An invited talk at the international conference »The 15th International Conference of Physical Chemistry – ROMPHYCHEM15«, 11.13. 9. 2013, Bucharest, Romania. The talk was divided into two parts; (i) synthesis with the focus on the impact of reaction temperature on manganese distribution in the products and on morphology of titanate nanostructures, and (ii) transformation of titanate nanostructures doped with Mn2+ and the study of oxidations states of manganese in TiO2 nanostructures and as well study of manganese local environment in these nanostructures.
B.04 Guest lecture
COBISS.SI-ID: 27035943Invited lecture for undergraduated students at Universitat Rovira i Virgili, Tarragona, Spain within annual meeting »Student Meeting on Electronic Engineering, Junij 20-21, 2012«. It was presented a development of hydrothermal synthesis and its industrial importance. In few examples the imapct of reaction conditons on morpohology and dimensions synthesizedf nanoparticles was discoused.
B.04 Guest lecture
COBISS.SI-ID: 25955623In the lecture at the 4th International conference on Nano-Structures Self-Assembly, Italy the synthesis of sodium titanate nanoribbons doped with Co2+ was presented. The local coordiantion and oxidation states of cobalt ions was determained by several different characterization techniques: HAADF-STEM in combination with EEL spectroscopy, XRD, EPR, XPS and magnetic measurments. See 6.2..
B.03 Paper at an international scientific conference
COBISS.SI-ID: 25956135Protonated titanate nanoribbons were transformed to anatase NRs by calcination in air, hydrothermal treatment in an autoclave, and microwave-assisted hydrothermal treatment. Obtained products were characterized with electron microscopy (SEM and TEM), thermogravimetric analysis (TGA) and specific surface area analysis (BET). SEM investigation revealed that the transformation conditions did not affect the nanoribbon morphology but had a strong impact on the nanoribbon surface. Surface of the NRs transformed under hydrothermal conditions became rougher. The change of the surface was also reflected in an increased surface area (BET) and therefore in a larger amount of surface hydroxyl (-OH) groups (TGA) in comparison to the product obtained by calcination in air. Surface of anatase NRs was functionalized with silanes. Influence of solvent (water and ethanol), presence of a catalyst (NH3(aq)), and a number of hydrolysable groups of silane (3-aminopropyltriethoxysilane and 3-aminopropyldiethoxymethylsilane) was examined. Functionalized anatase NRs were characterized with diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and X-ray photoelectron spectroscopy (XPS). XPS analyses elucidated that anatase NRs were the best functionalized in water without the catalyst with the silane with three hydrolysable groups. As expected, the anatase NRs with a larger amount of hydroxyl groups were more efficiently grafted with silanes than the product obtained by calcination in air. Such functionalized anatase NRs will be used for further composite synthesis.
B.06 Other
COBISS.SI-ID: 27547175