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2 2009

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An XPS study of RF sputtered Ti1-x FexO2-delta thin films

100%

Dumitru L. , Apetrei R. , Dobromir M. , Dascaleanu V. , Teodorescu C. M.

tom Vol. 3, No. 4

15-17

Introduction of small amounts of dopant Fe cations intitania was mainly intended for improving the oxidativepower of the host TiO2 surface, by shifting the absorption edge of the material towards the blue side of the visible range. Apart from this, other possible applications of Fe-containing TiO2 materials have been foreseen in the field of diluted ferromagnetic semiconductors for spintronics. As a general remark, while pristine and/or low-level doped titania materials remained a hot subject in basic research, and environment- and energy related applications, reports on Ti1-x FexO2 materials (x > 0.1) scarcely occurred in literature. We have initiated recently an investigation of heavily doped titania thin films within a wider iron compositionrange. Here, we report on the result of an XPS study of the RF sputtered oxygen-deficient thin films (x =0.15 - 0.62) and discuss the connection of the results with the macroscopic properties of the materials.

Highly thermostable exopolysaccharide produced by the moderately halophilic bacterium isolated from a man-made young salt lake in Romania

86%

Cojoc R. , Merciu S. , Oancea P. , Pincu E. , Dumitru L. , Enache M.

Polish Journal of Microbiology

2009

tom 58

nr 4

289-294

Halophilic bacterial strains isolated from a man-made salt lake in Romania produce a specific exopolysaccharide. This product is synthesized under both static and stirring conditions, and the yield of this exoploysaccharide depends on the composition of the culture medium. The highest amount of polymer was obtained in the presence of casamino acids and yeast extract, under stirring conditions. This polymer has high thermostability, with a melting point at 207°C. The melting process is associated with the thermal degradation of the compound. This polymer is characterized by maximum absorbtion at 260 nm and fluorescence emission at 530 nm. The FT-IR analysis of the polymer revealed the presence of a saccharide structure and of amine and sulfate groups throughout the sugar backbone.