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Photodecomposition of Rhodamine B on TiO2/SiO2 thin films prepared by sol-gel method

100%

Nocuń M. , Kwaśny S. , Zontek J.

tom Vol. 31, No. 1

88-94

Glasses showing catalytic effect have been of much interest recently because the catalytic layer is very effective in reducing of pollutants. The use of these glasses may bring reduction in cleaning costs. There are several methods of preparation of TiO2 with good catalytic properties, but sol-gel technique offers an opportunity to enhance catalytic effect by precise optimization of the composition and microstructure of the layer. This study concerns optimization of the composition and preparation technology of catalytic layers based on SiO2-TiO2 system. Catalytic effect was studied using Rhodamine B as a sensor. UV-VIS and photoelectron spectroscopy were the main research tools used in this study.

Synthesis, chemical characterization and antifungal activity of thin layers prepared by sol-gel method

100%

Nocun M. , Zontek J. , Kwasny S.

tom Vol. 42, nr 2

315-322

Sol-gel method was used to prepare SiO2-TiO2 thin layers on the microscope slide glasses with additions of Cu, Ag, Au compounds. The films were calcimined at 150 °C for 1 hour. We studied the morphology of the following samples by scanning electron microscopy (SEM with EDS analysis), and the X-ray photoelectron spectroscopy (XPS). Antifungal properties of the layers were tested with the use of fungi Penicyllium. The results have shown that the best antifungal effect among the examined layers has got the sample with Au ions addition.

Chow koz w Beskidach

87%

Zontek J.

1993

tom 42

nr 3

Nd3+-doped oxyfluoride glass ceramics optical fibre with SrF2 nanocrystals

75%

Reben M. , Dorosz D. , Wasylak J. , Burtan B. , Jaglarz J. , Zontek J.

tom Vol. 42, nr 2

353-364

A neodymium (Nd3+) doped oxyfluoride glass ceramics containing SrF2, LaF3 nanocrystals has been presented. Transparent glass ceramics was obtained by heat treating the glass from the SiO2-Al2O3-ZnO-Na2O-SrF2 and SiO2-Al2O3-ZnF2-Na2O-LaF3 system at the first crystal-lization temperature. Cerammization of glass was studied by DTA/DSC, XRD. It has been found that nanocrystallization of SrF2 and LaF3 strongly depends on the ratio between the components and the amount of SrF2 and LaF3, respectively. The optical studies of the glasses comprised spectrophotometry (reflectance and transmittance) and spectroscopic ellipsometry. The spectrophotometric measurements yield a number of narrow absorption bands which correspond to characteristic transitions between the ground- and consecutive excited states of rare earth ions. Growth luminescence at typical neodymium wavelength was observed under diode laser (808 nm) excitation in glass ceramics with SrF2 in comparison to parent glass. The optimization of cerammization process allowed to fabricate the oxyfluoride glass ceramics optical fibre with strong emission originated from Nd3+ ions. The influence of the cerammization process on the changes in the refractive index of glass was examined.