive oxygen species, there is a risk that with time their integrity will be compromised. In this work stability, photocatalytic and antibacterial activity of UVA activable ZnO micro/nanoparticle and P25 TiO₂ nanoparticle-based polyacrylic surface coatings was studied during artificial ageing that was carried out over 9 weeks under UVA and high relative humidity. Analysis of SEM images and FTIR spectra indicated that polyacrylic matrix immobilized ZnO had minimal effect on physical and chemical stability of the coatings while TiO₂ severely degraded the acrylic polymer matrix. These changes led to significantly increased light-induced antibacterial activity of the UV-A aged TiO2 coatings compared with their initial versions. This combined with the observation on displacement of TiO2 material on UVA-aged surface coatings indicated poor stability of TiO2-based surface coatings under real-life use relevant aging conditions. On the other hand, ZnO-based surfaces retained their photocatalytic activity and although their antimicrobial efficacy slightly decreased during aging, they remained sufficiently active to induce bacterial killing within meaningful timeframe (e.g., 30 min).