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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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Characterization of plasma activated water for biomedical applications
Šindelková, Kateřina ; Dzik, Petr (referee) ; Kozáková, Zdenka (advisor)
The aim of this master thesis is to characterize plasma activated water (PAW) prepared in various plasma systems using direct and indirect interaction of plasma with liquid or its surface. Plasma was generated by electric discharges at atmospheric pressure. The prepared plasma-activated water was studied with respect to its use in biomedical applications. The theoretical part deals with plasma activated water. It contains a description of the PAW preparation, its characterization in terms of produced particles or its physico-chemical properties. Also, methods for antimicrobial activity estimation or colorimetric determination of produced particles are described in this section. In the experimental part of this work, the types of discharges that were used for the PAW preparation and their comparison are presented. Two types of liquids were selected for the activation, namely distilled and tap water. Subsequently, concentrations of selected reactive particles in PAW (hydrogen peroxide, nitrates and nitrites) produced in three different plasma systems were determined. Besides the comparison of reactive particles production in various systems, their time stability was studied as well. Over time after the PAW preparation, the values of active particles concentrations have changed due to mutual interactions between the particles. Mainly, nitrites were oxidized to nitrates or vice versa depending on the PAW type and other conditions. Part of the work was also monitoring selected physical properties of PAW, namely pH value and specific conductivity. It has been found that PAW does not retain its activated properties for too long, depending on the type of preparation and methods of storage. Therefore, one of the important goals of this work was to determine and compare suitable storage conditions for PAW with respect to its potential biomedical applications.
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