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Photocatalytic properties of hybrid titania-silica layers
Sekerová, Kateřina ; Drbohlavová, 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 the study of the rheological properties of TiO2-SiO2 sol and characterization of prepared films by XRD, SEM, ellipsometry, AFM, pencil hardnes test, optical microscopy. Optical properties were also characterized by transmitance and reflectance measurement and the functionality of these layers was demonstrated by a stearic acid degradation experiment.
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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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Photocatalytic inactivation of yeast in flow reactor
Lipenská, Michaela ; Drbohlavová, Jana (referee) ; Veselá, Mária (advisor)
This diploma thesis focuses on the photocatalytic effect of titanium dioxide and ultraviolet light. Theoretical part shows the effect of titanium dioxide and aplication in various branches. Antibacterial effect of titanium dioxide iluminated by ultraviolet light was observed in the flow tube reactor on the yeast Hansenula anomala. After adjusting the optimal flow rate experimented with different inicial concentration of yeast cells. To increase desired effect also silver was used in the photocatalytic system. As observed in many previous studies, silver decreases the time needed for killing the microorganisms. The optained date were analysed.
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Optical sensor for UV radiation
Třešňáková, Andrea ; Drbohlavová, Jana (referee) ; Veselý, Michal (advisor)
This bachelor thesis deals with monitoring of photocatalytic activity on prepared optical sensors for UV illumination. A polymeric matrix was prepared based on the redox dye Acid Red 1, titanium dioxide and calibration agents. The deposition of matrix was done by material printing – roll-to-roll printer – on PET film. This resulted in optical dosimeter for UV illumination. Finally, the validity of the reciprocity law was proved.
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Titania suspensions for material printing
Svoboda, Tomáš ; Drbohlavová, Jana (referee) ; Dzik, Petr (advisor)
This bachelor‘s thesis deals with the preparation of stable suspensions of titanium dioxide applicable for material printing. A wide range of dispersive environments stabilizing the nanoparticles of titanium dioxide was investigated. Commercially available aqueous dispersion and dry titania powder was used as the source of TiO2.The properties of prepared suspensions were evaluated and the most suitable suspension was used for material printing. This thesis focused on suspension‘s stability, sizes of particles dispersed in them, and in their rheological behavior. Furthermore, we analyzed the studied the properties of printed layers by SEM, optical microscopy, DLS and analytical centrifuge. We also evaluated the photocatalytic activity by monitoring the oxidation rate of coumarin to 7-hydroxycoumarin.
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Monitoring of photocatalytic activity using redox dyes
Uhrová, Ivana ; Drbohlavová, Jana (referee) ; Veselý, Michal (advisor)
The bachelor thesis deals with assessment of photocatalytic activity of titanium dioxide. The easiest and simultaneously the quickest way is bleaching of indicator ink based on redox dye. The theoretical part contains characteristics of several similar dyes and a description of ink-structure effect on total bleaching speed. The experimental part elaborately describes bleaching of indicator ink based on redox dye 2,6 dichloroindophenol, depending on the number of ink layers on photocatalytic active surface as well as on total amount of glycerol.
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Monitoring of photocatalytic activity
Jurášek, Martin ; Drbohlavová, Jana (referee) ; Veselý, Michal (advisor)
Bachelors thesis deals with kinetics of redox dye 2,6-dichloroindophenol degradation. Thanks to photo-reduced form is colourless, it’s suitable to use it for photocatalytic activity rapid assessment of the thin titanium dioxide layers. The thin layers of TiO2 were prepared using nano-crystalline titanium dioxide suspension with amorphous silica. These layers, including layers of redox dye, were deposited by material printing process. The rate of redox dye photo-reduction was monitored in dependence of number of thin titanium dioxide layers at different UV irradiance. Redox dye concentration was studied using UV-VIS spectroscopy.
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Monetary policy of the European Union
Drbohlavová, Jana ; Jeníček, Vladimír (advisor) ; Abrhám, Josef (referee)
The purpose of this thesis is to sum up the evolution of monetary policy of the European Union so far and to review the impact of the global financial crisis upon the euro area outlining its future. The other purpose is to analyze the Maastricht convergence criteria fulfillment by the Czech Republic and to sum up if the Czech Republic is or isn't ready to enter the euro area and to adopt the common currency. The first and the second part of the thesis are more descriptive of dealing with the historical evolution of monetary policy from the initial formation in the European Economic Community to the origin of the European Monetary system. The third part brings the reader particular information about the Economic and Monetary union and phases of its foundation. It also brings about the European Central Bank which is the most important institution for monetary policy of the European Union and in the end summarizes the advantages and disadvantages of adopting the common currency. In the fourth part I try to assess the impact of the global financial crisis upon the states of the euro area and mention the view of experts on its future. The last chapter deals with the potencial entry of the Czech Republic to the euro area. That review is based on the analysis of the Maastricht convergence criteria fulfillment.
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Export opportunities of czech entities on the Canadian market with a view to the cultural diversity
Drbohlavová, Jana ; Müllerová, Františka (advisor) ; Gullová, Soňa (referee)
From the first chapter a reader can learn the basic information about Canada which means information about geography and demography, official languages, regional division, political system and history. The second chapter will be related to the economical characteristic of Canada, to the basic economic indicators and then to the development of the particular economic sectors. The third chapter will generally describe the international trade of the country, its trade balance, territorial and commodity structure and at last the conditions of export and import activities. The fourth chapter will be about the business and economic relations with Czech Republic. The last, fifth chapter, will give the reader a chance to learn more about the cultural diversity and deal with the canadian partners.
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