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Biopolymer particles based on polyhydroxybutyrate
Gregušková, Zuzana ; Zemanová, Jana (referee) ; Přikryl, Radek (advisor)
This Bachelor´s thesis deals with preparation of abrasive particles from poly(3-hydroxybutyrate) and their optimization for cosmetics usage. It explores morphology of prepared particles and its effect on their abrasive ability. Moreover, it compares abrasive effectiveness of prepared particles with those commercially available. Several types of preparation methods of biopolymer particles such as milling, fibre spinning, pelletisation and solution preparation were carried out and optimized. Prepared particles were analysed using scanning electron microscopy. Semi-automatic system for testing of abrasiveness of prepared particles was made up from basic parts of 3D printing machine. This device was tested and calibrated using floral foam and sandpaper with different grades of granularity and used for comparison of abrasiveness of prepared particles. Mechanical response of particles under pressure was also investigated. It was found out that measured mechanical properties correlate with the data from abrasiveness test. Size and shape of particles, their morphology, mechanical properties and abrasiveness can be controlled depending on the preparation method used. Selected prepared and commercial abrasive particles were applied into prepared cosmetic foundations for peeling with the goal of sensory evaluation of abrasive effectiveness of prepared particles.
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Study the concrete abrasion process by water
Boucníková, Veronika ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The master thesis is focused on resistance of concrete against to effects of flowing water. In the theoretical part of the thesis mechanical and chemical effects of flowing water were described. The research of aspects that affects resistance of concrete against flowing water was done. Futhermore, the methods that evaluated resistance of concrete against flowing water were described. In the experimental part of the thesis the effect of concrete composition on resistance against mechanical and water abrasion was observed. Abrasive and plain high-speed water jet was used to simulate the effects of water abrasion. After interaction of concrete and water jet the relief and volume loss of material were observed.
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Biopolymer particles based on polyhydroxybutyrate
Gregušková, Zuzana ; Zemanová, Jana (referee) ; Přikryl, Radek (advisor)
This Bachelor´s thesis deals with preparation of abrasive particles from poly(3-hydroxybutyrate) and their optimization for cosmetics usage. It explores morphology of prepared particles and its effect on their abrasive ability. Moreover, it compares abrasive effectiveness of prepared particles with those commercially available. Several types of preparation methods of biopolymer particles such as milling, fibre spinning, pelletisation and solution preparation were carried out and optimized. Prepared particles were analysed using scanning electron microscopy. Semi-automatic system for testing of abrasiveness of prepared particles was made up from basic parts of 3D printing machine. This device was tested and calibrated using floral foam and sandpaper with different grades of granularity and used for comparison of abrasiveness of prepared particles. Mechanical response of particles under pressure was also investigated. It was found out that measured mechanical properties correlate with the data from abrasiveness test. Size and shape of particles, their morphology, mechanical properties and abrasiveness can be controlled depending on the preparation method used. Selected prepared and commercial abrasive particles were applied into prepared cosmetic foundations for peeling with the goal of sensory evaluation of abrasive effectiveness of prepared particles.
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