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/s0040-6090(99)00205-9

Cited by 555 publications

(242 citation statements)

References 12 publications

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“…En 1995, se descubrió accidentalmente que los recubrimientos de TiO 2 que contenían un cierto porcentaje de sílice (SiO 2 ) desarrollaban un comportamiento hidrofílico cuando se encontraban en contacto con el agua y expuestos a luz UV (16)(17). Lo anterior se debe a que las moléculas de agua parecen tender a formar enlaces de hidrógeno con los grupos OH -, los cuales son generados durante la exposición del TiO 2 a la luz UV.…”

Section: Titanium Dioxide Photocatalysisunclassified

“…In 1995, it was found by accident that TiO 2 films containing a certain percentage of silica (SiO 2 ) developed a hydrophilic behaviour when they were in contact with water and exposed to UV light (16)(17). This because water molecules seems to be prone to form hydrogen bounds with OH -groups which are generated during exposure of TiO 2 to UV light.…”

Section: Titanium Dioxide Photocatalysismentioning

confidence: 99%

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Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Maury¹,

Belie²

2010

Mater. construcc.

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RESUMENDebido a las características físico-químicas de los materiales a base de cemento, la calidad estética de estos materiales tiende a disminuir con facilidad. Por otra parte, la actividad fotocatalítica producida por los materiales a base de cemento que contienen TiO 2 , ha permitido incorporar recientemente en estos materiales propiedades de auto-limpieza y purificación del aire. Sin embargo, actualmente sólo existe en el mercado un número limitado de dichos materiales, dado que aún se necesita conocer mejor las mencionadas propiedades. Para mejorar esta situación, se vienen desarrollando ensayos no estandarizados donde se evalúa la foto-degradación de colorantes orgánicos producida por los diferentes materiales. Por tanto, se han producido una gran cantidad de resultados no fácilmente comparables entre sí. Este artículo presenta una descripción de los diferentes ensayos de laboratorio desarrollados, así como una evaluación del potencial de auto-limpieza de los primeros edificios que contienen TiO 2 . Finalmente, se identifican los futuros desafíos de investigación en este campo.Palabras clave: dióxido de titanio, fotocatálisis, autolimpieza, materiales a base de cemento, colorantes orgá-nicos. SUMMARYDue to the physico-chemical characteristics of cementitious materials the aesthetic quality of these materials tend to decrease easily. On the other hand, the photocatalytic activity produced by TiO 2 loaded cementitious materials have recently allowed them to include self-cleaning and air-purifying properties. However, because a better understanding of these properties is still needed, only a limited number of these materials is present in the construction market. As a strategy to improve this situation, non standards tests based on photodegradation of organic dyes have become widely used to evaluate the photocatalytic action of the different materials. Today, a wide spectrum of non easily comparable results have been produced. In order to improve this situation, this paper focuses on the description of the developed laboratory tests as well as on the evaluation of the self-cleaning potential of the first buildings containing TiO 2 . Finally, future research challenges in this field are identified.K Ke ey yw wo or rd ds s: : titanium dioxide, photocatalysis, self-cleaning, cementitious materials, organic dyes.( * ) Ghent University, Gante, Bélgica.Persona de contacto/Corresponding author: Nele.DeBelie@UGent.be INTRODUCCIÓNLos materiales a base de cemento, especialmente aquellos expuestos a la intemperie, presentan un proceso de deterioro acelerado debido a la exposición continua y directa a muchos contaminantes atmosféricos (orgánicos, inorgánicos y material en partículas) y a diferentes tipos de micro-organismos (tales como algas, hongos y cyanobacterias). A lo anterior, se le suman los cambios frecuentes en las condiciones ambientales a los que están sometidos. Esta situación puede producir, en muchos casos, importantes cambios en las propiedades de los materiales, especialmente en las propiedades estéticas...

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Section: Titanium Dioxide Photocatalysisunclassified

Section: Titanium Dioxide Photocatalysismentioning

confidence: 99%

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Maury¹,

Belie²

2010

Mater. construcc.

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“…One important function of the anatase and rutile layers is to provide "self-cleaning" properties to the glass surface. 7,8 This interesting property is derived from the catalytic ability of anatase in particular to degrade adsorbed hydrocarbon molecules combined with the photoinduced hydrophilicity of the surface, which allows wetting of the surface by a water layer. This hydrophilicity prevents water droplet formation providing an antifogging property to the glass.…”

Section: Introductionmentioning

confidence: 99%

Surface and interstitial transition barriers in rutile (110) surface growth

et al. 2009

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We present calculated surface and interstitial transition barriers for Ti, O, O-2, TiO, and TiO2 atoms and clusters at the rutile (110) surface. Defect structures involving these small clusters, including adcluster and interstitial binding sites, were calculated by energy minimization using density-functional theory (DFT). Transition energies between these defect sites were calculated using the NEB method. Additionally, a modified SMB-Q charge equilibration empirical potential and a fixed-charge empirical potential were used for a comparison of the transition energy barriers. Barriers of 1.2-3.5 eV were found for all studied small cluster transitions upon the surface except for transitions involving O-2. By contrast, the O-2 diffusion barriers along the [001] direction upon the surface are only 0.13 eV. The QEq charge equilibration model gave mixed agreement with the DFT calculations, with the barriers ranging between 0.8 and 5.8 eV

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“…In the last decade, titanium dioxide has also attracted a great deal of interest due to its photocatalytic behavior [4,5]. The decomposition of organic compounds on the surface of TiO 2 and the reduction of the contact angle between water and the surface of TiO 2 under UV irradiation results in selfcleaning and anti-fogging effects [6]. It is well known that titania exhibits three distinct crystalline forms apart from the amorphous form: an orthorhombic one, the brookite and two tetragonal phases, the anatase and the rutile [7,8].…”

Section: Introductionmentioning

confidence: 99%

Surface Morphological and Electrical Properties of Sputtered Tio2 Thin Films

Thaidun¹

2013

IOSR-JAP

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Photocatalytic activity and photoinduced hydrophilicity of titanium dioxide coated glass

Cited by 555 publications

References 12 publications

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Surface and interstitial transition barriers in rutile (110) surface growth

Surface Morphological and Electrical Properties of Sputtered Tio2 Thin Films

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