Oil-impregnated paper is widely used in power transmission equipment as a reliable insulation. However, copper sulphide deposition on oil-paper insulation can lead to insulation failures in power transformers. This paper presents the influences of copper sulfur corrosion and copper sulphide deposition on copper wires and oil-paper insulation in power transformers. Thermal aging tests of paper-w...

The solvothermal in situ double cycloaddition reaction of 2-cyanopyrimidine, Cu(2)O and NaN(3) with aqueous ammonia additive generated a two dimensional copper(I) coordination polymer with 5-pyrimidyl-tetrazolate, 3,5-bispyrimidyl-1,2,4-triazolate and the cyano group as the ligands. This reaction can be tuned to yield two dimensional coordination polymers solely based on tetrazolate or 1,2,4-tr...

The main insulation system in high-voltage direct current (HVDC) transformer consists of oil-paper insulation. The formation of space charge in insulation paper is crucial for the dielectric strength. Unfortunately, space charge behavior changes because of the corrosive sulfur substance in oil. This paper presents the space charge behavior in insulation paper induced by copper sulfide generated...

in this study, effects of solid concentration, temperature, and initial fe2+ concentration on bioleaching of sulfide mineral (chalcopyrite) obtained from sarcheshmeh copper mine in the region of kerman located in the south of iran were investigated. a mesophilic iron oxidizing bacterium, acidithiobacillus ferrooxidans has been isolated from a typical chalcopyrite copper concentrate of the menti...

Metal organic frameworks (MOFs) of copper and zinc synthesized with 1,4benzenedicarboxylic acid and N,N-dimethylformamide at room temperature and by solvothermal method is reported in this paper. The MOFs were characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), High resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and...

Two strains of Rhodotorula and one of Trichosporon precipitated dissolved copper with H(2)S formed by reducing elemental sulfur with glucose. Iron stimulated this activity under certain conditions. In the case of Rhodotorula strain L, iron stimulated copper precipitation aerobically at a copper concentration of 18 but not 180 mug/ml. Anaerobically, the L strain required iron for precipitation o...

Lysine-2,3-aminomutase from Clostridium SB4 contains iron and sulfide in equimolar amounts, as well as cobalt, zinc, and copper. The iron and sulfide apparently constitute an Fe-S cluster that is required as a cofactor of the enzyme. Although no B12 derivative can be detected, enzyme-bound cobalt is a cofactor; however, the zinc and copper bound to the enzyme do not appear to play a role in its...

Palladium-copper alloys continue to be of interest for hydrogen membrane applications because of their high catalytic activity for hydrogen dissociation, high hydrogen permeability, robustness, and degradation resistance in the presence of sulfur-containing compounds. This sulfur tolerance makes these alloys attractive for membrane applications where sulfur compounds are likely to be present, s...

Monte Carlo simulations using crystal chemical constraints have been used to elucidate the copper diffusion mechanisms in copper-doped zinc sulfide. Relaxation around the ZnSuCu S interface allows facile copper diffusion, particularly in the 22x presence of substitutional oxygen or sulfur vacancies. Copper diffusion is responsible for the brightness degradation in this electroluminescent materi...