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AbstractAbstract
[en] This work presents a study on the synthesis and characterization of organometallic compounds of titanium oxide obtained from glow discharges of titanium tetraisopropoxide (TTIP) and water on glass and polyethylene. The objective is the synthesis of titanium oxide particles which can be fixed on different supports for use in further studies of contaminants degradation in effluent streams. The synthesis was carried out by plasma in a glass tubular reactor of 750 cm3 and 15 cm length at 10-1 mbar with power between 100 and 150 W during 2, 3 and 4 h. The precursors were TTIP and water vapor. TTIP is an organometallic compound composed of a central atom of Ti surrounded by 4 O atoms, which in turn are connected with chains of 3 C (propane s). The objective is the use of plasma collisions to separate the organic and inorganic phases of TTIP, so that both structure independently in a single material. The result was the formation of white titanium oxide powder composed with agglomerates of spherical particles with average diameter between 160 and 452 nm adhered to small films. The agglomerates have a tendency to change from film to particles with the energy applied to the synthesis. The study of the chemical structure showed a great presence of O2-Ti-O2 (Ti surrounded by O) which can be found in most titanium oxides. Other chemical groups belonging to the organic phase were C=C=C, C=C=O and C2-C-Ch appearing from the dehydrogenation of TTIP, which can be a possible precursor of this reactions kind. The structural superficial analyses showed that the atomic composition varies according to type of substrate used. The greatest content of Ti was obtained on glass substrates. However, the synthesis conditions had not evident effect in the participation of chemical states found in the inorganic phase. The crystalline studies indicated that the material is amorphous, although the de convoluted X-ray spectra showed that the synthesized titanium oxides on glass tend to anatase, while the same compounds on polyethylene tend to rutile phase. The electrical conductivity in the composites was calculated in order of 10-9 to 10-6 S/m increasing with temperature, which is a typical behavior of semiconductors. The contact angles with water on the surface of the samples were calculated from 18 to 85 C indicating that the surfaces are hydrophilic. The angles showed an inverse dependence on the synthesis time, increasing while the time reduces. (Author)
Original Title
Estructura de compuestos organometalicos obtenidos por plasma de isopropoxido de titanio
Primary Subject
Source
2012; 92 p; Thesis (chem. eng.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Report Number
Country of publication
CHALCOGENIDES, CHEMICAL REACTIONS, CONFIGURATION, ELECTRIC DISCHARGES, ELECTRICAL PROPERTIES, ELEMENTS, FLUIDS, GASES, HYDROGEN COMPOUNDS, MATERIALS, METALS, MINERALS, ORGANIC COMPOUNDS, ORGANIC POLYMERS, OXIDE MINERALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, POLYMERS, POLYOLEFINS, RADIOACTIVE MATERIALS, RADIOACTIVE MINERALS, RIVERS, SPECTRA, SURFACE WATERS, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS, VAPORS
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