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Photocatalytic properties of hybrid titania-silica layers
Zbořilová, Zdeňka ; Pekárková, Jana (referee) ; Dzik, Petr (advisor)
This diploma thesis is focused on the preparation of hybrid titania-silica layers. Titanium tetraisopropoxide and tetraethyl orthosilicate with Levasil were used as the precursors for TiO2 and SiO2 synthesis, respectively. The layers were deposited on substrates by material printing. Furthermore, this work is focused on study of the photocatalytic activity of prepared titania/silica hybrid layers. Photocatalytic activity of prepared layers was studied by measuring the oxidation of 2,6-dichlorindofenolu, oxidative degradation of stearic acid and oxidation of terephthalic acid. The influence of hybrid layers number on the photocatalytic activity was investigated.
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Porous layers of titanium dioxide
Sekerová, Kateřina ; Dvonka, Vladimír (referee) ; Dzik, Petr (advisor)
This thesis deals with the preparation, properties and methods of characterization of porous titanium oxide layers prepared by sol-gel process. The theoretical part contains a summary of the search methods of preparation and use of porous thin films of titanium dioxide photocatalysis. The practical part involves the preparation of sol suitable for printing of porous layers, the properties and characterization of these layers.
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Microfluidic models of cell membranes
Haluzová, Kateřina ; Dzik, Petr (referee) ; Pekař, Miloslav (advisor)
This work deals with artificial cellular membrane models, their various types, production and usage. It also summarises basic matherials for production of microfluidic chips. Experimental part is focused on optimalization of production of polydimethylsiloxane chip suitable for free-standing lipid bilayers. A preparation workflow was developed which includes casting on a silicon wafer, removing bubbles from the PDMS, curing it at 80 °C for 1 h, plasma bonding, annealing at 150 °C for 30 min and storage. Using fluorescence microscopy, the prepared chips were found to be strong and sealed.
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Photocatalytic activity of titania multilayer printed structures
Potočková, Lucie ; Pekárková, Jana (referee) ; Dzik, Petr (advisor)
This thesis deals with the preparation of titanium dioxide films by the sol-gel process. Films were deposited by material printing on soda-lime glass plates. The thickness of layers was directed by repeated printing. Thus were prepared multi-layered TiO2 coatings. The surface topology of films was investigated by optical microscopy and scanning electron microscopy. The photocatalytic activity of these coatings was studied on a model compound 2,6-dichlorineindophenol. The influence of the number of TiO2 layers and the intensity of UV irradiation on the size of 2,6-dichlorineindophenol degradation rate constant was monitored. The photo-induced hydrophilic properties of prepared coatings were studied as well.
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Methods of Color Prints Lightfastness Evaluation
Komárková, Hana ; Havlínová,, Bohuslava (referee) ; Dzik, Petr (advisor)
This bachelor thesis deals with recent methods of lightfastness evaluation of the colour photographs. It summarizes the experimental methods used for both classic and digitally printed materials. Samples made by using the dye diffusion thermal transfer were put to accelerated and long-term lightfastness tests. Colour changes of the samples were evaluated on the basis of measured reflective spectra from which colorimetric quantities were calculated. The velocity constant of photograph fading was specified by dependence on the loss of normalized gamut volume on the exposure.
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Synthesis and propersties of organo-silicate binders for titania nanoparticulate layers
Svoboda, Tomáš ; Cihlář, Jaroslav (referee) ; Dzik, Petr (advisor)
This diploma thesis deals with the synthesis of an organosilica polymer which could be used as a binder for titanium dioxide photocatalytic layers. The main reason for incorporating the binder into the photocatalytic layers is not only the improving of the mechanical properties, but above all, the binder could help with production of low-temperature photocatalytic layers, that could be applied to heat-sensitive materials such as plastic materials. This could create layers on flexible materials that could be easily made into any shape. The work focuses on the synthesis of organosilica polymer from the organosilica precursor and subsequent characterization of the binder. Surface tension, viscosity, density, XRD, thermal analysis of silica binder solutions was performed. Titanium dioxide compositions with this binder were prepared, then they were printed and the layers were treated with UV and plasma. Treated layers were examined by FT-IR and a voltamperometric characterization was performed.
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Fabrication of conducting patterns by material electroless plating of printed precursor
Kováčová, Silvia ; Gemeiner,, Pavol (referee) ; Dzik, Petr (advisor)
The subject of this diploma thesis is the preparation of conductive structures by electroless plating of an extruded precursor. The experimental part deals with the preparation of standard patterns based on the length of immersion time in a coppering bath. The precursor layers were applied with Fujifilm Dimatix to various receiver substrates. The individual substrates with the precursor layer were immersed in the copper solution within different time intervals. The structure of the layers of grown copper and their thickness was characterized by a profilometer.
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Fabrication of conductive paths by electroless plating of printed precursors
Kováčová, Silvia ; Zita, Jiří (referee) ; Dzik, Petr (advisor)
The subject of this bachelor thesis is the preparation of conductive tracks by electroless plating of printed precursors. The experimental part deals with the preparation of standard samples based on the length of immersion time in the coppering bath. The precursor layers were applied with a technical pen to ceramic corundum substrates. The individual precursor layer substrates were immersed in the coppering bath in various time intervals. The structure of the grown copper layers was observed by an optical microscope and their thickness was determined by a profilometer.
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Fabrication of titania mesoporous layers by material printing
Schovancová, Petra ; Drbohlavová, Jana (referee) ; Dzik, Petr (advisor)
This diploma thesis was focused on the preparation of mesoporous titanium dioxide layers. Mesoporous layers were prepared from titanium tetraisopropoxide as a precursor with addition diethanolamine and polyethylene glycol. These layers were deposited by material printing. This work was also focused on the characterisation of prepared layers. Hydrophilicity of titanium dioxide layers were studied. The photocatalytic activity of the printed titanium layers was tested by the photocatalytic degradation of stearic acid. Bang-gap studies were performed. Quality of prepared layers was inspected by optical microscopy, scanning electron microscopy and atomic force microscopy.
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