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<p>Mold is a common cause of degradation and decay of wood furniture and structures, leading to health risks and loss of aesthetics. Several coating methods have been developed to bestow mold resistance to wood surfaces. However, few studies have utilized photodynamic inactivation (PDI) as the mold inhibition mechanism for wood coatings. In this study, a polysiloxane-based coating incorporated with Rose Bengal Lactone (RBL) as a photosensitizer was developed on poplar woods at loadings of 0.1, 0.2, and 0.4&#xa0;mg ml<sup>− 1</sup>. The polymeric coating was hydrophobic, with the highest water contact angle of 128.20° and demonstrated resistance to scratches during handling. The anti-mold performance was tested against the soft-rot fungus <i>Chaetomium globosum.</i> The polymer-coated wood samples were incubated with and without light irradiation. The dark cultures showed growth inhibition on the coated surface due to surface hydrophobicity and smoothness. Following irradiation by green light at 530&#xa0;nm, complete inhibition of mold growth was observed at the end of two weeks at coating loadings above 0.2&#xa0;mg ml<sup>− 1</sup>. The photodynamic activity of the coating under visible light exposure was observed to be stable even after a period of 3 months. The coating developed here offers a viable solution for anti-mold applications under common lighting conditions.</p>

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Polysiloxane-consisting wood coating with photodynamic mold resistance

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Mrudul Velhal,
  • Abhishek Kumar,
  • Yaqoob Ali,
  • Amrutha Dinesh,
  • Shiren Wang,
  • Hong Liang

摘要

Mold is a common cause of degradation and decay of wood furniture and structures, leading to health risks and loss of aesthetics. Several coating methods have been developed to bestow mold resistance to wood surfaces. However, few studies have utilized photodynamic inactivation (PDI) as the mold inhibition mechanism for wood coatings. In this study, a polysiloxane-based coating incorporated with Rose Bengal Lactone (RBL) as a photosensitizer was developed on poplar woods at loadings of 0.1, 0.2, and 0.4 mg ml− 1. The polymeric coating was hydrophobic, with the highest water contact angle of 128.20° and demonstrated resistance to scratches during handling. The anti-mold performance was tested against the soft-rot fungus Chaetomium globosum. The polymer-coated wood samples were incubated with and without light irradiation. The dark cultures showed growth inhibition on the coated surface due to surface hydrophobicity and smoothness. Following irradiation by green light at 530 nm, complete inhibition of mold growth was observed at the end of two weeks at coating loadings above 0.2 mg ml− 1. The photodynamic activity of the coating under visible light exposure was observed to be stable even after a period of 3 months. The coating developed here offers a viable solution for anti-mold applications under common lighting conditions.