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Study of thin transparent films properties
Schmiedová, Veronika ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
The main aim of this bachelor´s thesis is a study of thin transparent layers of organic materials (PPV, P3HT, TiO2, DPP). The theoretical part describe the methods of quality examinations of their surface, mostly the use of optical and interference microscopy. For elaboration of data was used the image analysis via HarFA program. Thickness of layer and the index of refraction was provided by interference microscope. From the interference images was identified the amplitude of groove for various values of treshold, but mainly the interface inhomogenity of groove, which proofs the surface inhomogenity of samples. For the images taken by the optical microscope were allocated the average errors (but also errors of superior sorts) defining the surface inhomogenities of samples. The conlusion of this study compare the results of both methods.
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Mesoporous and microstructured layers of titanium dioxide
Lepičová, Martina ; Ing. Viera Jančovičová,Ph.D. (referee) ; Veselý, Michal (advisor)
This bachelor thesis provides an overview of modern ways of titanium dioxide thin layer preparation including material printing and their principles. Preparation of tetrabutoxide sol as a precursor of titanium dioxide with diethanolamine and polyethylene glycol as templating agents and its delivery to glass substrate by material printing is described. This work is focused on characterization of prepared thin layers of titanium dioxide by optical microscopy and making of microphotography database of prepared samples.
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Catalytic fading of inkjet prints
Brablc, Tomáš ; Havlínová,, Bohuslava (referee) ; Veselý, Michal (advisor)
This thesis deals with the principles of inkjet printing, ink composition, receiving layers and print fading. The fading usually does not take place only for one reason, it is affected by more factors at a time. The catalytic fading due to light is studied. The catalytic fading takes place in overprinted areas where are situated more then one ink. The experiment was realized by the exposure of overprinted fields in accelerated ageing test. Mutual influence of two dyes from CMY together and then influence of black dye (K) on these overprinted fields were observed.
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Study of thin films refractive index by interference microscopy
Procházka, Petr ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
This bachelor thesis is focused to measure of spectral dependences of refractive index in thin layers. The object of this thesis was measurement of dispersion dependences of refractive index. The theoretical part deals with present methods of refractive index measurements and quantities associated with. These methods were ordered from the easiest to the most complex methods. Intention of own work was reached results by the very easy method of interference mi-croscopy. Thin layers of various organic matters were investigated by optical microscope and main-ly by interference microscope to determine their optical attributes – refractive index and his dis-persion dependences. There were images, which were made by interference microscope and digital camera. These images were subjected to image analysis by computer program HarFA. Dispersion dependences of refractive index were proved by elaboration by this computer pro-gram.
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Possibilities of pesticide degradation by titanium dioxide
Píšťková, Veronika ; Veselý, Michal (referee) ; Vávrová, Milada (advisor)
The aim of this bachelor´s thesis is a selection of pesticides, which could be degradated using titanium dioxide. The first part of the paper deals with general pesticide characteristics, subdivision of pesticides, mode of action on target agents and transformations of pesticides within the environment – the metabolic and the non-metabolic tranformation. The second part of the paper deals with heterogeneous photocatalysis using semiconductor TiO2, which is activated by ultraviolet or solar radiation. Using this method pesticides could be transformed even into carbon dioxide, water and inorganic mineral salts. Furthermore, there are mentioned the factors, which affect degradation rate, analytical methods to determine kinetics of degradation and methods for monitoring transients and end products. By each group of pesticides there are stated the representatives from this group, which have been used for investigation of degradation methods. Furthermore are mentioned decomposition mechanisms of reaction and the intermediate products formed during the photocatalysis process.
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Preparation of photocatalytically active layers of titanium dioxide
Šeffer, Lukáš ; Jančovičová, Viera (referee) ; Veselý, Michal (advisor)
This bachelor work gives an overview about preparation of titanium dioxide and silicon dioxide thin films by sol-gel process, using coating methods as spin coating, dip coating, capillary and cell coating, flow coating, spray coating, pyrosol process, chemical vapour deposition and printing. The procedures of composite films preparation obtained by mixed sols of titanium dioxide and silica dioxide are also discussed together with preparation of double layer films, when titanium dioxide is coated on glass substrate covered by a silica dioxide layer. The methods of photocatalytic activity testing are the important part of this work.
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Preparation of Stuctured Thin Layers of Titanium Dioxide
Lukešová, Magdalena ; Jančovičová, Viera (referee) ; Veselý, Michal (advisor)
Cílem práce bylo seznámit se s dostupnými zdroji popisujícími zkoumanou tématiku tenkých vrstev oxidu titaničitého. Na připravených tenkých filmech byla studována fotokatalytická aktivita a indukované hydrofilní vlastnosti. Transparentní filmy oxidu titaničitého byly připraveny na sodnovápenatém skle metodou sol-gel. Na přípravu TiO2 solu byl použit tetraisopropoxid titaničitý (TTIP) jako prekurzor. Přidaný polyethylen glykol (PEG) sloužil jako strukturu-řídící složka, acetyl aceton zase ovlivňoval hydrolyzační a kondenzační reakce. Pro nanášení solu na skleněné destičky byla použita technika mikropiezo depozice. Na získaných filmech byla studována fotokatalytická aktivita prostřednictvím degradace 2,6-dichlorindofenolu (DCIP). Rychlost odbourávání DCIP byla vyjádřena pomocí formální rychlostní konstanty reakce prvního řádu. Měřením kontaktního úhlu byla zkoumána smáčecí schopnost vrstev. Filmy, které byly vystaveny ultrafialovému záření, se chovaly superhydrofilně.
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Fastness of Photographs Exposed to Light and Pollutants
Pasečná, Klára ; Havlínová, Bohuslava (referee) ; Veselý, Michal (advisor)
The bachelor thesis deals with a study of general influences of light and pollutants (mainly ozone) on ink printing. The theoretical part describes the basic principles of printing means, printing materials and some ways of ink print degradation. The experimental part focused on measuring specific coulometric quantities of a test pattern, which was done in the chamber for ozone development and the accelerated weathering device using light and heat (xenotest). An important finding from this study is that the influence of ozone on tested pigment ink is much smaller than the one of UV radiation. The most susceptible to degradation by radiation and ozone was yellow ink.
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Accelerated ageing of ink-jet printouts
Buteková, Silvia ; Reháková,, Milena (referee) ; Veselý, Michal (advisor)
Ink jet printing displaces in consequence its versatility the forefront in the printing applications. The prints must be stable for archiving, even if they are exposed to the environment. Now, the improvement of photo stability of ink jet prints is an important goal. This bachelor thesis deals with the ageing of prints produced by ink jet technology. The attention was paid to the influence of light on durability of prints especially. The experiment was made under natural conditions (ageing owing to sunlight). The changes of printed colours were evaluated after some chosen colorimetric quantities were measured.
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