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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Modification of nanoparticles by means of tubular sputtering system
 Kretková, Tereza ; Hanuš, Jan (advisor) ; Matoušek, Jindřich (referee)
The aim of this work is to prepare heterogeneous nanoparticles which means nanoparticles composed of more than one material. Our approach lies in in-flight modification of primary nanoparticles in the tubular sputtering system. Our tubular system contains copper target and we deposit copper onto the flying primary nanoparticles by magnetron sputtering. The main advantage of this approach is independence of fabrication of primary nanoparticles and their subsequent modification. At first we optimized fabrication of nanoparticles by the gas aggregation source on behalf of the next modification. We also characterized conditions in the tubular sputtering system. We found process in the tubular system to be very complex and sensitive to the changes of the operational parameters. There is a strong interaction between flying nanoparticles and the discharge in the tubular system. Due to this interaction the nanoparticles are trapped in the plasma and the deposition rate is pulsing. The result of this work is modification of nickel and silver nanoparticles, preparation of heterogeneous nanoparticles Ni/Cu and Ag/Cu. These heterogeneous nanoparticles vary in composition, shape and size according to the conditions in the tubular system. We also successfully prepared Janus nanoparticles which are interesting for their...
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Modification of polymeric materials by means of atmospheric plasma for biomedical applications
 Kretková, Tereza ; Kylián, Ondřej (advisor) ; Hanuš, Jan (referee)
Polymeric materials are thanks to their advantageous volume properties and due to their relatively low price interesting for various applications. However, the possible use of common polymers is hampered by their low surface energy that leads to poor adhesion of subsequent coatings and limited ability to bind biomolecules. One of the strategies to increase the surface energy is modification of polymer surface by atmospheric plasma. In this study, we have investigated effect of atmospheric pressure dielectric barrier discharge generated in air on poly(ether-ether-ketone). We estimated plasma composition by optical emission spectroscopy as well as monitored temperature of the polymer during the treatment in order to verify applicability of this plasma source. Subsequently changes in morphology, chemical composition and surface energy of polymeric samples after the plasma treatment were determined. We proved that surface energy increases with increasing surface density of polar functional groups and that plasma causes changes in morphology of the studied polymer surface. We determined the etching rate of poly(ether-ether-ketone) in dependence on the supplied power. Optical properties remained unchanged indicating that also volume properties were not affected by plasma. Finally we tested the binding of...
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