Journal ArticleDOI
Quantitative Evaluation of the Photoinduced Hydrophilic Conversion Properties of TiO2 Thin Film Surfaces by the Reciprocal of Contact Angle
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TLDR
In this article, the relationship between the reciprocal of the contact angle and the reconstruction of the surface hydroxyl groups was examined and it was shown that the reciprocal correspond to the density of the surfaces reconstructed by UV irradiation.Abstract:
Kinetics on the photoinduced hydrophilic conversion processes of the TiO2 surface was investigated. First, we show that there exist linear relationships between the reciprocal of the contact angle and the UV irradiation time and use the slope of this straight line as the hydrophilic conversion rate, which is independent of the initial value of the contact angle. Second, we examine the relationships between the reciprocal of the contact angle and the reconstruction of the surface hydroxyl groups and show that the reciprocal of the contact angle corresponds to the density of the surface hydroxyl groups reconstructed by UV irradiation. Finally, the dependence of the hydrophilic conversion on various parameters such as the incident UV intensity, the wavelength of irradiated light, and the concentration of the hole scavenger are quantitatively investigated with the proposed hydrophilic conversion rate. These results show that the photoinduced hydrophilic conversion proceeds competitively with the photocatalyti...read more
Citations
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Journal ArticleDOI
TiO2 photocatalysis and related surface phenomena
TL;DR: The field of photocatalysis can be traced back more than 80 years to early observations of the chalking of titania-based paints and to studies of the darkening of metal oxides in contact with organic compounds in sunlight as discussed by the authors.
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TiO2 Photocatalysis: A Historical Overview and Future Prospects
TL;DR: In this paper, the progress of the scientific research on TiO2 photocatalysis as well as its industrial applications are reviewed, and future prospects of this field mainly based on the present authors' work.
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Surface Science Studies of the Photoactivation of TiO2New Photochemical Processes
Tracy L. Thompson,John T. Yates +1 more
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A surface science perspective on TiO2 photocatalysis
TL;DR: The field of surface science provides a unique approach to understand bulk, surface and interfacial phenomena occurring during TiO2 photocatalysis as mentioned in this paper, including photon absorption, charge transport and trapping, electron transfer dynamics, adsorbed state, mechanisms, poisons and promoters, and phase and form.
Journal ArticleDOI
Titanium dioxide photocatalysis: present situation and future approaches
Akira Fujishima,Xintong Zhang +1 more
TL;DR: Fujishima et al. as mentioned in this paper summarized the present commercialization of TiO2-based products and highlighted several points for the future development of the material for photocatalysis.
References
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Titanium dioxide photocatalysis
TL;DR: A review of the current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy is discussed in this paper.
Journal ArticleDOI
An Essay on the Cohesion of Fluids
TL;DR: In this article, it has been shown that for each combination of a solid and a fluid, there is an appropriate angle of contact between the surfaces of the fluid, exposed to the air, and to the solid.