Tunable Assembly of Photocatalytic Colloidal Coatings for Antibacterial Applications
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2024-09-13
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
ACS Applied Polymer Materials, Volume 6, issue 17, pp. 10298-10310
Abstract
In this study, evaporation-induced size segregation and interparticle interactions are harnessed to tune the microstructure of photocatalytic colloidal coatings containing TiO2 nanoparticles and polymer particles. This enabled the fabrication of a library of five distinct microstructures: TiO2-on-top stratification, a thin top layer of polymer or TiO2, homogeneous films of raspberry particles, and a sandwich structure. The photocatalytic and antibacterial activities of the coatings were evaluated by testing the viability of Methicillin-resistant Staphylococcus aureus (MRSA) bacteria using the ISO-27447 protocol, showing a strong correlation with the microstructure. UVA irradiation for 4 h induces a reduction in MRSA viability in all coating systems, ranging from 0.6 to 1.1 log. Films with TiO2-enriched top surfaces exhibit better resistance to prolonged exposure to disinfection and bacterial testing. The remaining systems, nonetheless, present higher antibacterial activity because of a larger number of pores and coating defects that enhance light and water accessibility for the generation and transport of reactive oxygen species. This work establishes design rules for photocatalytic coatings based on the interplay between performance and film architecture, offering valuable insights for several applications, including antibacterial surfaces, self-cleaning/antifogging applications, and water purification.Description
Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
Keywords
antibacterial, coatings, colloids, photocatalysis, self-assembly, stratification, titanium dioxide
Other note
Citation
Sofroniou, C, Scacchi, A, Le, H, Espinosa Rodriguez, E, D’Agosto, F, Lansalot, M, Dunlop, P S M, Ternan, N G & Martín-Fabiani, I 2024, ' Tunable Assembly of Photocatalytic Colloidal Coatings for Antibacterial Applications ', ACS Applied Polymer Materials, vol. 6, no. 17, pp. 10298-10310 . https://doi.org/10.1021/acsapm.4c01436