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Properties of metal layers realized with vapour deposition
Milichovský, Miloš ; Švecová, Olga (referee) ; Šandera, Josef (advisor)
This work deals with vacuum evaporation of metals, basic principles of this technology and exploring the properties of the resulting layer. It describes how vacuum evaporation works and its individual parts.The main part deals with evaporation of copper and other substances and the conductivity of the resulting film in relation to its thickness. As a parameter for measuring substrate temperature is specified.
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Preparation of organic semiconducting thin films by vacuum evaporation
Schön, Martin ; David, Jan (referee) ; Salyk, Ota (advisor)
This thesis deals with preparation of organic molecular thin film compounds and its properties like morphology and purity. The vapour deposition was used for thin films preparation, because used materials are very few soluble. Thin films properties were characterized with the infrared spectroscopy (FTIR) and scanning electron microscope. There are described basics of infrared spectroscopy, spectra measurement and interpretation in the theoretical part. Process of thin film preparation is also described in this part. In the experimental part are described used vacuum technology and measuring instruments, process of sample measurement and there is the list of studied materials. 12 derivates of diketopyrrolopyrrols (DPP) were studied in this thesis. Diketopyrrolopyrroles (DPP) and its derivates have interesting chemical and physical properties, expecting wide range of applications, especially in electronics industry.
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Mechanical and Electrical Properties of Thin Metal Films Deposited by Vacuum Evaporation
W. F. Yahya, Doaa ; Kolařík, Vladimír (referee) ; Štencl,, Jiří (referee) ; Šandera, Josef (advisor)
Thin layers are widely used in many fields of technology and today we can say that they are found in all modern technologies. Thin layers can be created in two ways, namely by chemical or physical means. This work focuses on the latter method, more particularly a technology of thermal evaporation of thin layers in a vacuum. The work focuses on the process principles during and after the evaporation. Much of the work focuses on the development and design of experiments. These experiments illustrate some of the phenomena that take place on thin films produced by the aforementioned technology. Work helps to better understand processes during formation of thin layers and properties that influence the quality and stability of thin films. In conclusion we describe results of experiments and new developments in the field of thin films deposition using evaporation under vakuum are summarized.
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Vacuum evaporation efficiency improvement
Havlásek, Martin ; Máša, Vítězslav (referee) ; Vondra, Marek (advisor)
This thesis is focused on experimental work in the domain of vacuum evaporation efficiency improvement. The first part introduces theory of liquids evaporation and its influencing factors, then multi-stage flash distillation technology. The next part of theory is an overview of other technologies used for desalination of sea water and introduction to the design of experiments. In the practical part are selected factors affecting efficiency of device and experiment plan is designed for them. When the experiment is done, optimal operating conditions of technology are designed on basis of analysis.
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Treatment of thickened sludge from industrial wastewater
Peťovský, Patrik ; Procházková, Michaela (referee) ; Vondra, Marek (advisor)
The aim of the thesis is to present the problem of industrial sludge treatment and to identify and implement in laboratory conditions a suitable technology for the treatment of a specific industrial sludge, which is already partially thickened fermentation residues from the operation of biogas plants (BPS). Based on the research developed on available technologies for the treatment of waste sludge, the mixed evaporator was selected as a suitable technology. The advantage is the possibility of using the low potential heat from BPS CHP units under reduced pressure, which is often thwarted. The agitator in the evaporator ensures homogenization while increasing densification. The use of the technology results in a reduction in the volume of fermentation residues. The main part of the thesis deals with the design and implementation of a stirred evaporator for production. Experimental The plant was constructed on the premises of the LENP (Laboratory of Energy-Intensive Processes) at the Brno University of Technology. During operation, the functionality of the device and its applicability to several types of waste sludge were verified. The experimental results are mainly focused on the properties and behaviour of the fugate, or liquid fraction, of the fermentation residues. The fugate was concentrated from a raw state of 5.4 % dryness to a value of 20.9 % dryness, at which point it becomes a highly viscous and poorly flowing material. In an industrial plant where waste heat is wasted, a stirred evaporator may be a suitable device for sludge treatment or volume reduction. This leads to lower costs for storage, transport, and application as fertilizer to fields. With a suitable evaporator and agitator design, the evaporation principle can be used for less and more concentrated waste sludge. The resulting thickened product can then be fed to the finishing operations, allowing the distillate to be finished.
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DESIGN, DEPOSITON TECHNOLOGY AND CHARACTERIZATION OF THIN OPTICAL COATINGS FOR SPECIAL APPLICATIONS
Oulehla, Jindřich ; Kozák,, Martin (referee) ; Žídek,, Karel (referee) ; Sobola, Dinara (advisor)
The physical phenomena resulting from thin film optics have been known for several centuries. The oldest discovery which can be considered as modern day thin film optics is what is now called the Newton rings. The explanation of this phenomenon is quite simple, it is the interference of light on a thin film. However in the time of its discovery, due to the level of knowledge of optics, its explanation wasn’t possible for the next hundred and fifty years. The works of Augustin Jean Fresnel have been particularly important for the field of optics. He combined the results Young’s double slit experiment with Huygens’ ideas of light propagation into one theory – the theory of diffraction. The Frenel’s laws which govern the propagation of amplitude and phase of light reflected or transmitted over a boundary are essential. These laws along with the discoveries of his contemporaries (i.e. Siméon Denis Poisson) and followers (especially James Clerk Maxwell) are the foundations of thin film optics. Optical thin film technology went through rapid development in the 1930’s. Even though the principles of sputtering come from approx. half of the nineteenth century and the principles of vacuum evaporation come from the turn of the nineteenth century, these techniques were not considered useful production techniques especially because of the lack of usable pumping systems. It was the research in the area of diffusion pumps (and oils) in the 1930’s which made these techniques useful. Since then there has been a great technological development of these techniques, particularly towards the end of the last century. During the same period new requirements for the optical thin film properties have appeared. Not only were they required to perform well in the area of reflectance and transmittance but also to be able to withstand high intensity laser radiation. There is still a wide range of scientific and technological opportunities in the field of optical thin film production not only in the form of finding new materials or novel coating techniques but also in the usage of standardized technology for special and unique applications.
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SMV-2019-04: Large-area nanostructures preparing
Horáček, Miroslav ; Kolařík, Vladimír ; Matějka, Milan ; Krátký, Stanislav ; Chlumská, Jana ; Meluzín, Petr ; Král, Stanislav
The development of sandwich nanostructures on doped silicon substrate. The dimension of nanostructures and their pitch is very close to the capability of used e-beam system Raith EBPG5000+. Thin silicon nitride layer was prepared on doped silicon substrate. This layer is needed for wet etching of silicon. The golden markers needed for direct writing of multiple patterns were prepared by the way of e-beam lithography and vacuum evaporation. Mask in the resist layer was exposed for etching of the silicon nitride mask by reactive ion etching in the next step. Wet etching of silicon was carried out after the mask was prepared. Small pyramids were created by the etching process. The last lithography step was preparation of the mask over the pyramids. Thin aluminum layer in the areas where the pyramids are presented was prepared by the way of vacuum evaporation and lift-off technique.
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Feedhorn Coating - research report
Václavík, Jan
The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT layer. The report contains the results and comments for future construction of similar types of devices.
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Properties of metal layers realized with vapour deposition
Milichovský, Miloš ; Švecová, Olga (referee) ; Šandera, Josef (advisor)
This work deals with vacuum evaporation of metals, basic principles of this technology and exploring the properties of the resulting layer. It describes how vacuum evaporation works and its individual parts.The main part deals with evaporation of copper and other substances and the conductivity of the resulting film in relation to its thickness. As a parameter for measuring substrate temperature is specified.
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Mechanical and Electrical Properties of Thin Metal Films Deposited by Vacuum Evaporation
W. F. Yahya, Doaa ; Kolařík, Vladimír (referee) ; Štencl,, Jiří (referee) ; Šandera, Josef (advisor)
Thin layers are widely used in many fields of technology and today we can say that they are found in all modern technologies. Thin layers can be created in two ways, namely by chemical or physical means. This work focuses on the latter method, more particularly a technology of thermal evaporation of thin layers in a vacuum. The work focuses on the process principles during and after the evaporation. Much of the work focuses on the development and design of experiments. These experiments illustrate some of the phenomena that take place on thin films produced by the aforementioned technology. Work helps to better understand processes during formation of thin layers and properties that influence the quality and stability of thin films. In conclusion we describe results of experiments and new developments in the field of thin films deposition using evaporation under vakuum are summarized.
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