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Preparation of Photocatalytic Optically Transparent Coatings from Pigment Dispersions

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A series of thin pigment particle coatings was prepared by milling titania pigment (P25, Evonik Degussa) with different zirconia beads in butanol providing pigment particle dispersions, which enabled the deposition of optical coatings with haze below 2%, obtained from the total diffuse and total transmittance (DT/TT%) values of the coatings in the visible spectral range. P25 was used uncombined and combined with Ti(iOPr)4, nickel oxyhydroxide and NiO pigment, giving the P25, P25/TIP, P25/NiO x H y and P25/NiO coatings, respectively, which showed different photosuperhydrophylic (PSH) and photocatalytic (PCA) effects. PSH effect was determined from the contact angle (CA) measurements of water, which revealed that all the coatings showed a remarkable hydrophobic-to-hydrophilic conversion after 30 min of irradiation with UV light. PCA effect was studied using as model reaction the hydroxylation of terephthalic acid (TPA) to the highly fluorescent hydroxyterephthalic acid (HTPA), according to a procedure described. A simplified kinetic model that considers zero-order kinetics for the formation of HTPA from TPA revealed that the degradation rate constants (k 1) for the P25 and P25/TIP coatings were higher than for the P25/NiO x H y and P25/NiO coatings. All investigated coatings showed much stronger PSH and PCA effects compared to the Pilkington Activ Glass and only slightly higher haze.
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Document Type: Research Article

Publication date: December 1, 2014

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  • Journal of Surfaces and Interfaces of Materials (JSIM) is a multidisciplinary peer-reviewed international journal consolidating research activities in all experimental and theoretical aspects of surfaces and interfaces of materials, nanoscale engineering and manufacturing science into a single and unique reference source. This journal provides an international forum for scientists, engineers, biologists, researchers, and academicians working in the field of surface science and engineering, manufacturing science, processing technology and related applications.
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