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Fotokatalytické technologie a nové nanopovrchové materiály v roce 2005
Peterka, F. ; Jirkovský, Jaromír ; Šubrt, Jan ; Špatenka, P. ; Krýsa, J. ; Lukeš, Petr ; Kavan, Ladislav ; Štengl, Václav ; Kolouch, A. ; Klusoň, P.
Current state of art in the research and development of photocatalytic titanium oxide nanosurface materials and their practical applications is discussed. The main objectives of new European COST Action “PHONASUM” (COST 540), which is understand as European platform to group the existing European collaborations and to allow for a large exchange between the different European groups focussing on the development of photocatalytical nanomaterials and standard photoactivity testing methods are presented. Specific aims and scientific results of the Research Centre for Nanosurface Engineering "NANOPIN" established in 2005 under the Research and Development Program of the Ministry of Education, Youth and Sports of the Czech Republic are shown in more detail.
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Photocatalytic activity of titanium precursors treated in low temperature plasma
Brožek, Vlastimil ; Matějíček, Jiří ; Šrank, Z. ; Mastný, L. ; Janča, J.
In order to obtain compact photocatalytically active materials, the possibility of preparation of new titania forms by oxidation of titanium compounds, having different crystal structures and oxidation degree, was verified. Four model substances were chosen: titanium carbide, nitride, diboride and Ti2O3. These compounds were prepared in the form of high-specific-surface powder, as well as large-area compact free-standing parts by CVD, PVD and especially plasma spraying. After high temperature treatment in a water stabilized plasma, generated by the WSP torch, a measurable photoactivity was observed; this could be further improved by controlled oxidation below 450°C. Oxidation in an RF-generated oxygen plasma appeared more efficient, especially in shorter reaction times. However, the experiments have shown that even keeping the reactor walls at 450°C did not prevent the uncontrolled temperature rise inside, during the reaction of the oxygen plasma with titanium compounds.
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