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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Transport Properties of PVA Hydrogels
 Nádvorník, Filip ; Trudičová, Monika (referee) ; Kalina, Michal (advisor)
This bachelor thesis focuses on the study of transport properties of PVA hydrogels. The preparation of PVA hydrogels was optimized using rheological tests and visual observation. The freeze – thawing method was used for the PVA gelation process. Probes carrying a charge on functional groups in aqueous media, namely methylene blue, eosin and riboflavin, were incorporated into PVA hydrogels during the preparation. The mechanical properties of these hydrogels were compared with those of pure PVA hydrogels. Diffusion tests were then carried out where the given dye was monitored from the hydrogel into the surrounding environment using UV-VIS spectroscopy. The obtained results showed that the hydrogel containing the probe with a positive partial charge (methylene blue) showed the greatest willingness to release the dye, while the hydrogel containing the probe without the charge (riboflavin) was released into the environment minimally.
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Looking into the Photo-stability of Eosin by Electrochemical Methods
 Sabatini, F. ; Sokolová, Romana ; Degano, I.
Eosin Y is a synthetic organic dye belonging to the xanthene family. Its bright and fluorescent\npink hue attracted and intrigued the painters of the 19th century, who experimented eosin as\npigment lake (often called Geranium lake) in their paintings. Nevertheless, eosin coloration is\nas beautiful as unstable, and examples of work of arts with faded hues have been documented.\nEosin is not only photo-sensitive but also pH sensitive, making its study very complex. In this\nwork, the combination of electrochemical and spectroscopic techniques revealed to be effective\nfor correlating the physical evidence of eosin fading with its chemical degradation.
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