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Study of interaction of HA / biosklo based composites in simulated body fluid
Riša, Juraj ; Švec, Jiří (referee) ; Bartoníčková, Eva (advisor)
This work deals with bioceramic materials based of hydroxyapatite, bioglass and their composites. These materials are commonly used in medicine, especially as hard tissue substituents. They can be prepared by different types of syntheses, from which the most common were picked for this work – precipitation of hydroxyapatite and sol-gel method for bioglass. Thermal analysis and X-ray diffraction were used for characterization of prepared powders. This thesis studies mostly their features within the composite materials, which were foamed for better bone stimulation. Properties and possibility in bio application of materials is firstly studied through their interaction in simulated body fluids, which mimics ionic concentration of human plasma. Experimental part covers synthesis of ceramic powders, their characterization, preparation of mixtures and scaffolds foamed through in situ foaming, their sintering at ideal temperatures, characterization of porosity and phase changes due to sintering. Basic tests of apatite formation ability were provided by incubation of prepared scaffolds in simulated body fluid for 3, 7, 14 and 21 days and their assay in scanning electron microscopy. Changes in concentration of Ca2+ a PO4 3- ions as well as in weight of the specimen were tracked within the incubation period.
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Adjustment of laboratory wastewater containing chromium
Riša, Juraj ; Vomáčková, Alena (referee) ; Pilátová, Ivana (advisor)
The Bachelor Thesis deals with treatment of laboratory waste water containing chrome. It examines the chrome and its compounds in waste water from inorganic laboratory, trying to concentrate it in the waste water. It uses spectrophotometry with diphenylcarbazide as a method to determine concentration of chromium. To diminish the amount of chromium in waste water, precipitation with barium chloride is used prior to regular pressure filtration. Other part of the Thesis focus on the economic effectiveness of the treatment and its comparison to transport of the waste.
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Study of interaction of HA / biosklo based composites in simulated body fluid
Riša, Juraj ; Švec, Jiří (referee) ; Bartoníčková, Eva (advisor)
This work deals with bioceramic materials based of hydroxyapatite, bioglass and their composites. These materials are commonly used in medicine, especially as hard tissue substituents. They can be prepared by different types of syntheses, from which the most common were picked for this work – precipitation of hydroxyapatite and sol-gel method for bioglass. Thermal analysis and X-ray diffraction were used for characterization of prepared powders. This thesis studies mostly their features within the composite materials, which were foamed for better bone stimulation. Properties and possibility in bio application of materials is firstly studied through their interaction in simulated body fluids, which mimics ionic concentration of human plasma. Experimental part covers synthesis of ceramic powders, their characterization, preparation of mixtures and scaffolds foamed through in situ foaming, their sintering at ideal temperatures, characterization of porosity and phase changes due to sintering. Basic tests of apatite formation ability were provided by incubation of prepared scaffolds in simulated body fluid for 3, 7, 14 and 21 days and their assay in scanning electron microscopy. Changes in concentration of Ca2+ a PO4 3- ions as well as in weight of the specimen were tracked within the incubation period.
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Adjustment of laboratory wastewater containing chromium
Riša, Juraj ; Vomáčková, Alena (referee) ; Pilátová, Ivana (advisor)
The Bachelor Thesis deals with treatment of laboratory waste water containing chrome. It examines the chrome and its compounds in waste water from inorganic laboratory, trying to concentrate it in the waste water. It uses spectrophotometry with diphenylcarbazide as a method to determine concentration of chromium. To diminish the amount of chromium in waste water, precipitation with barium chloride is used prior to regular pressure filtration. Other part of the Thesis focus on the economic effectiveness of the treatment and its comparison to transport of the waste.
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