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Materials 2013, 6(8), 3270-3283; doi:10.3390/ma6083270
Article

Bactericidal Activity of Aqueous Acrylic Paint Dispersion for Wooden Substrates Based on TiO2 Nanoparticles Activated by Fluorescent Light

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Received: 6 May 2013 / Revised: 14 June 2013 / Accepted: 19 July 2013 / Published: 2 August 2013
(This article belongs to the Special Issue Biointerfaces and Materials)
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Abstract

The photocatalytic effect of TiO2 has great potential for the disinfection of surfaces. Most studies reported in the literature use UV activation of TiO2, while visible light has been used only in a few applications. In these studies, high concentrations of TiO2, which can compromise surface properties, have been used. In this work, we have developed an acrylic-water paint dispersion containing low TiO2 content (2 vol %) for the inactivation of microorganisms involved in hospital-acquired infections. The nanoparticles and the coating have been characterized using spectroscopic techniques and transmission electron microscopy, showing their homogenous dispersion in the acrylic urethane coating. A common fluorescent light source was used to activate the photocatalytic activity of TiO2. The paint dispersion showed antimicrobial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The coating containing the TiO2 nanoparticles maintained good UV stability, strong adhesion to the substrate and high hardness. Therefore, the approach used is feasible for paint formulation aimed at disinfection of healthcare surfaces.
Keywords: anatase aqueous dispersion; photocatalytic activity; titanium dioxide; fluorescent light; antimicrobial activity anatase aqueous dispersion; photocatalytic activity; titanium dioxide; fluorescent light; antimicrobial activity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zuccheri, T.; Colonna, M.; Stefanini, I.; Santini, C.; Gioia, D.D. Bactericidal Activity of Aqueous Acrylic Paint Dispersion for Wooden Substrates Based on TiO2 Nanoparticles Activated by Fluorescent Light. Materials 2013, 6, 3270-3283.

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