Vladimír Čablík

Fly ash as the component of composites materials

Abstract The fly ash from powerplant can be compared, due to its genesis, chemical and mineralogical composition with the natural volcanic glasses and minerals generated in the process of devitrification in situ. Its quality is comparable to non-metallic alumosilicate raw materials that are commercially used in building and ceramic industry. Two possibilities of fly ash utilization as the most bulk waste produced by anthropogenic activity were examined. The way of fly ashes utilization in the modeling of mixtures for the high refractory mullite corundum materials synthesis was examined. In this experiment 95.5% conversion of the input components of fly ash and Al additive in the ratio 1:1 on the mullite and corundum was obtained.

Microwave-assisted synthesis and characterization of antibacterial O-crosslinked chitosan hydrogels doped with TiO2 nanoparticles for skin regeneration

Abstract Tissue engineering provides alternative solutions to traditional transplantation. In this study a novel strategy of chitosan scaffolds obtainment based on selective O-crosslinking using Aspartic acid and the addition of TiO2 nanoparticles is presented. Prepared under microwave conditions biomaterials were of increased mechanical and thermal durability thanks to NPs presence comparing to pure chitosan. Moreover porous scaffolds maintained antimicrobial activity against S. Aureus and E. Coli. Biomaterials were susceptible to in vitro biodegradation and degradation. Hydrogels exhibited positive impact on proliferation activity of fibroblasts. Thus they may be applied as 3D scaffolds in tissue engineering focused on wound healing. GRAPHICAL ABSTRACT

Kinetyka flotacji drobnouziarnionego węgla kamiennego z kopalni Staříč za pomocą olejów popirolitycznych

Badania wykonano dzieki finansowemu wsparciu Institute of Clean Technologies for Mining and Utilization of Raw Materials for Energy Use (Ostrawa, Republika Czeska) w ramach projektu nr LO1406 oraz nr 7AMB14SK019.

Kinetics of flotation of fine grained coal from Staříč mine by using pyrolysis oils

Badania wykonano dzieki finansowemu wsparciu Institute of Clean Technologies for Mining and Utilization of Raw Materials for Energy Use (Ostrawa, Republika Czeska) w ramach projektu nr LO1406 oraz nr 7AMB14SK019.

Application of Microwave Energy at Treatment of Asbestos Cement (Eternit)

Asbestos is the common name applied to a group of natural, fibrous silicate minerals, which were once one of the most popular raw materials to be used in building materials. Asbestos was mainly used for the production of assortment asbestos cement products. Today it is generally known that asbestos belongs to the group of hazardous materials and shows carcinogenic activity. It is therefore advisable to attempt to dispose of asbestos minerals in asbestos-containing materials and to convert them into a harmless material. One of methods may be microwave thermal decomposition of asbestos minerals. The research was used for old etemit roof ceiling. X-ray analysis indicated the presence of undesirable chrysotile. Its thermal destruction was carried out in a microwave oven in the power of 2500 W. In case the heating time was 15 min, X-ray analysis was confirmed chrysotile change into harmless minerals. Thermal analysis was used for characterization and the thermal behaviour of the asbestos cement sample.