Browsing by Author "Špatenka, Petr"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
- ItemDepozice speciálních funkčních vrstev a jejich testování(Technická Univerzita v Liberci, 2009) Horáková, Marta; Špatenka, PetrCílem disertační práce bylo vytvoření fotokatalyticky aktivních TiOx vrstev za nízkých depozičních teplot.
- ItemFotokatalytické účinky TiO2 vrstev připravovaných plazmochemickou depozicí z plynné fáze (PECVD)(Technická Univerzita v Liberci, 2007) Hájková, Pavlína; Špatenka, Petr
- ItemPhotocatalytic Activity of Nanostructured Titanium Dioxide Thin Films(Hindawi Publishing Corporation, 2012) Michalčík, Zdeněk; Horáková, Marta; Špatenka, Petr; Klementová, Šárka; Zlamal, Martin; Martin, NicolasThe aim of this paper is to investigate the properties and photocatalytic activity of nanostructured TiO2 layers. The glancing angle deposition method with DC sputtering at low temperature was applied for deposition of the layers with various columnar structures. The thin-film structure and surface morphology were analyzed by XRD, SEM, and AFM analyses. The photocatalytic activity of the films was determined by the rate constant of the decomposition of the Acid Orange 7. In dependence on the glancing angle deposition parameters, three types of columnar structures were obtained. The films feature anatase/rutile and/or amorphous structures depending on the film architecture and deposition method. All the films give the evidence of the photocatalytic activity, even those without proved anatase or rutile structure presence. The impact of columnar boundary in perspective of the photocatalytic activity of nanostructured TiO2 layers was discussed as the possible factor supporting the photocatalytic activity.
- ItemProduction and Properties of Biopolymer composites using natural cellulose fibres and reinforcement(Technická Univerzita v Liberci, 2007) Vacková, Taťana; Špatenka, Petr
- ItemSurface Functionalization of Polyethylene Granules by Treatment with Low-Pressure Air Plasma(MDPI, 2019-05-25) Šourková, Hana; Primc, Gregor; Špatenka, PetrPolyethylene granules of diameter 2 mm were treated with a low-pressure weakly ionized air plasma created in a metallic chamber by a pulsed microwave discharge of pulse duration 180 µs and duty cycle 70%. Optical emission spectroscopy showed rich bands of neutral nitrogen molecules and weak O-atom transitions, but the emission from N atoms was below the detection limit. The density of O atoms in the plasma above the samples was measured with a cobalt catalytic probe and exhibited a broad peak at the pressure of 80 Pa, where it was about 2.3 × 1021 m−3 . The samples were characterized by X-ray photoelectron spectroscopy. Survey spectra showed oxygen on the surface, while the nitrogen concentration remained below the detection limit for all conditions. The high-resolution C1s peaks revealed formation of various functional groups rather independently from treatment parameters. The results were explained by extensive dissociation of oxygen molecules in the gaseous plasma and negligible flux of N atoms on the polymer surface.