title: Assessment of the activity of photocatalytic paint using a simple smart ink designed for high activity surfaces.
abstract: The use of an acid violet 7 (AV7) smart ink to assess the activity of photocatalytic paint is demonstrated. A linear correlation is established between the change in oxidized dye concentration, as measured by diffuse reflectance, and the change in the green component of the RGB color values, obtained using a portable hand-held scanner, suggesting that such tests can be monitored easily using an inexpensive piece of hand-held office equipment, as opposed to an expensive lab-based instrument, such as a diffuse reflectance UV/vis spectrophotometer. The bleaching of the AV7 follows first order kinetics, at a rate that is linearly dependent upon the UVA irradiance (0.30-3.26 mW cm(-2)). A comparison of relative rate of bleaching of the AV7 ink with the relative rate of removal of NOx, as determined using the ISO test (ISO 22197-1:2007), established a linear relationship between the two sets of results and the relevance of this correlation is discussed briefly.
authors: School of Chemistry and Chemical Engineering, Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, United Kingdom.
authors: Andrew
authors: A
authors: Mills
authors: Christopher
authors: C
authors: O'Rourke
authors: Katherine
authors: K
authors: Lawrie
authors: Sofia
authors: S
authors: Elouali