Radical Species Production and Color Change Behavior of Wood Surfaces Treated with Suppressed Photoactivity and Photoactive TiO2 Nanoparticles

Hernández, Vicente; Morales, Constanza; Sagredo, Nicole; Pérez-González, Gabriel; Romero, Romina; Contreras, David

doi:10.3390/coatings10111033

Cited by 6 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, the evaluation and analysis of the properties of the treated TiO 2 were relatively diverse. 25 Photocatalytic activity determined by the organic dye degradation experiments, 47 or the EPR test, 48 has been more commonly used for performance evaluation. However, when examining the weatherability of the substrates, TiO 2 not only functioned as a photocatalyst but also acted as a light absorber, which could not be determined by the degradation of the dye or by EPR testing alone.…”

Section: Acid Solubility and Weatherabilitymentioning

confidence: 99%

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications

Yang

Zhong

Tang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Surface modification is required for various applications of titanium dioxide (TiO 2 ) to suppress the photoactivity of TiO 2 . In this work, a composite SiO 2 /Al 2 O 3 film was successfully deposited onto TiO 2 particles by pulsed chemical vapor deposition. The composite film was particularly dense and uniform, as it was constituted by the 4.17 nm SiO 2 and 1.62 nm Al 2 O 3 amorphous films. The photocatalytic process with coated TiO 2 was investigated. The enhanced rate of carrier recombination in SiO 2 /Al 2 O 3coated TiO 2 was the main cause of inhibited photoactivity, which was mainly contributed by the inner SiO 2 film. TiO 2 /SiO 2 and TiO 2 /SiO 2 /Al 2 O 3 presented outstanding pigmentary properties. Compared to naked TiO 2 , TiO 2 /SiO 2 /Al 2 O 3 was more conducive to the weatherability of polyvinyl chloride and waterborne paints, owing to the suppressed photoactivity of the SiO 2 film and the increased optical absorption of the outer Al 2 O 3 film. The pulsed chemical vapor deposition showed promising industrial application potential for TiO 2 surface modification.

show abstract

Section: Acid Solubility and Weatherabilitymentioning

confidence: 99%

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications

Yang

Zhong

Tang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…This is probably due to the low photocatalytic oxidation capability of rutile TiO 2 , its strong UV absorption, and its high light scattering capability. However, Hernandez et al [ 101 ] reported that the photocatalytic activity of TiO 2 may be crucial for the performance of nanoparticles in the protection against UV radiation on wood surfaces.…”

Section: Thin Film Deposition Onto Wood Surfacesmentioning

confidence: 99%

Enhancing Weathering Resistance of Wood—A Review

Jirouš-Rajković

Miklečić

2021

Polymers

View full text Add to dashboard Cite

Wood is a truly sustainable and aesthetically pleasant material used in indoor and outdoor applications. Every material, including wood, is expected to have long-term durability and to retain its original appearance over time. One of the major disadvantages of wood is the deterioration of its surface when exposed outdoors, known as weathering. Although weathering is primarily a surface phenomenon, it is an important issue for wood products as it affects their appearance, service life, and wood-coating performance. To encourage the use of wood as a material for joinery and other building components, the results of research into increasing the weathering resistance of wood are extremely significant. The development of weathering protection methods is of great importance to reduce the maintenance requirements for wood exposed outdoors and can have a major environmental impact. There are various methods of protecting wood surfaces against weathering. This paper provides a literature survey on the recent research results in protecting wood from weathering. The topics covered include surface treatments of wood with photostabilizers; protection with coatings; the deposition of thin film onto wood surfaces; treatments of wood with inorganic metal compounds and bio-based water repellents; the chemical modification of wood; the modification of wood and wood surfaces with thermosetting resins, furfuryl alcohol, and DMDHEU; and the thermal modification of wood.

show abstract

“…More specifically, the holes and excited electrons that migrate to the surface of the nanoparticles when irradiated with UV may interact with the aromatic radicals caused by the UV degradation of lignin, interrupting further oxidative reaction with other wood's components, hence slowing color changes. Additional research is necessary to test this hypothesis [30].…”

Section: Introductionmentioning

confidence: 99%

Studies of the Photoprotection of Radiata Pine Wood Using Photocatalytic Nanoparticles

Hernández

Romero

Sagredo

et al. 2022

Forests

Self Cite

View full text Add to dashboard Cite

In this work, TiO2 and ZnO nanoparticles of different sizes and crystallographic configuration were used to protect wood surfaces against UV radiation. The sizes and levels of photoactivity of the nanoparticles were measured in vitro by transmittance electron microscopy and electron paramagnetic resonance spectroscopy, and then they were impregnated into radiata pine samples. The production of aromatic radicals, absorbance of UV and visible light, and chemical and color changes of treated and untreated wood surfaces were assessed after UV irradiation. Results show that nanoparticles that were less photoactive were better at reducing the production of organic radicals and the chemical and color changes on wood surfaces subjected to UV. Similarly, smaller nanoparticles (40 nm) were better at reducing photochemical reactions than larger (100 nm) nanoparticles. In terms of the crystallographic configuration of nanoparticles, differences in the production of phenoxy radicals were verified only for short-term exposure. Previous research revealed that certain levels of photoactivity in TiO2 nanoparticles may contribute to decreases in the photodegradation of wood surfaces possibly by an electron sink mechanism. Our observations indicate that this is unlikely to occur in the presence of highly photoactive nanoparticles.

show abstract

Radical Species Production and Color Change Behavior of Wood Surfaces Treated with Suppressed Photoactivity and Photoactive TiO2 Nanoparticles

Cited by 6 publications

References 33 publications

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications

Enhancing Weathering Resistance of Wood—A Review

Studies of the Photoprotection of Radiata Pine Wood Using Photocatalytic Nanoparticles

Contact Info

Product

Resources

About

Radical Species Production and Color Change Behavior of Wood Surfaces Treated with Suppressed Photoactivity and Photoactive TiO2 Nanoparticles

Cited by 6 publications

References 33 publications

Fabrication of SiO2/Al2O3 Composite-Coated TiO2 by Pulsed Chemical Vapor Deposition and Its Applications

Fabrication of SiO2/Al2O3 Composite-Coated TiO2 by Pulsed Chemical Vapor Deposition and Its Applications

Enhancing Weathering Resistance of Wood—A Review

Studies of the Photoprotection of Radiata Pine Wood Using Photocatalytic Nanoparticles

Contact Info

Product

Resources

About

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications

Fabrication of SiO₂/Al₂O₃ Composite-Coated TiO₂ by Pulsed Chemical Vapor Deposition and Its Applications