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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
In-situ microscopy in corrosive environment
 Nedvěd, Matěj ; Velický, Matěj (referee) ; Kolíbal, Miroslav (advisor)
This diploma thesis focuses on in-situ electron microscopy and its application to monitoring the chemical reactions on the surfaces of nanomaterials. The possibilities offered by this technique are presented, and the existing solution of an in-situ scanning electron microscope used for experiments is described. The thesis introduces Janus two-dimensional materials based on transition metal dichalcogenides with a focus on their preparation. A detailed description follows regarding the preparation of thin layers of WSe2 material using mechanical exfoliation and experiments conducted using an in-situ microscope. These experiments involved annealing of WSe2 material in the presence of hydrogen sulfide (H2S) while simultaneously observing it with an electron microscope, aimed to facilitate the chalcogenide exchange in this material. The morphology, composition, and optical properties of the material were subsequently analyzed using Raman spectroscopy and photoelectron spectroscopy. Finally, an experiment resulting in the successful exchange of selenium in WSe2 for sulphur is presented.
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Structural changes in aluminium alloys studied by in-situ transmission electron microscopy.
 Bajer, Jan ; Cieslar, Miroslav (advisor) ; Šíma, Vladimír (referee)
Aluminium alloys of the 6### series are widely used in the industry. To achieve the optimal properties, the as-cast alloy must by treated by several steps. The first treating step is the homogenization annealing of the as-cast alloy. During homogenization dissolution of eutectic phases occurs and distribution of impurity elements in the alloy is more uniform. It requires a high annealing temperature near the melting point of the alloy. One of the method that allows direct observation of the microstructure during homogenization is in-situ electron microscopy. Specimens from EN AW 6082 alloy were annealed in several model homogenization regimes and in-situ monitored by electron microscopy. Observed processes were compared with the results of resistivity measurements. EDS measurements were taken at the beginning and at the end of the homogenization process.
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