National Repository of Grey Literature 84 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Gel Polymer Electrolytes for Electrochemical Power Sources
Jahn, Michal ; Bartušek, Karel (referee) ; Paidar,, Martin (referee) ; Sedlaříková, Marie (advisor)
Dissertation thesis is focused on study of gel polymer electrolytes for electrochemical power sources, but also for other application. The electrical, electrochemical, mechanical and optical properties of gel electrolyte samples were measured in this work. The main goal was to prepare samples with high specific conductivity and with largest possible potential windows. Thermal stability of some samples was also monitored using thermogravimetric analyzes. The optimization of the chemical composition, quantities and ratios of individual chemicals has been made. Comparison of thermal polymerization and UV polymerization was performed. In the first part of the work, aprotic solvents and their mixtures in combination with lithium and sodium salts and one ammonium salt were investigated. Another subject of research was various crosslinking agents with methacrylate-based monomers. The second part of the work investigated the effect of ionic liquids, phosphor base flame retardants and nanoparticles as additives to gel electrolytes. In the last part of the work, the influence of the magnetic and electric field on the polymerization of gel electrolytes containing nanoparticles and selected copolymers was studied. Finally, a Li-ion cell with a graphite anode, LiFePO4 cathode and selected gel electrolyte was assembled.
Design of Perovskite Photovoltaic Solar Cells and Research of their Stability
Strachala, Dávid ; Šály,, Vladimír (referee) ; Sedlaříková, Marie (referee) ; Vaněk, Jiří (advisor)
The work in the first part describe the design of a perovskite photovoltaic cell with planar inverse structure using photovoltaically active material CH3NH3PbI3 and CH3NH3PbI3-xClx. The theoretical description of perovskite materials is supplemented by knowledge of degradation mechanisms reducing the resulting stability of samples and also presents a comprehensive overview of the technology development. The following text brings an innovative process for the perovskite photovoltaic cells production, which has enabled manufacturing of reproducible samples with parameters comparable to the foreign workplaces. The second part of the research analyzes the influence of the external environment to the samples and based on experimental outputs explains possible degradation mechanisms of perovskite material. At the final part of the dissertation thesis is presented and characterized unique structure of planar inversion perovskite cells with a material composition increasing the resistance against external humidity.
Thin film systems
Rada, Vojtěch ; Sedlaříková, Marie (referee) ; Zatloukal, Miroslav (advisor)
This bachelor’s thesis is focused on the problematics of thin-film technology. In the beginning the work deals with a general theory of this problematics, discusses various methods and ways to lay a thin film, where more emphasis is placed on magnetron sputtering, which is used in the practical part of the work, and describes procedures that are performed before and after the application of the thin film. The magnetron sputtering coating machine NP-12 and its control are described in the practical part of the work. Subsequently the selection and adjustment of suitable substrates is made, the thin-film system is deposited using the magnetron sputtering method and the analysis of the properties of deposited thin-film samples is done.
Biodegradable bones implants based on iron
Hrabovský, Jan ; Zatloukal, Miroslav (referee) ; Sedlaříková, Marie (advisor)
This work deals with a current topic, which are biodegradable bone implants. These implants seem to be a suitable candidate for temporary fixations, with their gradual decomposition. An important parameter is not only the mechanical properties so that the material can withstand the load, but above all the corrosion properties and the degradation process. This work introduces the physiology of bone, trace elements and also describes current trends in the field of implants. The last part is a theoretical introduction to cross-stage processes. The practical part is focused on the preparation of iron-based samples with various dopants, subsequent annealing and analysis.
New gel electrolytes based on copolymers for electrochemical power sources
Peterová, Soňa ; Sedlaříková, Marie (referee) ; Veselkova, Iuliia (advisor)
This thesis deals with description of preparation and use of monomers and copolymers for gel polymer electrolytes usable in electrochemical power sources. This thesis is divided in theoretical and experimental part. The theoretical part describes electrolytes focused on gel polymer electrolytes, measuring methods and materials used for experiments. The experimental part deals with calculation of composition of polymer electrolytes, method of preparation and evaluation of measured results. The method of applying GPE to a negative LTO electrode and a positive NMC electrode is described too. Linear Sweep Voltammetry (LSV) and Potentiostatic Electrochemical Impedance Spectroscopy (PEIS), Cyclic Voltammetry (CV) and Galvanostatic Cycling with Potential Limitation (GCPL) were chosen for measurement of properties.
Biodegradable bones implants based on Fe
Tkáčová, Tereza ; Míka, Martin (referee) ; Sedlaříková, Marie (advisor)
This thesis writes about biodegradable bone implants based on iron. The currently used metal-based implants have disadvantage in an often need of secondary surgery intervention to remove the implant. Therefore, there is a big research of biodegradable bone implants nowadays. In this work, iron-based materials with the addition of zinc and magnesium are being investigated. The produced samples have been immersed in a solution of NaCl and simulated body fluid, SBL. Subsequently there were regularly analysed changes of corrosion potential, pH, conductivity and also weight loss was watched.
Materials for biodegradable bones based on Fe
Hrabovský, Jan ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
The thesis deals with biodegradable bone implants which must have good mechanical properties and also good compatibility with the human body. The thesis contains literary research in the area of bone physiology, biogenic materials and implants for the human body. The thesis focues on the selection of suitable materials for biogenic implants. It is also described the preparation of iron powder mixtures and application onto selected materials. The selected samples were subjected to thermal analysis.
Gel aprotic electrolytes with tetraalkylamonium salts
Michalec, Juraj ; Veselkova, Iuliia (referee) ; Sedlaříková, Marie (advisor)
The essence of this graduate thesis is to summarize knowledge about the aprotic gel electrolytes. In the graduate thesis, there are explained methods for mensuration electrochemical properties of the aprotic gel electrolytes. In the theoretical part, I focus on the knowledge related to gel polymeric electrolytes, their history, properties, mechanisms and application. In the experimental part, I describe the preparation of the samples of the gel polymeric electrolytes, in which I evaluate their properties, electrical conductivity and potencial window.
Influence of temperature on parameters of lithium-ion cells
Kuthan, Jiří ; Sedlaříková, Marie (referee) ; Máca, Josef (advisor)
Masters Thesis summarizes the theoretical findings about lithium-ion akumulators. It gives a overview of the basic types of galvanic cells, then deals in detail with the lithium-on cell. It's composition, electrochemical principle of working, thermal dependence, construction and area of application. The thesis describes the basic methods of measuring lithium-on cells, such as cyclic charging and discharging, cyclic voltammetry. The practical part compares selected types of materials for negative elektrodes in different temperatures.
Biodegradable bone implants
Galanová, Zuzana ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
This master thesis is focused on producing orthopaedic implant materials and measuring their corrosion properties. It describes the bone and its structure, types, bone ossification and healing. It defines functions of orthopaedic implants and mentions the types of implants – biodegradable and non-biodegradable. The thesis interprets what corrosion is, what categories of corrosion exist and how does the corrosion influence orthopaedic implants. Preparing the solution of stimulated body fluid and manufacturing samples of different metal combinations (of iron, manganese, phosphorus, magnesium, silver and zinc) is included in this thesis, together with corrosion measurements, microscopic observations, EDAX analysis, metallographic analysis, microhardness testing of samples and pH changes measurements of solutions, and the results are interpreted and explained.

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