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Optical Properties of Titania Coatings Prepared by Inkjet Direct Patterning of a Reverse Micelles Sol-Gel Composition
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Molecules 2015, 20(9), 16582-16603;

Cold-Setting Inkjet Printed Titania Patterns Reinforced by Organosilicate Binder

Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno 61600, Czech Republic
Faculty of Chemistry, Brno University of Technology, Purkynova 118, Brno 61200, Czech Republic
Author to whom correspondence should be addressed.
Academic Editors: Wing-Kei Ho and Jimmy C. Yu
Received: 8 June 2015 / Revised: 20 August 2015 / Accepted: 24 August 2015 / Published: 11 September 2015
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A hybrid organo-silica sol was used as a binder for reinforcing of commercial titanium dioxide nanoparticles (Evonic P25) deposited on glass substrates. The organo-silica binder was prepared by the sol-gel process and mixtures of titania nanoparticles with the binder in various ratios were deposited by materials printing technique. Patterns with both positive and negative features down to 100 µm size and variable thickness were reliably printed by Fujifilm Dimatix inkjet printer. All prepared films well adhered onto substrates, however further post-printing treatment proved to be necessary in order to improve their reactivity. The influence of UV radiation as well as of thermal sintering on the final electrochemical and photocatalytic properties was investigated. A mixture containing 63 wt % of titania delivered a balanced compromise of mechanical stability, generated photocurrent density and photocatalytic activity. Although the heat treated samples yielded generally higher photocurrent, higher photocatalytic activity towards model aqueous pollutant was observed in the case of UV cured samples because of their superhydrophilic properties. While heat sintering remains the superior processing method for inorganic substrates, UV-curing provides a sound treatment option for heat sensitive ones. View Full-Text
Keywords: titania; silica binder; material printing; direct patterning; UV-curing titania; silica binder; material printing; direct patterning; UV-curing

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Králová, M.; Dzik, P.; Kašpárek, V.; Veselý, M.; Cihlář, J. Cold-Setting Inkjet Printed Titania Patterns Reinforced by Organosilicate Binder. Molecules 2015, 20, 16582-16603.

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