Program and the Book of Abstracts (PDF) - Mrs-serbia.org.rs

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Tenth Young Researchers Conference – Materials Science and Engineering December 21-23, 2011, Hall 2, SASA, Knez Mihailova 35 & 36, Belgrade, Serbia VIII/7 Thin transparent conductive graphene films with PVP Duška Kleut 1 , Dejan Kepić 1 , Zoran Marković 1 , Ivanka Holclajtner Antunović 2 , Davor Peruško 1 , Biljana Todorović Marković 1 1 Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia, 2 Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia Thin transparent conductive films were made on glass slides from chemically exfoliated graphene using vacuum filtration technology. Polyvinylpyrolidone was used as a surfactant for obtaining aqueous solutions of individual graphene sheets in the exfoliation process through ultrasonication. Optical and structural characteristics of the films were studied with different microscopy and spectroscopy methods and they proved to be conductive and transparent up to 95%. Films were further gamma irradiated in attempt to improve their electrical properties. Irradiation improved the conductivity and quality of the films by reducing contact resistance between graphene sheets. 35

Tenth Young Researchers Conference – Materials Science and Engineering December 21-23, 2011, Hall 2, SASA, Knez Mihailova 35 & 36, Belgrade, Serbia IX/1 Z-scan measurement of nonlinear optical properties Ana Joža, Bojan Dakić, Dragan Z. Stupar, Jovan Bajić, Miloš P. Slankamenac, Miloš Živanov University of Novi Sad, Faculty of Technical Sciences, Novi Sad, Serbia This paper presents measurement of nonlinear optical properties of materials by using single beam z-scan technique. Theoretical explanation of the technique and experimental results are given. As a light source continuous wave green laser at 532 nm is used. The sample of a material is moved along z-axis in range of 15 cm experiencing different levels of irradiance. This technique is based on separate measurements of light transmission and absorption through material, with and without aperture, respectively. The results are fitted by using LabVIEW software in order to obtain nonlinear refractive index and nonlinear absorption coefficient of the investigated material. IX/2 Pelletized fly ash – a new aggregate for lightweight concrete Dragoljub Birčević 1 , Sanja Bajić 1 , Radmila Gaćina 1 , Lukaš Koval 2 , Rudolf Tomanec 1 1 Faculty of Mining and Geology, University of Belgrade, Serbia, 2 Technical University Ostrava, Czech Republic This work presents detailed characterization of fly ash from the Nikola Tesla Steam Power Plant B, Obrenovac, Serbia, and the ash pelletization process using Portland cement and bentonite clay binders in 5 ÷ 35 percent proportions. Each pellet-size fractions is tested on the compressive strength, impact strength, attrition and other mechanical properties. Pellets produced using bentonite are calcified and sintered at the temperature of 1100ºC. Finally, the recommended applications of palletized fly ash are the aggregate for lightweight concrete in the building-materials industry, in agriculture, for soil stabilization in landfills, or in landscaping. 36

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