The oxidation state of titanium in titanium dioxide is commonly assumed to be +4. This assignment is based on the ionic approximation and is used ubiquitously to rationalize phenomena observed with TiO2. It implies a charge state +4 and that no further oxidation of the metal center is possible. We present a comprehensive electronic structure investigation of Ti ions, TiO2 molecules, and TiO2 bu...

In this paper, Cu-Ti nanocomposite synthesized via ball milling of copper-titanium powders in 1, 3, and 6 of weight percentage compounds. The vial speed was 350 rpm and ball to powder weight ratio kept at 15:1 under Argon atmosphere, and the time of milling was 90 h. Obtained powders were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and dynamic light scattering (DLS)....

Z. Naturforsch. 54 b, 573-576 (1999); eingegangen am 28. Dezember 1998 Fused Salts, Monosilane, Methylsilanes, Hydrosilylation, Chloroaluminate Silanes of technical interest as starting compounds for semiconducting materials or hydrosi­ lylation reactions, (CH3)xSiH4_x (x = 0, 1,2, 3), are obtained by direct hydrogenation of the corresponding chlorosilanes in the presence of various interstitia...

This contribution describes the synthesis of several novel bicyclic α-amino endoperoxides, including CF(3)-substituted compounds, prepared by the aerobic electrochemical oxidation of a family of bicyclic aminocyclopropanes. These, in turn, are readily synthesised by a titanium-mediated intramolecular cyclopropanation process (Kulinkovich-de Meijere reaction), starting from N-alkenyl amides that...

Many recent studies have been reported on the photodegradation of the organic compounds in industrial wastewater in the presence of TiO2 semiconductor as photocatalyst. Heterogeneous photocatalysts using Iron as a dopant metal, so far, have been reported for various environmental applications. This paper highlights the recent advances and applications of Fe-TiO2 photocatalysis for the degradati...

In the present research, the titanium-catalyzed ethylene dimerization and more specifically, the concomitant byproducts and polymer formation have been studied in the presence of 2,5-dimethoxytetrahydrofuran as an electron donor compound in the combination with triethylaluminium (TEA) as activator. Then, we added ethylene chlorobromide as a new efficient promoter to the relevant catalyst system...

An elementary step towards a quantitative assessment of the risks of new compounds to the environment is to calculate their predicted environmental concentrations (PEC). The aim of this study was to use a life-cycle perspective to model the quantities of engineered nanoparticles released into the environment. The quantification was based on a substance flow analysis from products to air, soil a...

The Electrosynthesis of Organic Compounds Measurement of Electrodeposit Thickness Electron Concentration as a Guide to Alloying Behaviour A Rhodium-Platinum Probe for Flame Velocity Measurement Ruthenium-Platinum Oxide Catalysts for Hydrogenation Reactions Complexes of Substituted Olefins with Salts of the Platinum Metals Making Corrosion-Resistant Brazed Joints in Stainless Steel Thermocouples...

Black mineral sands are widely used to obtain titanium dioxide, titanium, and, more recently, a variety of iron–titanium oxide nanostructures. Highly corrosive acids or alkalis commonly employed for this purpose. Hence, it is desirable find eco-friendly ways process these minerals, deriving high-added value materials. In study, an Ecuadorian sand precursor (0.6FeTiO3?0.4Fe2O3 solid solution) wa...