title: Cold-Setting Inkjet Printed Titania Patterns Reinforced by Organosilicate Binder.
abstract: 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.
authors.affiliation: Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno 61600, Czech Republic. marcela.kralova@ceitec.vutbr.cz.
authors.forename: Marcela
authors.initials: M
authors.lastname: Králová
authors.affiliation: Faculty of Chemistry, Brno University of Technology, Purkynova 118, Brno 61200, Czech Republic. dzik@fch.vutbr.cz.
authors.forename: Petr
authors.initials: P
authors.lastname: Dzik
authors.affiliation: Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno 61600, Czech Republic. vit.kasparek@ceitec.vutbr.cz.
authors.forename: Vít
authors.initials: V
authors.lastname: Kašpárek
authors.affiliation: Faculty of Chemistry, Brno University of Technology, Purkynova 118, Brno 61200, Czech Republic. vesely-m@fch.vutbr.cz.
authors.forename: Michal
authors.initials: M
authors.lastname: Veselý
authors.affiliation: Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno 61600, Czech Republic. jaroslav.cihlar@ceitec.vutbr.cz.
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Cihlář
mesh_terms: D053758:Nanoparticles / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium
keywords: UV-curing; direct patterning; material printing; silica binder; titania