2003

Štengl, V.; Bakardjieva, S.; Maříková, M.; Bezdička, P.; Šubrt, J., Magnesium oxide nanoparticles prepared by ultrasound enhanced hydrolysis of Mg-alkoxides. Materials Letters 2003, 57 (24-25), 3998-4003.

Abstract: Sonochemical synthesis followed by supercritical drying was used to prepare MgO nanoparticles from Mg(OCH3)2 and Mg(OC2H5)2. Their physicochemical properties were examined by means of X-ray diffraction (XRD), simultaneous thermal analysis (DTA, TG, EGA), specific surface area measurement, scanning and transmission electron microscopy. The dehydrated MgO oxides were free of –OCH3 groups. The highest values of specific surface area (1236 m2 g−1) have been obtained by hydrolysis of magnesium methoxide using toluene as solvent agent. Link

Štengl, V.; Šubrt, J.; Bakardjieva, S.; Kalendová, A.; Kalenda, P., The preparation and characteristics of pigments based on mica coated with metal oxides. Dyes and Pigments 2003, 58 (3), 239-244.

Abstract: Intensively coloured mica pigments based on mica flakes covered with surface oxide–hydroxide layer of different metals, such as Ti, Cr, Fe, Al, Co, Ni, Zn and Cu were prepared by homogeneous precipitation of metal sulphates with urea in the presence of mica flakes. The final colour was obtained by thermal annealing of precipitates at temperature 150–800 °C. Link

Štengl, V.; Bakardjieva, S.; Maříková, M.; Šubrt, J.; Opluštil, F.; Olšanská, M., Aerogel nanoscale aluminium oxides as a destructive sorbent for mustard gas. Ceramics-Silikaty 2003, 47 (4), 175-180.

Abstract: An autoclave hypercritical drying procedure has been used to prepare alumina(a-Al2O3) precursors form aluminium sec.but-oxide C12H27AlO3. Specific surface area was 1000 m2/g. The samples were characterized by X-ray diffraction, DTA-TG, scanning and transmission electron microscopy. The precursors were taken for experimental evaluation of their reactivity with Mustard Gas (Yperite, HD agents, Bis(2-chlorethyl)sulfid). Largest percentage of the conversion mustard into non-toxic products after the elapse of the reaction was 80 %. Link

Štengl, V.; Šubrt, J.; Bakardjieva, S., Chemically modified mica. Chemicke Listy 2003, 97 (1), 45-48.

Abstract: The surface-colored mica pigment is mica chemically modified by controlled homogeneous hydrolysis of sulfates mainly of transition metals, such as Ti, Cr, Fe, Co, Ni, Zn, Al, and Cu, in the presence of urea, with possible thermal after- -treatment. Properties of the resulting pigment depend on granularity of mica, its degree of delamination, and on the thickness of the deposited metal oxide used after delamination. Flakes of colored mica were coated with metal oxide layers by homogeneous precipitation of metal sulfates with urea in aqueous medium at 95-98°C. Link

Štengl, V.; Šubrt, J.; Bezdička, P.; Maříková, M.; Bakardjieva, S., Homogeneous precipitation with urea - An easy process for making spherical hydrous metal oxides. Solid State Phenomena 2003; 90-91, 121-126.

Štengl, V.; Šubrt, J.; Bakardjieva, S.; Bezdička, R.; Kalendová, A.; Kalenda, P., Pigments based on mica coated with oxide of metals. Solid State Phenomena 2003; 90-91, 115-119.

Bakardjieva, S.; Šubrt, J.; Štengl, V.; Večerníková, E.; Bezdička, P., Comparison of photocatalytical properties of anatase and rutile TiO2 in degradation of 4-chlorophenol in aqueous solution. Solid State Phenomena 2003; 90-91, 7-12.