Příprava a charakterizace povlaků na bázi nanočástic oxidu zinečnatého
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Cílem této bakalářské práce byla příprava nanočástic ZnO a zkoumání vlivu parametrů syntézy na jejich vlastnosti a následná příprava povlaků metodou dip-coating.Pro přípravu nanočástic byly prozkoumány dva hydroxidy, byl sledován růst nanočástic, jejich velikost, stabilita a výtěžek reakce. Vybraný sol byl využitý pro tvorbu povlaků na planárních substrátech. Bylo prozkoumáno, jak se mění tloušťka povlaků v závislosti na rychlosti vytahování substrátu a v závislosti na různých koncentracích.Provedeným výzkumem bylo zjištěno, že nanočástice oxidu zinečnatého jsou monodisperzního charakteru a mají velikost v rozmezí 5 až 25 nm v závislosti na použitém hydroxidu. Bylo určené množství hydroxidu, který se spotřebovává v kondenzačním procesu a jeho vliv na tvorbu a stabilitu ZnO solu. Ohledně povlaků byla zjištěna a vytvořena funkce závislosti tloušťky na rychlosti vytahování substrátu. Bylo ukázáno, že při použití vyšších koncentracích zvětšuje se tloušťka povlaků.
The aim of this bachelor thesis was the preparation of ZnO nanoparticles and examination the influence of synthesis parameters on their properties and subsequent preparation of coatings by the dip-coating method.For the preparation of nanoparticles two hydroxides were investigated, it was monitored the growth of nanoparticles, their size, stability and the yield of the reaction. The selected sol was used for the formation of coatings on planar substrates. It was tested how the thickness of the coatings varies depending on both the velocity of dipping and on the different concentrations.The research has found that zinc oxide nanoparticles are monodisperse and have a size ranging from 5 to 25 nm depending on the used hydroxide. It was determined the amount of hydroxide that is consumed in the condensation process and its effect on the formation and stability of ZnO sol. Regarding the coatings, it was found and created a function of thickness dependence on the speed of dipping of the substrate. It has been shown that using higher concentrations, the thickness of the coatings increases.
The aim of this bachelor thesis was the preparation of ZnO nanoparticles and examination the influence of synthesis parameters on their properties and subsequent preparation of coatings by the dip-coating method.For the preparation of nanoparticles two hydroxides were investigated, it was monitored the growth of nanoparticles, their size, stability and the yield of the reaction. The selected sol was used for the formation of coatings on planar substrates. It was tested how the thickness of the coatings varies depending on both the velocity of dipping and on the different concentrations.The research has found that zinc oxide nanoparticles are monodisperse and have a size ranging from 5 to 25 nm depending on the used hydroxide. It was determined the amount of hydroxide that is consumed in the condensation process and its effect on the formation and stability of ZnO sol. Regarding the coatings, it was found and created a function of thickness dependence on the speed of dipping of the substrate. It has been shown that using higher concentrations, the thickness of the coatings increases.
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ZnO, dip-coating, sol-gel, povlaky, nanočástice, ZnO, dip-coating, sol-gel, coatings, nanoparticles