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Preparation and characterization of catanionic complexes
Mušková, Alexandra ; Kalina, Michal (referee) ; Mravec, Filip (advisor)
The diploma thesis deals with the preparation and characterization of catanionic complexes and their possible application to pharmaceutics and medicine. The catanionic complexes were prepared by mixing two oppositely charged surfactants with the concentration of 20 mmol·dm3 in various volume ratios. Two systems were analyzed – CTAB + SDS and Septonex + SDS. Both systems were prepared in an aqueous and physiological environment. The turbidimetric analyses provided results of the intensity of turbidity of the prepared mixtures. The size and stability of the prepared particles were determined by DLS and ELS measurements. CTAB-rich samples showed significant viscosity changes and they were therefore characterized by rheological measurements. The results of this work show that the asymmetry of alkyl chains, surfactant selection, temperature, and ionic strength have a significant influence on the properties and self-assembly of surfactants in catanionic complexes.
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Bigels - Preparation and Characterization
Mušková, Alexandra ; Krouská, Jitka (referee) ; Mravec, Filip (advisor)
This bachelor thesis deals with study of bigels, which are composed of hydrogel and oleogel. The aim of this work is to prepare and characterize bigels. Preparation of hydrogels was based on interaction between hyaluronan and cationic surfactant carbethopendecinium bromide. Oleogels were prepared by mixing a non-ionic surfactant (sorbitan monopalmitate) with sunflower oil. Individual bigels were prepared by mixing the various rations of hydrogel and oleogel, and were characterized using a fluorescence microscope and rheological measurements. Fluorescence observations were done on prepared samples using Nile Red, Perylene, HPTS, ATTO 655 and fluorescein. Rheological experiments show that pure oleogel is the strongest and most solid in comparison with bigels and hydrogels. The greater amount of oleogel in system is, the stronger bigel is.
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Preparation and characterization of catanionic complexes
Mušková, Alexandra ; Kalina, Michal (referee) ; Mravec, Filip (advisor)
The diploma thesis deals with the preparation and characterization of catanionic complexes and their possible application to pharmaceutics and medicine. The catanionic complexes were prepared by mixing two oppositely charged surfactants with the concentration of 20 mmol·dm3 in various volume ratios. Two systems were analyzed – CTAB + SDS and Septonex + SDS. Both systems were prepared in an aqueous and physiological environment. The turbidimetric analyses provided results of the intensity of turbidity of the prepared mixtures. The size and stability of the prepared particles were determined by DLS and ELS measurements. CTAB-rich samples showed significant viscosity changes and they were therefore characterized by rheological measurements. The results of this work show that the asymmetry of alkyl chains, surfactant selection, temperature, and ionic strength have a significant influence on the properties and self-assembly of surfactants in catanionic complexes.
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Bigels - Preparation and Characterization
Mušková, Alexandra ; Krouská, Jitka (referee) ; Mravec, Filip (advisor)
This bachelor thesis deals with study of bigels, which are composed of hydrogel and oleogel. The aim of this work is to prepare and characterize bigels. Preparation of hydrogels was based on interaction between hyaluronan and cationic surfactant carbethopendecinium bromide. Oleogels were prepared by mixing a non-ionic surfactant (sorbitan monopalmitate) with sunflower oil. Individual bigels were prepared by mixing the various rations of hydrogel and oleogel, and were characterized using a fluorescence microscope and rheological measurements. Fluorescence observations were done on prepared samples using Nile Red, Perylene, HPTS, ATTO 655 and fluorescein. Rheological experiments show that pure oleogel is the strongest and most solid in comparison with bigels and hydrogels. The greater amount of oleogel in system is, the stronger bigel is.
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