Copper Dissolution from Black Copper Ore under Oxidizing and Reducing Conditions

Dissolution of biogenic and synthetic UO2 under varied reducing conditions.

The chemical stability of biogenic UO2, a nanoparticulate product of environmental bioremediation, may be impacted by the particles' surface free energy, structural defects, and compositional variability in analogy to abiotic UO(2+x) (0 < or = x < or = 0.25). This study quantifies and compares intrinsic solubility and dissolution rate constants of biogenic nano-UO2 and synthetic bulk UO2.00, ta...

Preparation of Copper (Cu) and Copper Oxide (Cu2O) Nanoparticles under Supercritical Conditions

Temperature and pressure, both of which can affect the supersaturation and nucleation are responsible for solvents properties. In this study, we use water as solvent under supercritical conditions and report copper (Cu) and (Cu2O) nanoparticles of size ranging from 9 nm to 60 nms. This synthetic technique has the following advantages: Firstly, it is one step synthesis approach, making it easy t...

Methanobactin, a copper-acquisition compound from methane-oxidizing bacteria.

Siderophores are extracellular iron-binding compounds that mediate iron transport into many cells. We present evidence of analogous molecules for copper transport from methane-oxidizing bacteria, represented here by a small fluorescent chromopeptide (C45N12O14H62Cu, 1216 daltons) produced by Methylosinus trichosporium OB3b. The crystal structure of this compound, methanobactin, was resolved to ...

Influence of Oxidizing and Reducing Pre-treatments on the Internal Friction of Electron Irradiated Copper

The influence of oxidizing and reducing anneals on the internal friction in the Hz-range has been investigated for coldworked and electron irradiated copper. The effects are compared and discussed with respect to the atomistic mechanisms.

Bioleaching of Copper from Low-Grade Ore Using Isolated Bacteria and Defined Mixed Cultures