|
|
Techniques of thin layers deposition and characterization, their analysis using scanning electron microscopy
Kiška, Roman ; Moravčík, Igor (referee) ; Čupera, Jan (advisor)
My thesis is concerned with the application of thin films methods and it focuses on the method of PVD and CVD. Another part of my work is experimental, where two samples were preapared by magnetron sputtering and by method of gas phase deposition. The aim of the work was to compare their material properties with commercially produced samples. Severel parts were measured - nanohardness, adhesion, roughness and thickness. Theoretical part focuses on chemical and physical essence of the different methods of the deposition of thin films and on the description of material properties, that are essential for thin films. The practical part includes the description of depositional processes and of the characteristic techniques used in the practical part.
|
|
|
Cross-correlation of mechanical properties of hydrogels on micro/macro-scale studied by atomic force microscopy and oscillation rheometry
Kuzník, Pavel ; Szabová, Jana (referee) ; Smilek, Jiří (advisor)
This bachelor thesis focuses on measurement of mechanical properties of hydrogels on local and macroscopic level by atomic force microscopy (AFM) and oscillation rheometry. Both techniques allows measurement of hydrogel in hydrated state which provides native state of measured samples and prevents them from inserting artefacts into measurements made by AFM, which could negatively change measured values. AFM has more measuring modes, but for measurement in this bachelor thesis was used tapping mode called Contact mode force mapping. The largest part of this work is concentrated on measurement of agarose hydrogel, which pertains to category of physical hydrogels, concretely concentration line and time dependency (syneresis of hydrogel) were measured by both techniques. Suitability of AFM for measuring of mechanical properties of hydrogels was tested on other hydrogel samples with different type of crosslinking. Hydrogel based on sodium alginate crosslinked by calcium ionts (Ca2+) was tested. Furthermore were measured two chemical gels including polyethylenglycol (PEG) hydrogel and organogel of ethylene propylene-diene monomer (EPDM). Measurement of PEG hydrogel included time dependency due to its swelling and absorption behaviour, which led into dissolving of PEG hydrogel. EPDM organogel is not dissolving in water, so it was measured as a standard for AFM measurements. In addition to Young’s modulus as a base parameter for measurement of hydrogels in swollen state, was adhesion and work of adhesion tested in case of EPDM gels.
|
|
|
Torsion of beams with a non-circular cross-section
Hablák, Ján ; Majer, Zdeněk (referee) ; Profant, Tomáš (advisor)
The bachelor’s thesis focuses on the issue of torsion of prismatic bar with a non-circular cross-section, its model in various software, calculation and comparison of real measurements with calculated values. The aim of the work is to get acquainted with the basic theoretical knowledge, which will subsequently be applied in the modeling and calculation of specific closed profiles. Individual results are compared in the thesis. Basic concepts and knowledge are explained in the theoretical part. The practical part deals with the calculation of individual cross-sections and practical measurement.
|
|
|
Techniques of thin layers deposition and characterization, their analysis using scanning electron microscopy
Kiška, Roman ; Moravčík, Igor (referee) ; Čupera, Jan (advisor)
My thesis is concerned with the application of thin films methods and it focuses on the method of PVD and CVD. Another part of my work is experimental, where two samples were preapared by magnetron sputtering and by method of gas phase deposition. The aim of the work was to compare their material properties with commercially produced samples. Severel parts were measured - nanohardness, adhesion, roughness and thickness. Theoretical part focuses on chemical and physical essence of the different methods of the deposition of thin films and on the description of material properties, that are essential for thin films. The practical part includes the description of depositional processes and of the characteristic techniques used in the practical part.
|
guest ::
