|
|
Study of Thiophene Oligo-copolymers: Synthesis and Optoelectronic Properties
Krajčovič, Jozef ; Mazal,, Ctibor (referee) ; Kapička, Vratislav (referee) ; Friedl, Zdeněk (advisor)
Thesis presents synthesis and study of thiophene monomers, oligomers and polymers. The new series of thieno[3,4-b]pyrazine copolymers based on 3-dodecylthiophene and pyrazine monomers were prepared by oxidative polymerization with FeCl3. The effective synthetic method for preparation of 3-alkylthiophenes and thiophene oligomers was developed by optimizing of Kumada cross-couplig. The mentioned method could be realized for multikilos scale with possibility of transfer to pilot plant production. The second part of thesis focuses on synthesis and study of new thiophene compounds, which consist of both 2,3-diazo-1,3-butadiene bridge with two terminal chromophores and two thiophene units linked together via -position by pyrazine or hydrazine bridge. Finally, the new type of regular alternating copolymer consists of 2,2´:5´,2´´-terthiophene-5,5´-dicarboxylic acid (TEDA) and polyethyleneoxide (PEO) was prepared. Formation of polymer nano-subunits as separated phases in solid state was confirmed by TEM.
|
|
| |
|
|
Monitoring of photocatalytic activity using redox dyes
Uhrová, Ivana ; Drbohlavová, Jana (referee) ; Veselý, Michal (advisor)
The bachelor thesis deals with assessment of photocatalytic activity of titanium dioxide. The easiest and simultaneously the quickest way is bleaching of indicator ink based on redox dye. The theoretical part contains characteristics of several similar dyes and a description of ink-structure effect on total bleaching speed. The experimental part elaborately describes bleaching of indicator ink based on redox dye 2,6 dichloroindophenol, depending on the number of ink layers on photocatalytic active surface as well as on total amount of glycerol.
|
|
|
Photocatalytic properties of hybrid titania-silica layers
Zbořilová, Zdeňka ; Pekárková, Jana (referee) ; Dzik, Petr (advisor)
This diploma thesis is focused on the preparation of hybrid titania-silica layers. Titanium tetraisopropoxide and tetraethyl orthosilicate with Levasil were used as the precursors for TiO2 and SiO2 synthesis, respectively. The layers were deposited on substrates by material printing. Furthermore, this work is focused on study of the photocatalytic activity of prepared titania/silica hybrid layers. Photocatalytic activity of prepared layers was studied by measuring the oxidation of 2,6-dichlorindofenolu, oxidative degradation of stearic acid and oxidation of terephthalic acid. The influence of hybrid layers number on the photocatalytic activity was investigated.
|
|
|
Photocatalytic activity of titania multilayer printed structures
Potočková, Lucie ; Pekárková, Jana (referee) ; Dzik, Petr (advisor)
This thesis deals with the preparation of titanium dioxide films by the sol-gel process. Films were deposited by material printing on soda-lime glass plates. The thickness of layers was directed by repeated printing. Thus were prepared multi-layered TiO2 coatings. The surface topology of films was investigated by optical microscopy and scanning electron microscopy. The photocatalytic activity of these coatings was studied on a model compound 2,6-dichlorineindophenol. The influence of the number of TiO2 layers and the intensity of UV irradiation on the size of 2,6-dichlorineindophenol degradation rate constant was monitored. The photo-induced hydrophilic properties of prepared coatings were studied as well.
|
|
| |
|
|
Design of AD converter with low supply voltage in CMOS technology
Holas, Jiří ; Háze, Jiří (referee) ; Kledrowetz, Vilém (advisor)
Tato diplomová práce se zabývá návrhem 12 bitového řetězového A/D převodníku. Součástí návrhu bylo vytvořit referenční model převodníku v prostředí Matlab a determinovat faktory, které negativně ovlivňují výsledek konverze. S využitím nabytých poznatků navrhnout řetězový převodník na transistorové úrovni v prostředí Cadence. V teoretické části jsou shrnuty základy A/D převodu a dále jsou představeny nejčastěji používané architektury A/D převodníků. V dalších částech je popsán a diskutován vliv neidealit na vlastnosti řetězových převodníků. Praktická část se již věnuje popisu základních charakteristik řetězových převodníků a dokazuje funkci modelu. Z výsledků modelové struktury byly stanoveny reálné parametry, které byly dále využity v procesu tvorby návrhu v CMOS technologii TSMC 0,18m s nízkým napájecím napětím.
|
|
|
Data logger
Albert, Matej ; Šandera, Josef (referee) ; Šteffan, Pavel (advisor)
This bachelosr’s thesis is about designing and construction of data logger for laboratory purposes. The goal is to construct such a station with possibility to connect multiple wireless sensors, with ability to measure various data, like temperature, humidity or pressure. The wirelles sensor will be powered by battery. The station will be operated remotely, for example from personal computer.
|
|
|
Synthesis and study of fluorinated organic materials for electronic and optoelectronic applications
Halaksa, Roman ; Pospíšilík, Karel (referee) ; Krajčovič, Jozef (advisor)
This essay deals with polyfluorinated aromatic compounds, as a strong electronacceptor units and with its incorporation into advanced monomeric and oligomeric systems. It deals with theoretical aspects of structure of mentioned building units, which shove, that it could be really progressive. Also examples of so far synthesized molecules, that can be found in literature, are included. The second part of essay deals with synthesis of main intermediates via Kumada cross-coupling and with synthesis of tetrafluorophenylene bridged thiophene trimmers via Stille cross-coupling.
|
|
|
Administrative and storage building in Kunratice, implementation of carcass substructure
Herůfek, Marek ; Liška, Pavel (referee) ; Kovářová, Barbora (advisor)
Content of bachelor work is civil-technological project of substructure in administrative and storage object in Kunratice close to Praha. Project contains technological prescriptions of drilled piles, groundwork and lime stabilisation. Another parts are inspection and testing plans, situation of building with wide detentions of transport routes, bill of quantities, schedule of work, catalog of mechanization, safety during work and organization of construction.
|
guest ::
