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The influence of simulated body fluids on the apatite production
Horváthová, Lenka ; Beranová, Denisa (oponent) ; Bartoníčková, Eva (vedoucí práce)
This bachelor thesis deals with the interaction of various simulated body fluids with ceramic biomaterials. It includes fluid preparation, sample preparation and subsequent analysis of their interaction. Individual samples of biomaterials were exposed to a simulated body fluid for a certain amount of time. After this time, a change in the calcium and phosphorus content of the solutions was determined. At the same time, an electron microscope analysis of sample surface was performed where the dependence of calcium and phosphorus changes was demonstrated. Electron microscopy analysis revealed the formation of new phases on the surface of the studied materials.
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Study of interaction of HA / biosklo based composites in simulated body fluid
Riša, Juraj ; Švec, Jiří (oponent) ; Bartoníčková, Eva (vedoucí práce)
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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Elektrochemické charakteristiky hořčíkových slitin AZ31 a AZ61 v Hankových roztocích
Minda, Jozef ; Wasserbauer, Jaromír (oponent) ; Tkacz, Jakub (vedoucí práce)
Práca sa zaoberá elektrochemickou charakterizáciou koróznych vlastností perspektívnych materiálov, horčíkových zliatin pre biomedicínske aplikácie. Boli použité tvárnené zliatiny AZ31 a AZ61 a exponované koróznemu prostrediu Hankových roztokov (SBF) na simuláciu podmienok prostredia v živých organizmoch. Na hodnotenie povrchu bola využitá rastrovacia elektrónová mikroskopia (scanning electron microscopy, SEM) s prvkovou analýzou pomocí energiovo-disperznou spektroskopie (EDS). Boli vykonané krátkodobé (5 min) a dlhodobé (72 hod) korózne testy s cieľom optimalizovať metodiku merania a získať korózne parametre – predevšetkým koróznyí potenciál (Ekor), koróznu prúdovú hustotu (ikor), koróznu rýchlosť (vkor) a polarizační odpor (RP). Na vyhodnotenie krátkodobých testov boli využité potenciodynamické skúšky, konkrétne metóda lineárnej polarizácie (LP) a pre dlhodobé experimenty bola využitá metóda elektrochemickej impedančnej spektroskopie (EIS). Z nameraných výsledkov boli porovnané vplyvy zloženia zliatin (AZ31 a AZ61), povrchovej úpravy (brúsenie a leštenie) a zloženia roztoku (SBF bez obsahu Ca, Mg a s obsahom Ca, Mg). Bolo charakterizované komplexné korózne správanie v čase a diskutované možné korózne mechanizmy.
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Study of interaction of HA / biosklo based composites in simulated body fluid
Riša, Juraj ; Švec, Jiří (oponent) ; Bartoníčková, Eva (vedoucí práce)
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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The influence of simulated body fluids on the apatite production
Horváthová, Lenka ; Beranová, Denisa (oponent) ; Bartoníčková, Eva (vedoucí práce)
This bachelor thesis deals with the interaction of various simulated body fluids with ceramic biomaterials. It includes fluid preparation, sample preparation and subsequent analysis of their interaction. Individual samples of biomaterials were exposed to a simulated body fluid for a certain amount of time. After this time, a change in the calcium and phosphorus content of the solutions was determined. At the same time, an electron microscope analysis of sample surface was performed where the dependence of calcium and phosphorus changes was demonstrated. Electron microscopy analysis revealed the formation of new phases on the surface of the studied materials.
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Elektrochemické charakteristiky hořčíkových slitin AZ31 a AZ61 v Hankových roztocích
Minda, Jozef ; Wasserbauer, Jaromír (oponent) ; Tkacz, Jakub (vedoucí práce)
Práca sa zaoberá elektrochemickou charakterizáciou koróznych vlastností perspektívnych materiálov, horčíkových zliatin pre biomedicínske aplikácie. Boli použité tvárnené zliatiny AZ31 a AZ61 a exponované koróznemu prostrediu Hankových roztokov (SBF) na simuláciu podmienok prostredia v živých organizmoch. Na hodnotenie povrchu bola využitá rastrovacia elektrónová mikroskopia (scanning electron microscopy, SEM) s prvkovou analýzou pomocí energiovo-disperznou spektroskopie (EDS). Boli vykonané krátkodobé (5 min) a dlhodobé (72 hod) korózne testy s cieľom optimalizovať metodiku merania a získať korózne parametre – predevšetkým koróznyí potenciál (Ekor), koróznu prúdovú hustotu (ikor), koróznu rýchlosť (vkor) a polarizační odpor (RP). Na vyhodnotenie krátkodobých testov boli využité potenciodynamické skúšky, konkrétne metóda lineárnej polarizácie (LP) a pre dlhodobé experimenty bola využitá metóda elektrochemickej impedančnej spektroskopie (EIS). Z nameraných výsledkov boli porovnané vplyvy zloženia zliatin (AZ31 a AZ61), povrchovej úpravy (brúsenie a leštenie) a zloženia roztoku (SBF bez obsahu Ca, Mg a s obsahom Ca, Mg). Bolo charakterizované komplexné korózne správanie v čase a diskutované možné korózne mechanizmy.
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