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Design of boron cluster-containing nanostructuresin solution
Fernandez Alvarez, Roberto ; Matějíček, Pavel (advisor) ; Machalová Šišková, Karolína (referee) ; Cígler, Petr (referee)
Thesis The main objective of this thesis is the study of boron cluster compounds in solution, their interaction with polymers and the formation of nanostructures. Most of the work was focused around cobalt bis(dicarbollide) (COSAN) but the incorporation of carborane into polymers was also studied. The idea was to close the knowledge gap around the way COSAN aggregates and continue the line of the laboratory in leading this topic. Therefore, we performed in-depth analysis of isothermal titration calorimetry curves to determine the aggregation number at concentrations around the critical micellar concentration (CMC). Thus, the aggregation number obtained was an improvement over previous data obtained a much higher concentration. The use of acetonitrile as a cosolvent in the micellization process helped formulate a model describing how C-H bonds in the COSAN micelles are directed towards the inside of the micelle. Furthermore, COSAN was used as a model drug for loading nanocarriers composed of hydrophobic core and charged corona. The importance of this work relies on the creation of guidelines for drug loading into similar polymeric vectors in order to determine how the nanocarrier will be affected. With the help of coarse-grained simulations, we determined that changes in the hydrophobicity of the...
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Drop coating deposition Raman spectroscopy of selected contaminants
Přikryl, Mikuláš ; Kočišová, Eva (advisor) ; Machalová Šišková, Karolína (referee)
in english: Drop coating deposition Raman spectroscopy is a special method of Raman spectroscopy based on a deposition of a small volume of solution or suspension on a special substrate with hydrophobic properties. The drop dries on this substrate and forms a deposit from which a Raman spectrum of good quality can be accumulated. This is possible in case of the small volume of deposited drop (several µl) and low initial concentration (µM) as well. The main goal of this thesis is to find the limits of this method for detection of several contaminants (melamine, picloram, thiram, bentazone) using two commercial substrates (SpectRIMTM , μ-RIMTM ) for study of aqueous solutions, and one non-commercial for study of ethanol solutions. Spectra accumulated on commercial substrates were generally of higher quality and therefore the detection limits were lower. Between the two commercial substrates, SpectRIMTM proved to be a more suitable choice due to the fact that contaminants were better concentrated on this substrate. The obtained detection limits were compared with the limits of these substances for surface enhanced Raman spectroscopy. Although the same limits were not reached, all substrates showed great potential for the detection of substances at very low concentrations.
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