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Plastic materials and their treatment
Kopečný, Aleš ; Zemčík, Oskar (referee) ; Osička, Karel (advisor)
This research the basic empirical knowledge about the processing of plastic materials. The following are analyzes of the nature of plastic materials and analysis of the use of these materials in the engineering industry. This paper deals with the technological methods of processing plastics. Specifically, it is done as a summary of information about the technologies needed for the production of molds for plastics. Key words
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Study of the influence of nanoparticles on water properties
Šram, Matěj ; Komendová, Renata (referee) ; Řezáčová, Veronika (advisor)
This work deals with the study of the influence of platinum nanoparticles with a size of 3 nm on the properties of water in a porous system. SiO2 with a defined pore size was used as a porous system, which can simulate the mineral component of the soil. The theoretical part deals with the properties of free and porous water and the impact of nanoparticles on the environment. In the experimental part, the properties of free water, water in the porous system and the influence of the presence of platinum nanoparticles on these systems are investigated using differential scanning calorimetry (DSC). The observed processes were melting, solidification and evaporation, and derived quantities such as crystallization and melting point.
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Phosphate binders
Kalina, Lukáš ; Ptáček, Petr (referee) ; Šoukal, František (advisor)
The work deals with the preparation and study of polyphosphate composites. Aluminum phosphates provide some unusual properties like high-heat resistance in terms of inorganic binders. The addition of chromium in the form of Cr2O3 or directly the bond with the aluminum-chromium-phosphate can improve the properties of this binder. Highly viscous Al2Cr(H2PO4)9 and Al3Cr(H2PO4)12 binders were prepared by dissolving Al(OH)3 and CrO3 in 85% phosphoric acid, and mixed with Al2O3 and Cr2O3 fillers. The composites were cured in the furnace at 150 °C for 24 h under pressure of 10 MPa. During the annealing at temperatures up to 1 500 °C changes in chemical structure of the cured composites were observed, leading to the understanding of the creation of crystalline phases and their eventual changes. The characterization of binders was mainly based on FT-IR, EDAX, TG-DTA and optical microscopy analyses.
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Methods of primary influencing steel and steel ingot structures
Stejskal, Marek ; Záděra, Antonín (referee) ; Blažík, Petr (advisor)
This bachelor thesis is focused on the ways of influencing metal structure during it’s solidification in the mold that leads to changes in mechanical properties. In the first part there is explained the principle of metal crystalization, it’s types and mechanisms, there is also described the issue of metal solidification in the mold. In the second part of the thesis there is a general view of methods being used for primal influencing of steel structure. The principles and ways of use for these methods in foundry industry are explained.
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The study of polymorphism and optimization of active pharmaceutical ingredients crystallisation
Novák, David ; Ing.Ladislav Cvak, Ph.D. (referee) ; Ing.Roman Gabriel (advisor)
Active pharmaceutical ingredients (APIs) are frequently delivered to the patient in the solid-state as part of an approved dosage form (tablets, capsules, etc.). Understanding and controlling the solid-state chemistry of APIs is therefore an important aspect of the drug development process. APIs can exist in a variety of distinct solid forms, including polymorphs, solvates, hydrates, co-crystals and amorphous solids. Each form displays unique physicochemical properties that can profoundly influence the bioavailability, manufacturability, stability and other performance characteristics of the drug. Most APIs are purified and isolated by crystallisation from an appropriate solvent during the final step in synthetic process. The main objective of a crystallisation process is to produce crystals with desired properties such as particle size distribution (PSD), shape and purity. All pharmaceutical dosage forms must be produced in uniform units, and good content of uniformity is only possible when the size of the active component is carefully controlled. For on-line control of crystallisations of Quetiapine Fumarate to achieve desired PSD and no changed physicochemical purity was used the Lasentec Focus Beam Reflectance Measurement (FBRM) system.
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Crystallization of coating systems based on epoxy resins.
Seidlová, Michaela ; Dohnálek,, Pavel (referee) ; Petránek, Vít (referee) ; Drochytka, Rostislav (referee) ; Bydžovský, Jiří (advisor)
Crystallisation of epoxy resins based on bisphenol A and bisphenol F is the natural property of these oligomers. However, manufacturers of paints and other systems based on these epoxy resins, strive to slow down the crystallisation process as much as possible, thereby prolonging the shelf life and improving the competitiveness of their products. The main aim of the thesis is generalisation of the factors influencing the crystallisation process of epoxy resins based on bisphenol A and bisphenol F, verifying new approaches to the possibility of influencing the crystallisation process and determining the possibility of using a certain degree of epoxy resins crystallinity based on bisphenol A and bisphenol F in the preparation and production of epoxy resinbased coating systems.
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Zero liquid discharge systems
Štylárková, Petra ; Máša, Vítězslav (referee) ; Touš, Michal (advisor)
The bachelor thesis contains a description of zero liquid discharge systems. It describes the process, which has three main parts, it is pretreatment, preconcentration and evaporation. In each parts there is a basic description of the principle of the metod, their use etc.
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Study of the limestone decarbonation process
Koporcová, Diana Mária ; Všianský,, Dalibor (referee) ; Dvořák, Karel (advisor)
The bachelor thesis deals with a research and a description of decarbonation process of limestone during the lime burning. The goal of the bachelor thesis is to try to find a connection between characteristics of input material and course of the decarbonation process, which is monitored by high temperature XRD analysis. There is an evaluation of the microstructure of emerging calcium oxide, especially by the size of the crystallites, in the experimental part.
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Nutrients recovery by processing liquid digestate
Štylárková, Petra ; Vondra, Marek (referee) ; Touš, Michal (advisor)
Biogas plants produce a large amount of digestate or liquid digestate annually, which can be further processed to obtain nutrients. This method is not widespread due to high investment costs. In this paper, technologies for nutrient recovery from liquid digestate as well as a techno-economic model are presented. This model was developed using information from literature and calculations in a process simulator. It is able to calculate the overall balance of the system from the input parameters and to tentatively assess the economic evaluation. The use of the model was demonstrated with a case study of a specific biogas plant. The analysis of the effects of the price parameters showed, among other things, that for the biogas plant in question the sensitivity of the return to a lower price of ammonium sulphate (product) is high, while in the case of struvite (product) even at its low price there is no such sensitivity.
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