Coating methods for self-cleaning thick films of titania

Abstract

The present work provides a brief but wide ranging survey of the different methods that may be used to apply thick films of titanium dioxide for self-cleaning building materials. This survey is preceded by a general description of the photocatalytic applications of TiO 2 , a tabulated list of some relevant properties of the three naturally occurring polymorphs of TiO 2 and a tabulated survey of world market shares and resources of TiO 2 . The survey of coating technologies consists of succinct coverage of twenty potential periodic and continuous routes for the application of liquid borne suspensions of TiO 2 to building units. This coverage consists mainly of an illustration accompanied by relevant comments concerning the advantages and disadvantages of each method.

Photooxidation of Ammonia on TiO2 as a Source of NO and NO2 under Atmospheric Conditions

“…14 Likewise, there is interest in devising "selfcleaning" coatings for reducing both indoor and outdoor air pollution. 11,15 We show that uptake of atmospheric NH 3 onto surfaces containing TiO 2 is not a permanent removal process, as previously thought, but rather a photochemical route for generating reactive oxides of nitrogen that play a role in air pollution and are associated with significant health effects. 16,17 Nitrogen oxides, such as NO and NO 2 , are byproducts of combustion and precursors of ozone, nitric acid, and secondary organic aerosol.…”

“…In rural areas there has been interest in using TiO 2 -based photocatalytic devices to mitigate air emissions of odorous volatile organic compounds, hydrogen sulfide, and NH 3 from concentrated animal feed operations . Likewise, there is interest in devising “self-cleaning” coatings for reducing both indoor and outdoor air pollution. , We show that uptake of atmospheric NH 3 onto surfaces containing TiO 2 is not a permanent removal process, as previously thought, but rather a photochemical route for generating reactive oxides of nitrogen that play a role in air pollution and are associated with significant health effects. , …”

Plasma resistance of quartz with a glass coating layer by aerosol deposition

“…Previous studies reported that particles accelerated in the AD process collide with the substrate or the deposited coating layer, instantaneously releasing thermal energy [16,24]. In this way, the kinetic energy of the accelerated particles is converted into impact energy by colliding with the substrate and the formed coating layer.…”

“…The resultant coating layer is highly dense without the need for additional heat treatment, and possesses uniform and adequate adhesion between the substrate and the coating layer [11,15]. The advantages of using the AD method in this manner have led many researchers to focus on various ceramic materials such as Al 2 O 3 , Y 2 O 3 , lead zirconate titanate (PZT), or BaTiO 3 for plasma resistance or electrical properties [5,[11][12][13][14][15][16][17]. However, few studies investigated the use of glass powders with the AD method.…”

TiO2 Films for Self‐Detection and Decontamination

“…International Journal of Photoenergy paints for self-cleansing and microbial destruction [6], and Abdullah et al reported on the advantages and disadvantages of coating methods (dip coating, splatter coating, static brush coating, etc.) for various TiO 2 for self-cleaning applications [7]. Other popular applications include the incorporation of photocatalytic semiconductor particles in textiles.…”