National Repository of Grey Literature 97 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Kinetics of Inkjet Dyes Degradation
Buteková, Silvia ; Mikula, Milan (referee) ; Klusoň, Petr (referee) ; Veselý, Michal (advisor)
The stability of inkjet print is influenced by a lot of factors. Mutual effects of these factors accelerate the print degradation. The surrounding environment in image stability plays an important role, when the prints degrade especially by the light. The degradation of inkjet prints is presented as a decrease of dye or multiple dyes. It is necessary to know the dye concentration for the dye decrease prediction in the time. This dissertation thesis deals with the study of kinetics and changes in electron and molecular structure of digital photography prints after accelerated ageing tests. The study of resistance of inkjet prints was realized on one type of media using three different sets of inks. Changes in printed colours were measured and evaluated in calibration (by PLS calibration and least squares method). On the basis of calibration the dye decrease prediction of real samples in receiving layer was evaluated. Changes in electron and molecular structure were analysed on KBr pellets by FTIR an UV-Vis spectroscopy.
Properties of titania layers fabricated from ball-milled colloid dispersions
Rajmonová, Anna ; Klusoň, Petr (referee) ; Dzik, Petr (advisor)
This diploma thesis deals with changing properties of the thin layered titanium dioxide dispersion depending on the time of ball-milling. Titanium dioxide is immobilized on glass or conductive glass using the spin-coating method and the prepared thin layers are then characterized by various analytical methods. All of used analytical methods are described in theoretical and experimental sections, these methods include scanning electron microscopy, profilometry, dynamic light scattering, integrating sphere, ellipsometry, BET isotherm, voltammetry and chronoamperometry. At the summary of this diploma thesis is described how the properties of titanium dioxide thin layers change during ball-milling process.
Printed light dosimeter for galleries
Škarvadová, Adéla ; Klusoň, Petr (referee) ; Veselý, Michal (advisor)
This bachelor thesis deals with the lighting of the gallery space and the measurement of light intensity inside. The subject of the experimental study are photosensitive composition for the production of disposable printed and thin-film dosimeters for galleries and museums. Kinetic color change of the two systems using two dyes and calibration components was examined. The composition for printing was optimized and dosimeters were prepared with a wide range of light exposure causing a significant color change of the dosimeter, and that from 1,7 klx•h to 200 klx•h.
Photosensitive thin polymeric layers
Rudická, Andrea ; Klusoň, Petr (referee) ; Veselý, Michal (advisor)
This bachelor thesis deals with photosensitive thin polymeric layers. The experimental part deals with the composition preparation and layers coating. The prepared layers were exposed and studied in detail for their color response to the light. The aim was to prepare a dosimeter, to achieve significant color change between individual doses, to improve the mechanical resistence of the layers and to adjust the sensitivity of the compositions to UVB radiation.
Printing inks optimization for gallery dosimeters
Kabelková, Markéta ; Klusoň, Petr (referee) ; Veselý, Michal (advisor)
This bachelor thesis focuses on the optimization of print inks for gallery dosimeters. The experimental part deals with the preparation of a light dosimeter based on two dyes, optimizing their composition with respect to the technique of application of the layers and the sensitivity of dosimeter. The optimization was performed on dependence of pH values, dyes ratio and amount of polymer binder. The layers were applied in various ways, either with individual dyes in two layers over them, or mixing both dyes and applying one layer. The layers were prepared and then they were exposed and studied in detail for their color response to the light. The aim was to prepare a sensitive dosimeter with a clearly recognizable color change.
Sensitivity calibration of visible light dosimeter
Škarvadová, Adéla ; Klusoň, Petr (referee) ; Veselý, Michal (advisor)
The diploma thesis deals with light dosimeters and modern printing and coating techniques for thin-film formation. The subject of experimental study is the optimization of photosensitive compositions for the preparation of disposable, printed and thin-film dosimeters for visible light. Sensitivity, reproducibility and irreversibility of their color change were optimized. Compositions were calibrated for desired light dose. Functional samples for gallery were fabricated and stability of functional samples were tested at high temperatures of storing.
Removal of emerging contaminants from water by a hybrid membrane-catalytic oxidation process
Bourassi, Mahdi ; Klusoň, Petr (advisor) ; Bendová, Magdalena (referee) ; Granger, Pascal (referee)
Emerging contaminants were detected in different surface waters around the globe. These active molecules affect the environment even at trace concentrations. They are sourced mainly from wastewater treatment plants. These contaminants persist the conventional wastewater treatments and gain their way to the environment. This can cause different complications: bioaccumulation, antibiotic resistance, and environmental degradation. The presented Ph.D. thesis is focused on the treatment of wastewater loaded with persistent pollutants. This thesis aimed to evaluate the membrane separation technology and the catalytic wet air oxidation (CWAO) process to associate them in a hybrid process to address this issue. The first part of the hybrid process is focused on challenges faced with the membrane separation process, mainly fouling and selectivity. This part gathers 6 publications all focused on wastewater treatment with membrane separation. As a starter, the review covers the issue presented by the emerging contaminants and the potential of the membrane process for water recovery. The review highlighted the advantages and challenges (fouling and selectivity) of the membrane process. The chapter about membrane fouling gathers two publications: "Removal of ibuprofen from water by different types of...
Removing of organic dyes from water using polyacrylamide hydrogel nanocomposites
Špalová, Anna ; Klusoň, Petr (advisor) ; Krystyník, Pavel (referee)
The unavailability and pollution of water resources have become significant global challenges. Hydrogels composed of cross-linked polymers have emerged as advanced adsorbents for wastewater treatment, owing to their convenient handling and high efficiency. By incorporating appropriate components into the hydrogel structure, the affinity of a specific pollutant to the hydrogel can be modified. Consequently, the resulting hydrogel nanocomposite can display enhanced adsorption capacity, specific selectivity, and other desirable properties. In this thesis, the efficiency of polyacrylamide hydrogel nanocomposites in the removal of organic dyes from water was investigated. Various composites were synthesized, incorporating graphene, kaolin, and laponite. The composition of these composites varied, employing different ratios of monomer to water and monomer to additive. The physicochemical properties of the synthesized hydrogels and their nanocomposites were examined. It was observed that the nanocomposites displayed reduced water-holding capacity compared to pure polyacrylamide hydrogels. The inclusion of additives led to a decrease in nanocomposite rigidity for graphene, minimal alteration in the case of kaolin, and an increase in rigidity for laponite. The compressibility modulus of the samples ranged...
Priority pharmaceutical micropollutants in the context of the Czech Republic and the Water Framework Directive draft
Stonawski, Eva ; Cajthaml, Tomáš (advisor) ; Klusoň, Petr (referee)
One of the major global environmental problems is the pollution by priority micropollutants. These are substances that can have a negative impact on the environment and human health even at relatively low concentrations. Their identification and subsequent regulation on an international level is essential for prevention of the negative effects of these substances. This thesis focused on the assessment of relevance of the proposal of Water Framework Directive in relation to pharmaceuticals and related substances in the context of the situation in the Czech Republic. The analysed input data comprised of results of data monitoring from the Vltava River Basin and information on the distribution of pharmaceuticals from the State Institute for Drug Control between years 2016 and 2022. The data was collected from two sampling points that are situated right before the confluence with the Elbe River. The average of the concentrations above the limit of quantification (LOQ) and without outliers was considered, thus creating a model considering the maximum contamination load. On the basis of this model and information about individual substances, the relevance of the draft WFD for the Czech Republic was assessed. The result of the monitoring showed that during the monitoring period, none of the NECs of the...
Complex identification of N-methylation reaction products in the synthesis of selected pharmaceuticals
Malíková, Sára ; Klusoň, Petr (advisor) ; Cuřínová, Petra (referee)
This thesis studied the process of the N-alkylation reaction of an ergoline derivative in a flow-through microreactor using phase transfer catalysis, which provides a faster exchange of substances at the phase interface and thus accelerates the reaction. Specifically, this reaction involved the N-methylation of LUME (10--methoxy-dihydrolysergic acid methyl ester) to the product MeLUME (1-methyl 10--methoxydihydrolysergic acid methyl ester). Dimethyl sulfate served as the alkylating agent and tetraethylammonium hydroxide as the phase transfer catalyst. Several side products are formed during this reaction. These are mainly LUME acid, which is formed by hydrolysis of the starting substance LUME, as well as the quaternary ammonium salt of the starting substance and the quaternary ammonium salt of the reaction product (MeLUME), which is formed by quaternization of the ergoline skeleton nitrogen due to used excess of the alkylating agent. The aim of this work was to develop an analytical method for the quantitative determination of the starting substance LUME and the products of the investigated N-alkylation reaction, including the most important side products. For this purpose, it was necessary to selectively prepare the above-mentioned side products and, on this basis, to determine their reaction...

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