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Characterization and application of microwave plasma on wound healing
Smejkalová, Kateřina ; Skoumalová, Petra (referee) ; Krčma, František (advisor)
The aim of the Master thesis is the investigation of the influence of microwave discharge for skin wound healing. Microwave discharge used for this work was argon microwave plasma generated by the surface wave and direct vortex torch. The theoretical part is focused on basic information about plasma and processes that occur in plasma discharge under specific conditions. Plasma generates various active particles such as hydroxyl radicals, nitric oxide radicals, excited nitrogen molecules, atomic nitrogen, argon and oxygen. All of these particles together with plasma generated photons are usable in biomedical applications and summary of them is shown in the theoretical part. The experimental part is focused on the comparison of torch discharge and microwave plasma generated surface wave in skin wound healing. The model wounds on laboratory mousses were treated by plasma and wound healing was examined during 3 weeks after the plasma treatment. Both plasma systems showed healing acceleration. Application of torch discharge was proved to be the most effective method in the healing of skin defects. Additionally, determination of active particles was taken by optical emission spectroscopy. Based on these measurements, plasma parameters were determined: electron temparutare, rotational and vibrational temperatures. To determine role of different plasma active species, the treatment of indigo coloured artificial skin model was treated under various conditions by both plasma systems. Results show that the direct interaction between plasma particles is the main effect, role of radiation, only, is more or less negligible. Finally, the plasma vortex system was visualized using fast camera at selected powers and gas flows.
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Characterization of microwave plasma jet generated in argon-oxygen mixtures
Smejkalová, Kateřina ; Mazánková, Věra (referee) ; Krčma, František (advisor)
The optical diagnostics of microwave plasma torch operating at the frequency of 2,45 GHz is a subject of this bachelor thesis. Microwave plasma is generated using the surfatron resonator in argon with oxygen admixture (up to 1,7 %) at the constant argon flow of 3 Slm. The theoretical part gives the basic information about plasma and processes running under plasma conditions. Various active particles such as hydroxyl radicals, nitric oxides, excited nitrogen molecules, nitrogen, argon and oxygen atoms are generated in the discharge. All these particles together with the plasma generated photons can be used in biomedical applications that are briefly reviewed in the theoretical part, too. The visual observation of oxygen admixture on the discharge and the optical emission spectroscopy based determination of the active particles presence along the discharge and post-discharge axis is the subject of experimental part. Based on it, the selected plasma parameters like electron, rotational and vibrational temperatures were calculated.
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Special technical solutions in vacuum technology
SZABÓ, Robin
This thesis is focussed on the realisation of various technical solutions for microwave plasma apparatus. The theoretical part focuses on vacuum and general terms that are related. Attention was paid for example to definition of pressure, to pressure and central free track, units of measurement of pressure and their conversions. This part includes the classification of vacuum according to pressure. The next section of the dissertation is concerned with achieving vacuum including a description of rotary oil and turbo molecular pump. Part of the thesis includesa description of plasma microwave apparatus CX22 which was used during realisation of this dissertation. There is also a description of vacuum chamber, gas pump system, system of gas lead, microwave source, evaporator of liquid precursor and mixing apparatus. In the practical section a measurement of physical and technological quantity included. This part covers the inflow of apparatus measurement and temperatures of substrate during plasma process. In the next part there is a description of specific technical solutions suggested by the dissertation author. Amongst suggested technical solutions in this paper there is vacuum isolator, heating system of evaporator pipe, box of an evaporator of liquid precursor, ''gas ring'' and tablet equipment. Vacuum isolator was designed by 3D simulation and serves as a connection to detection technology. Heating of pipes of an evaporator were constructed to improve quality of the plasma process. The box of an evaporator was suggested for maintaining fresh air in a lab. A Gas ring was also designed by 3D simulation and serves as a specially adjusted pipe for bringing vapour of precursor near the substrate. The tablet equipment was constructed for unified preparation of compressed powder cellulosic tablets. Also from the available vacuum pumps, multilevel pumping was constructed that helped achievement of reduced lowest pressure.
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Plasma modification of materials for medical purposes
MATĚJÍČEK, Jan
This diploma thesis deals with the ongoing research under the auspices of the Department of Applied Physics and Technics Faculty of Education, University of South Bohemia in České Budějovice, in which the author of the work was actively participated. The thesis is divided into theoretical and experimental part. The theoretical part contains information from natural polymers, especially cellulose, plasma technology and infrared spectrometry. The subject of the experimental part of the thesis is research that deals with the functionalization of cellulose using a microwave plasma discharge on the apparatus CX-22. In the present research was also conducted to process optimization of functionalization with the liquid precursor hexamethyldisiloxane (HMDSO).
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