Dependence of binder and photocatalyst in photocatalytically active printing ink
Konferenční objektOtevřený přístuppublishedDatum publikování
2013
Vedoucí práce
Oponent
Název časopisu
Název svazku
Vydavatel
Univerzita Pardubice
Abstrakt
Photocatalytically active printing ink changes its colour when exposed to UV light. The ink
is based on photocatalyst which decomposes organic dye in presence of UV light causing the changes in colour. Such process can be used as a simple UV dosimeter as its colour change depends on duration to UV light exposure. We have prepared such an ink based on redox dye 2,6-dichloroindophenol (DCIP), photocatalyst
titanium dioxide (nanodimensional anatase), reducing agent (glycerol) and two different water based binders – hydroxyethylcellulose (HEC) and polyvinyl alcohol (PVA). Prepared ink was applied onto a substrate, exposed to UV light and analysed by UV/Visible spectra. When the ink was exposed to UV light, the colour of the redox dye DCIP was changing from blue to colourless that belongs to the dihydro DCIP form. The colour change depends on several factors: on the amount of TiO2 and UV exposure, as well as on the type of binder. In this work the influence of two selected binders and the amount of photocatalyst on the properties of ink was observed. The results show that the ink based on polyvinyl alcohol has a greater initial absorption and absorbs at higher wavelength. Colour changes were faster when higher amount of photocatalyst and HEC as a binder were used. Nevertheless, it has been confirmed that both binders are appropriate for preparation of UV active functional printing inks.
Rozsah stran
p. 53-58
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Projekt
Zdrojový dokument
Vydavatelská verze
Přístup k e-verzi
open access
Název akce
XIth Symposium on Graphic Arts (17th to 18th June 2013, Pardubice, Czech Republic)
ISBN
978-80-7395-660-8 (Print)
978-80-7395-661-5 (Online)
978-80-7395-661-5 (Online)
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Klíčová slova
UV indicator dye, 2,6-dichloroindophenol, photocatalyst, hydroxyethylcellulose, polyvinyl alcohol