In this section
@article{Kafizas:2009:10.1039/b905222d,
author = {Kafizas, A and Adriaens, D and Mills, A and Parkin, IP},
doi = {10.1039/b905222d},
journal = {Physical Chemistry Chemical Physics},
pages = {8367--8367},
title = {Simple method for the rapid simultaneous screening of photocatalytic activity over multiple positions of self-cleaning films.},
url = {http://dx.doi.org/10.1039/b905222d},
volume = {11},
year = {2009}
}
TY - JOUR
AB - An intelligent ink, previously shown to be capable of rapidly assessing photocatalytic activity, was simply applied via a felt-pen onto a commercially available piece of Activ self-cleaning glass. The ink, comprising of redox dye resazurin and the sacrificial electron donor glycerol within an aqueous hydroxy ethyl cellulose (HEC) polymer media, was photocatalytically degraded in a two-step process. The key initial stage was the photo-reductive conversion of resazurin to resorufin, whereby a colour change from blue to pink occurred. The latter stage was the subsequent photo-reduction of the resorufin, where a slower change from pink to colourless was seen. Red and green components of red-green-blue colour extracted from flat-bed scanner digital images of resazurin ink coated photocatalytic films at intervals during the photocatalysis reaction were inversely proportional to the changes seen via UV-visible absorption spectroscopy and indicative of reaction kinetics. A 3 x 3 grid of intelligent ink was drawn onto a piece of Activ and a glass blank. The photocatalysis reaction was monitored solely by flat-bed digital scanning. Red-green-blue values of respective positions on the grid were extracted using a custom-built program entitled RGB Extractor. The program was capable of extracting a number of 5 x 5 pixel averages of red-green-blue components simultaneously. Allocation of merely three coordinates allowed for the automatic generation of a grid, with scroll-bars controlling the number of positions to be extracted on the grid formed. No significant change in red and green components for any position on the glass blank was observed; however, the Activ film displayed a homogenous photo-reduction of the dye, reaching maxima in red and minima in green components in 23 +/- 3 and 14 +/- 2 min, respectively. A compositionally graded N-doped titania film synthesised in house via a combinatorial APCVD reaction was also photocatalytically tested by this method where 247 positio
AU - Kafizas,A
AU - Adriaens,D
AU - Mills,A
AU - Parkin,IP
DO - 10.1039/b905222d
EP - 8367
PY - 2009///
SN - 1463-9076
SP - 8367
TI - Simple method for the rapid simultaneous screening of photocatalytic activity over multiple positions of self-cleaning films.
T2 - Physical Chemistry Chemical Physics
UR - http://dx.doi.org/10.1039/b905222d
VL - 11
ER -
Dr. Andreas Kafizas
Leader - Solar Coatings Group
e-mail: a.kafizas@imperial.ac.uk
tel: +44(0)20 7594 6752
twitter: @CoatingsSolar