Self‐Cleaning and Antibacteric Ceramic Tile Surface

Niederhäusern, Simona De; Bondi, Moreno; Bondioli, Federica

doi:10.1111/j.1744-7402.2012.02801.x

Cited by 68 publications

(41 citation statements)

References 22 publications

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“…This also agrees with earlier observations by Liu et al [50] and Gogniat et al [38], which showed a loss of bacterial culturability after contact with TiO 2 nanoparticles in the dark. A study by de Niederhãusen and Bondi [51] on the self-cleaning of Ag-TiO 2 -coated ceramic tiles also showed significant antibacterial activity for 24 h in the dark.…”

Section: Stirring Experimentsmentioning

confidence: 99%

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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Abstract:In damp environments, indoor building materials are among the main proliferation substrates for microorganisms. Photocatalytic coatings, including nanoparticles of TiO 2 , could be a way to prevent microbial proliferation or, at least, to significantly reduce the amount of microorganisms that grow on indoor building materials. Previous works involving TiO 2 have already shown the inactivation of bacteria by the photocatalysis process. This paper studies the inactivation of Escherichia coli bacteria by photocatalysis involving TiO 2 nanoparticles alone or in transparent coatings (varnishes) and investigates different parameters that significantly influence the antibacterial activity. The antibacterial activity of TiO 2 was evaluated through two types of experiments under UV irradiation: (I) in slurry with physiological water (stirred suspension); and (II) in a drop deposited on a glass plate. The results confirmed the difference in antibacterial activity between simple drop-deposited inoculum and inoculum spread under a plastic film, which increased the probability of contact between TiO 2 and bacteria (forced contact). In addition, the major effect of the nature of the suspension on the photocatalytic disinfection ability was highlighted. Experiments were also carried out at the surface of transparent coatings formulated using nanoparticles of TiO 2 . The results showed significant antibacterial activities after 2 h and 4 h and suggested that improving the formulation would increase efficiency. OPEN ACCESSCoatings 2014, 4 671

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Section: Stirring Experimentsmentioning

confidence: 99%

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

et al. 2014

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“…Antimicrobial products can be formulated using biocides [21], metal oxide nanoparticles [22][23][24] or bio-based products [25]. A substantial amount of literature has been published on the effect of photocatalytic TiO 2 nanoparticles on microorganisms [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material

et al. 2018

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Abstract:Use of photocatalytic paint-like coatings may be a way to protect building materials from microbial colonization. Numerous studies have shown the antimicrobial efficiency of TiO 2 photocatalysis on various microorganisms. However, few have focused on easy-to-apply solutions and on photocatalysis under low irradiance. This paper focuses on (a) the antibacterial properties of a semi-transparent coating formulated using TiO 2 particles and (b) the microscopic investigations of bacterial biofilm development on TiO 2 -coated building materials under accelerated growth conditions. Results showed significant antibacterial activity after few hours of testing. The efficiency seemed limited by the confinement of the TiO 2 particles inside the coating binder. However, a pre-irradiation with UV light can improve efficiency. In addition, a significant effect against the formation of a bacterial biofilm was also observed. The epifluorescence approach, in which fluorescence is produced by reflect rather than transmitted light, could be applied in further studies of microbial growth on coatings and building materials.

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“…To confer self-cleaning properties to ceramic tiles, TiO 2 has been deposited as thin films on their surface [13][14][15]. Among the different methods used to prepare TiO 2 films [16][17][18][19], the sol-gel process is considered as one of the most promising alternatives because it presents a number of advantages, such as low sintering temperature, versatility of processing, and good homogeneity at low cost [12,15].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic properties of TiO2-functionalized tiles: influence of ceramic substrate

et al. 2014

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To confer self-cleaning properties to ceramic tiles through photocatalytic phenomena, TiO 2 is deposited as thin films on their surface. However, photocatalytic properties could be strongly influenced by physico-chemical characteristics of the ceramic support. For this reason, this investigation was aimed to study the influence of porosimetric characteristics of different ceramic tiles on adsorption and photocatalytic activity induced by deposited TiO 2 film in the presence of UV light. Experimental data in dark conditions showed that the porosity of the support strongly influenced the adsorption phenomenon of methylene blue (MB). Porosimetric characteristic of samples were tested by Hg intrusion. Higher porosity of the ceramic substrate increased the amount of MB adsorbed. On the contrary, photocatalytic tests have evidenced that a lower porosity of the support determined a higher MB discoloration rate. These results could be explained considering the MB internal diffusion phenomena limit the overall activity inside the porosimetric structure of functionalized tiles.

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Self‐Cleaning and Antibacteric Ceramic Tile Surface

Cited by 68 publications

References 22 publications

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Antibacterial Activity of TiO2 Photocatalyst Alone or in Coatings on E. coli: The Influence of Methodological Aspects

Bacterial Biofilm Characterization and Microscopic Evaluation of the Antibacterial Properties of a Photocatalytic Coating Protecting Building Material

Photocatalytic properties of TiO2-functionalized tiles: influence of ceramic substrate

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