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Possibilities of utilization of boiler slag
Fialová, Gabriela ; Másilko, Jiří (referee) ; Opravil, Tomáš (advisor)
This bachelor thesis studies the boiler slag (slag) and its potential use in refractory materials industry. It concentrates its on chemical and mineral composition. Mullite parts and Fe2O3 probably lowers the melting point and heat resistance. During the work is proposed and experimentally validated a method for reducing the content of iron in the slag shares.Is observed the effect of the reduced number of iron units for the heat resistance of the material. The results are further processed and assessment. Thermal resistance was monitored using incandescent microscopy.
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Preparation of uniform superparamagnetic particles with polymer coating for biomedical applications
Patsula, Vitalii ; Horák, Daniel (advisor) ; Sysel, Petr (referee) ; Matějíček, Pavel (referee)
Aim of this thesis was to design and prepare polymer-coated monodisperse Fe3O4 nanoparticles as a safe and non-toxic contrast agent for magnetic resonance imaging (MRI) and heat mediator for hyperthermia. Uniform superparamagnetic Fe3O4 nanoparticles were synthesized by thermal decomposition of Fe(III) oleate, mandelate, or glucuronate in high- boiling solvents at temperature >285 řC. Size of the particles was controlled in the range of 8- 27 nm by changing reaction parameters, i.e., temperature, type of iron precursor, and concentration of stabilizer (oleic acid and/or oleylamine), while preserving uniformity of the nanoparticles. Because particles contained hydrophobic stabilizer on the surface, they were dispersible only in organic solvents. To ensure water dispersibility, oleic acid on the particle surface was replaced by hydrophilic and biocompatible methoxy-poly(ethylene glycol) (PEG) and poly(3-O-methacryloyl-α-D-glucopyranose) by ligand exchange. Polymers were previously terminated with anchoring-end groups (hydroxamic or phosphonic) to provide firm bonding to iron atoms on the particle surface. Fe3O4 nanoparticles were also hydrophilized by encapsulation into a silica shell by reverse microemulsion method. Tetramethyl orthosilicate was used to prepare Fe3O4@SiO2 nanoparticles, which were...
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Preparation and characterization of superparamagnetic inorganic/polymer particles for biomedical application
Zasońska, Beata Anna ; Horák, Daniel (advisor) ; Šafařík, Ivo (referee) ; Sysel, Petr (referee)
Superparamagnetic -Fe2O3 nanoparticles were synthesized by coprecipitation of ferric and ferrous salts with a base. Resulting nanoparticles were coated with shells, such as poly(N,N- dimethylacrylamide) (PDMAAm), neat and functionalized silica (SiO2 and SiO2-NH2), and polyaniline (PANI). PDMAAm shell was introduced by modification of iron oxide nanoparticle surface with an initiator and N,N-dimethylacrylamide was polymerized producing -Fe2O3&PDMAAm core-shell particles. In case of SiO2-NH2 shell, tetramethyl orthosilicate was used to yield -Fe2O3&SiO2 nanoparticles, which were subsequently modified by (3-aminopropyl)triethoxysilane to prepare γ-Fe2O3&SiO2-NH2 particles. Oxidation of aniline hydrochloride with ammonium persulfate in an aqueous solution of poly(N-vinylpyrrolidone) in the presence of iron oxides produced -Fe2O3&PANI nanoparticles. Finally, the last type of the particles was based on thionin-modified poly(carboxymethyl methacrylate) (PCMMA&Th). The particles were characterized by techniques, such as scanning and transmission electron microscopy (SEM and TEM) and dynamic light scattering (DLS) to determine the particle morphology and hydrodynamic diameter. The presence of the functional groups, chemical composition, and the iron content were investigated by Fourier-transform...
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Possibilities of utilization of boiler slag
Fialová, Gabriela ; Másilko, Jiří (referee) ; Opravil, Tomáš (advisor)
This bachelor thesis studies the boiler slag (slag) and its potential use in refractory materials industry. It concentrates its on chemical and mineral composition. Mullite parts and Fe2O3 probably lowers the melting point and heat resistance. During the work is proposed and experimentally validated a method for reducing the content of iron in the slag shares.Is observed the effect of the reduced number of iron units for the heat resistance of the material. The results are further processed and assessment. Thermal resistance was monitored using incandescent microscopy.
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Design and Realization of Measuring Coils for Diagnostics Quantity of Nanoparticles in Kerosene and Identifying of Type Natural Oil
Spohner, M.
The first part describes the design of the coil to detect the concentration of iron oxide nanoparticles (0.0 % to 0.5 %) in the kerosene sample using the impedance spectroscopy method. Test coil was designed for detecting and measuring the amount of particles in the experimental design for connection to an analyzer 4294As frequency range of 40 Hz to 110 MHz. Then the samples were measured in a resonator using a wave analyzer with a frequency range of 10 MHz to 20 GHz. In view of good results, this methodology was applied to the detection and recognition of different types of oils.
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Nanokrystalické částice oxidů železa, karbidů železa a alfa-Fe připravené z ferihydritu
Schneeweiss, Oldřich ; Grygar, Tomáš ; David, Bohumil ; Pizúrová, Naděžda ; Žák, Tomáš ; Zbořil, R. ; Mašláň, M.
Preparation of nanocrystalline iron oxides (hematite alpha-Fe2O3, magnetite Fe3O4), Haag carbide (Fe5C2), and alpha-Fe by thermal treatment of ferrihydrite in various atmospheres is reported. The phase composition and size of nanoparticles was controlled using the annealing temperature and atmosphere (vacuum, hydrogen, or ethylene).
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