Photocatalytic activity and photoinduced hydrophilicity of titanium dioxide coated glass

Watanabe, Toshiya; Nakajima, Akira; Wang, R.; Minabe, Masahiro; Koizumi, Shinichi; Fujishima, Akira; Hashimoto, Kazuhito

doi:10.1016/b978-044450247-6.50076-x

Cited by 27 publications

(31 citation statements)

References 12 publications

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“…DNAPL was injected into one of the vertical fractures at a rate of 2.9 ml/min using a peristaltic pump. Fractures were of uniform aperture (0.2 mm) and constant width (2 cm), and were made hydrophilic by coating with TiO 2 followed by exposure to ultraviolet rays [ Watanabe et al , 1999]. Water (ρ = 0.998 g/ml, μ = 1.000 cP at 25°C) and TCE (ρ = 1.464 g/ml, μ = 0.576 cP at 25°C) formed the groundwater and DNAPL, respectively.…”

Section: Methodsmentioning

confidence: 99%

Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations

Yeo

Lee

et al. 2003

Geophysical Research Letters

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[1] We consider the influence of ambient groundwater flow on the migration of DNAPL within a fracture network. In context of a modified invasion percolation (MIP) growth algorithm, we formulate a mechanistic model that includes capillary and gravity forces as well as viscous forces within the DNAPL and the ambient groundwater. The MIP model is verified against laboratory experiments, which show good agreement in DNAPL migration path through a two-dimensional fracture network. The results of both simulations and laboratory experiments suggest that ambient groundwater flow can be a significant factor controlling DNAPL migration path, velocity, and channeling pattern in a fracture network.

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Section: Methodsmentioning

confidence: 99%

Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations

Yeo

Lee

et al. 2003

Geophysical Research Letters

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“…TiO 2 can be used to degrade and mineralize a large variety of environmental contaminants, including organic and inorganic pollutants into water, carbon dioxide, and simple inorganic anions (Lan and others ). Also, a TiO 2 ‐coated surface becomes superhydrophilic upon exposure to UV light due to the formation of metastable hydroxyl groups which results in the creation of a thin liquid layer characterized by a small contact angle (Watanabe and others ). This functionality is reversible, and it depends on the light exposure (Wolfrum and others ).…”

Section: Introductionmentioning

confidence: 99%

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Yemmireddy

Hung

2017

Comp Rev Food Sci Food Safe

138

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Cross-contamination of foods with pathogenic microorganisms such as bacteria, viruses, and parasites may occur at any point in the farm to fork continuum. Food contact and nonfood contact surfaces are the most frequent source of microbial cross-contamination. In the wake of new and emerging food safety challenges, including antibioticresistant human pathogens, conventional sanitation and disinfection practices may not be sufficient to ensure safe food processing, proper preparation, and also not be environmentally friendly. Nanotechnology-enabled novel food safety interventions have a great potential to mitigate the risk of microbial cross-contamination in the food chain. Especially engineered nanoparticles (ENPs) are increasingly finding novel applications as antimicrobial agents. Among various ENPs, photocatalyst metal oxides have shown great promise as effective nontargeted disinfectants over a wide range of microorganisms. The present review provides an overview of antimicrobial properties of various photocatalyst metal oxides and their potential applications as surface coatings. Further, this review discusses the most common approaches to developing antimicrobial coatings, methods to characterize, test, and evaluate antimicrobial efficacy as well as the physical stability of the coatings. Finally, regulations and challenges concerning the use of these novel photocatalytic antimicrobial coatings are also discussed.

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“…Since the water splitting phenomenon on TiO2 electrode was first discovered by Fujishima in 1972 3 , TiO2 has attracted intensive interests for its potential applications in photocatalysis 4,5 , environmental protection 6 , sensors 7 and solar cells 8,9 owing to the advantages on photocatalytic performance, chemical stability and production cost. A variety of techniques have been used to prepare TiO2 thin films including chemical vapor deposition (CVD) 10 , sol-gel approaches [11][12] , gold-assisted electrochemical etching 13 , pulse laser deposition 14 , sputtering 15,16 , electrochemical anodization 17 . These procedures usually need rigid environments, complicated processes or expensive vessels.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of ultra-smooth TiO2 thin films with superhydrophilicity

Lai

Yong

2018

Int J Innov Educ Res

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Functional TiO2 films were fabricated on glass substrates by using modified dip coating method. The properties of the films including crystal structures, thickness, surface morphology and optical properties were studied. The film coated once possessed an ultra-smooth surface with a root mean square (RMS) roughness of 2.6 ± 0.7 nm, which was attributed to the effect of N2 flow during the formation of film. The TiO2 films exhibited superhydrophilicity without UV illumination and the superhydrophilic performance was enhanced with the increase of film thickness. Tests on degradation of dyes under UV illumination indicated that the annealing temperature and thickness of the TiO2 films accounted for their photocatalytic performance. An increase of annealing temperature led to a decrease of the amount of defects and the recombination rate of electron-hole pairs. Because of change of film thickness, light absorption and amount of defects of the TiO2 films influenced photocatalytic performance simultaneously.

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Photocatalytic activity and photoinduced hydrophilicity of titanium dioxide coated glass

Cited by 27 publications

References 12 publications

Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations

Influence of ambient groundwater flow on DNAPL migration in a fracture network: Experiments and simulations

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Synthesis and photocatalytic properties of ultra-smooth TiO2 thin films with superhydrophilicity

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